iGUARD
Digital Generator Set Controller
Installation and Operations Manual
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Section 75
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our
specifications and designs at any time. The latest version of this manual can be found at www.fwmurphy.com.
Please read the following information before installing.
BEFORE BEGINNING INSTALLATION OF THIS MURPHY
PRODUCT:

Disconnect all electrical power to the machine.

Make sure the machine cannot operate during installation.

Follow all safety warnings of the machine manufacturer.

Read and follow all installation instructions.

Please contact FW MURPHY immediately if you have any
questions.
Table of Contents
Introduction ............................................................................................................................. 1 Product Description ......................................................................................................1 User Interface and Navigation ......................................................................................1 iGUARD Operating Instructions ............................................................................................ 3 Operating Sequence ....................................................................................................3 Programming the iGUARD from the Keypad ................................................................5 Settings and Definitions ......................................................................................................... 8 Operating Parameters ..................................................................................................8 Communication Parameters .......................................................................................12 Miscellaneous Parameters .........................................................................................13 Engine Parameters ....................................................................................................16 Generator Parameters ...............................................................................................18 Digital Inputs and/or Relay Outputs ............................................................................21 Analog Inputs ........................................................................................................................ 30 Manufacturers Specifics ...................................................................................................... 36 iGUARD Typical Installation and Mounting ....................................................................... 38 iGUARD Electrical Installation ............................................................................................. 41 Electrical Hook up ......................................................................................................41 Energy Monitoring Board (EMB) ................................................................................45 Installing the Mimic/Annunciator DM/A .............................................................................. 50 DM/A Mimic/Annunciator Versions .............................................................................50 Specifications ........................................................................................................................ 58 Standard Components ...............................................................................................58 iGUARD Options and Accessories ..................................................................................... 59 (THIS PAGE INTENTIONALLY LEFT BLANK)
Introduction
This document is designed to support a user in getting familiar with the iGUARD Digital
Generator Set Controller and how to navigate the interface, modify the settings and install and
operate the controller. Before attempting to set up the controller, be sure to read and
understand this manual in its entirety.
Product Description
Description
The iGUARD controller is a high performance, state of the art, digital generator set controller.
This robust controller features high-speed microprocessors, and high accuracy AC
measurements. The iGUARD is a menu driven system, organized by "stacks", with "substacks" where required. User connections are made via the plug in connectors on the rear of
the controller. The iGUARD controller has a textured finish; UV stabilized polycarbonate
injection molded housing, and is sealed with an “o” ring to help protect the iGUARD from the
environment. There is a back cover protecting the Energy monitoring Board (EMB) to prevent
contact with circuit board components and potentially harmful AC voltage wiring.
User Interface and Navigation
The keypad on the iGUARD is a capacitive touch sensing system. There are no mechanical
switches to wear or stick, and the technology has been time proven in many applications. It
operates in extreme temperatures, with gloves, through ice, snow, mud, grease, etc., and it
allows complete sealing of the front of the iGUARD. It does operate slightly differently than a
membrane keypad, in that there is no tactile feedback. The ‘key is pressed’ feedback is
provided by momentarily beeping the audible alarm. The keys on the keypad do the following
functions:
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START
In Manual mode pressing the start pad will cause
the engine to start. In automatic mode the screen
will display an error message that system must be
in manual mode to start with the start button.
STOP
In automatic or manual mode pressing the stop pad
will stop the set. The system is forced into a
manual mode, and will not autostart until returned
to automatic mode.
Auto/Manual
Selects manual (sometimes-called local) operation
or automatic mode (system monitors a digital input
for a start signal).
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Acknowledge/Alarm
For warnings that do not cause a shutdown,
pressing this pad will clear the alarms active at that
moment. If the conditions subsequently clear and
re-occur or if additional warnings occur, the
common alarm output will come back on.
Up / Down Arrows
In program mode scrolls the menu selections and
also scrolls through the choices for a given
parameter.
Left / Right Arrows
In normal operation steps forward/backward
through the screens available in the active
submenu
Next
In normal operation steps forward through the main
menu selection
Back
In normal operation steps backward through the
main menu selections.
Enter
In program mode, pressing Enter will allow a
variable to be changed, and then pressing Enter
again will accept the displayed /new value.
Exit
In normal operation returns the system to the main
(default) screen. In program mode cancels any
changes made unless the "Enter" pad has already
been pressed.
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iGUARD Operating Instructions
Operating Sequence
The iGUARD controller, while reprogrammable, follows a standard operating sequence. This
operating sequence is basically a set of machine states that happen in a pre-determined order.
Machine states can be set to zero if not needed, or adjusted to fit the application. For the basic
operating sequence, see the iGUARD Sequence Appendix in the Installing the
Mimic/Annunciator DM/A section, this document. The iGUARD operating sequence includes
the following modes:
Ready to Start Mode
Automatic start mode ready for a contact closure to initiate an
automatic start and run sequence.
Prestart Delay Mode
A timer used to prevent nuisance starts, or to warn nearby
personnel that automatic equipment is about to start (set to 0
to bypass).
Prelube Mode
In larger generators there may be a requirement for
automatic lubrication prior to cranking (set to 0 to bypass).
Preheat
Timer set to provide the correct amount of precrank operation
of the air intake heaters used to facilitate starting in cold
conditions. (Set to 0 to bypass).
Cranking / Crank Rest Mode
Engine is attempting to start and will go through the number
of selected starting attempts.
Crank Disconnect / Engine
Running Mode
Engine speed is greater than the crank disconnect.
Warmup Mode
Timer to allow system to run unloaded for selected time (set
to 0 to bypass).
At Load Mode
Generator is running at load.
Power Good Mode
This mode is to prevent nuisance start/stops. The controller
continues running but monitors the remote start contact while
in this mode. The power good timer must expire before the
system can proceed to cooldown. Any further call to run
resets the power good mode timer to its preset value.
Cooldown Mode
Generator runs unloaded for a preset time.
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Energized to Stop
The Energized to Stop timer is ON and the Energized to Stop
output is active.
Stopped Mode
Generator has come to a complete stop.
Postlube Mode
In larger generators there may be a requirement for
automatic lubrication after a normal start/run/stop cycle
before the engine can be restarted (set to 0 to bypass). After
postlube, the system returns to Ready to start. Additionally
there are two fault shutdown modes:

Shutdown / Lockout with Cooldown Mode - In
the case of some faults the controller will open the
"at load’ contact and then go through a normal
cooldown and stop sequence, but will not allow an
automatic restart without a system reset.

Immediate Shutdown/Lockout (no Cooldown)
Mode - Because of the severity of most faults, the
controller will cause an immediate
Shutdown/Lockout without a cooldown period, and
will not allow an automatic restart without a system
reset.
Shutdown / Lockout with
Cooldown Mode
In the case of some faults the controller will open the "at
load’ contact and then go through a normal cooldown and
stop sequence, but will not allow an automatic restart without
a system reset
Immediate
Shutdown/Lockout (no
Cooldown) Mode
Because of the severity of most faults, the controller will
cause an immediate Shutdown/Lockout without a cooldown
period, and will not allow an automatic restart without a
system reset.
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Programming the iGUARD from the Keypad
The iGUARD controller can be programmed in two separate ways. Most setup can be done
from the front panel. There are some parameters, such as changing passwords that require
the use of the iGCON software tool. The iGUARD programming menus can be accessed at
any time by pressing the left and right arrows at the same time. This will bring up the password
menu:
The factory defaults (and what they allow access to) for the various levels of password are:
Access Security - Allows input of 4-character security code.

PASØ - No operational Access. It allows viewing of the data screens but
parameters cannot be edited.

PAS1 - Operational Access. It allows Manual Start and Stop but parameters
cannot be edited.

PAS2 - Parameter View Access. Allows for viewing of all parameters and
editing of the following parameter settings:

 Change Language
 Key Sensitivity Level
 Back Light On/Off
 Ack Maintenance Timers
 Enable Beeper
 Select Pressure Units
 Select Temperature Units
 Modify Date
 Edit Clock Start and Stop Timers
PAS3 - Parameter Edit Access. Allows for viewing and parameter editing
but does not allow calibration of AC.

PAS4 - Calibration Access. Allows calibration of the AC parameters.

PAS5 - kW Limit Edit and Config Select Access. Allows editing of kW limits
and various communication addresses.
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What to do if you lose your Password
Press NEXT until you see the screen with a graphic display of the Murphy logo. Press NEXT
once to go to the system information screen.
Write down the serial number, the current date, and time showing on the real time clock
display, and contact us (918) 317-4100, ask for technical support). We will provide a temporary
password that will allow you to access the system to recover the passwords.
Acknowledging Maintenance Timers
Status/ Warning Screen - You may see this warning/status message:
This is information that one or more of your maintenance reminder timers has expired. To
acknowledge the warning and reset the timer, enter the programming mode, and go to the
Miscellaneous Parameters screen.
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Press Enter and the screen should change to this display with the number quantity flashing:
Press the right arrow to reset and the display should change to:
Each timer can be acknowledged as it expires, or whenever the maintenance is done, if it
precedes the timer reaching 0.
Displaying Data
Use the Auto scroll function.
To turn the Auto scroll function ON, press the ENTER and NEXT keys at the same time. There
are three Auto scrolling speeds temporarily displayed on the top line each time ENTER and
NEXT keys are pressed (4 seconds, 8 seconds, 12 seconds). To select a different speed,
simultaneously press the ENTER and NEXT keys again to go to the next speed section. To
turn off the Auto scroll function press the EXIT and NEXT keys at the same time. If the
iGUARD is left on a non-scroll screen (like the Warnings/status screen) it will display only the
Warning/status screen.
When Programming
Touching the left arrow takes you immediately to the “TOP” of the program selection list.
The right arrow takes you immediately to the “BOTTOM” of the selection list.
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Settings and Definitions
Operating Parameters
To bring up the iGUARD Programming Screen, press the Left and Right arrow keys
simultaneously. After gaining access to this screen, you can use the Left, Right, Up and Down
keys to navigate from column to column and to adjust the values or change characters
displayed. Press Enter when password is correct.
The security level is shown on the bottom of the display. Press Exit to bring up the Parameters
screen.
1. Access Security - Allows input of 4-character security code.

Level - No operational Access. It allows viewing of the data screens but
parameters cannot be viewed or edited.

Level 1 - Operational Access. It allows Manual Start and Stop but
parameters cannot be viewed or edited.

Level 2 - Parameter View Access. Allows for viewing of all parameters and
editing of the following parameter settings:
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
Change Language

Key Sensitivity Level

Back Light On/Off

Ack Maintenance Timers

Enable Beeper

Select Pressure Units

Select Temperature Units

Select Temperature Units

Date Display Format

Modify Date

Edit Clock Start and Stop Timers
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
Level 3 - Parameter Edit Access. Allows for viewing and parameter editing
but does not allow calibration of AC.

Level 4 - Calibration Access. Allows calibration of AC parameters.

Level 5 - kW Limit Edit and Config Select Access. Allows editing of kW
limits and various communication addresses.
2. Language - Allows selection of language used to display text.
a. English (Default)
b. Spanish
c. etc. (future expansion)
3. Driven Equipment Type - Allows selection of type of equipment that is driven by the
engine.
a. None (engine only, ignores all AC parameters)
b. AC Alternator (Genset) (Default)
4. Key Sensitivity Level - Determines how sensitive the touch pad keys are for your
application.
a. Low*
b. Normal (Default)
c. High
5. Default Screen - When the system is running this selects the screen that will show.
 Event History
 Warnings / Status
 Engine / Gen Status
 Meters
 Nominal Meter
 Splash Screen
 Information

NOTE: * Newer versions of the controller/software will not have a “LOW”
sensitive selection.
6. Lamp Test - Tests LCD.
7. LCD Backlight - Turns the iGUARD display backlight off, unless an error condition
activates the common visual alarm.
a. Disabled
b. Enabled (Default)
8. Guard Beeper - Keypress indication and/or audible warning buzzer.
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a. Disabled
b. Enabled - Beeps with each keypress, sounds for errors. (Default).
9. Pressure Units - User selection of display units.
a. PSI (Default)
b. kPa
c. bar
10. Temperature Units - User selection of display units.
a. Fahrenheit (Default)
b. Celsius
11. Date Display - Format Selectable.
a. American Style (Default)
b. European Style
12. Event Types to record.
a. All events (Default)
b. Shutdown events only
13. Clear Event History - Erases all stored history events.
14. Standby Mode Timer - When the timer expires, the system goes into a lower power
standby mode. After it times out the LCD screen changes to a text message, the blue LCD
backlight is turned off, and the Energy Monitoring board is de-powered. Any keypress or a
remote call to run wakes the unit up. Value can be set between 30 seconds and 59 minutes 30
seconds or can be set to OFF.
15. Run to Destruct - When run to destruct is enabled, the system will only sound alarms for
errors, instead of shutting down. Since this could lead to the destruction of the equipment or
the load, there is both a menu selection and a jumper that must be physically cut (see
schematic diagram), making this a deliberate choice.
a. Disabled (Default)
b. Enabled
16. Edit Time and Date - Allows user to
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adjust
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time and date of iGUARD.
17. Input - Output Test - Shows the status of the analog inputs, digital inputs, and relay
outputs.
a. The analog input screen shows any change in the inputs. For example
if the resistance value of a resistive sender changes, the counts will
change.
i.
Analog channel number
ii.
Name/setup label
iii.
Actual value
b. The digital input screen shows the status of the digital inputs.
i. Digital Input Number
ii.
Name/setup label
iii.
Made/open
c. Relay output status allows the forcing of any relay out. The screen
shows:
i. Relay output number
ii.
Name/setup label
iii.
State
NOTE: Analog values, digital input, and relay status may be read on these
screens at any time. The relays may only be forced in “Manual Mode”
while not running.
18. Reset Configuration - Allows user to force a complete reset to a known state and clears
all programming and customization.
19. Operation Mode
a. Manual, Auto, NFPA - If not in Auto, you’ll get Not-In-Auto alarm.
b. Manual, Auto No Warning - It disables the Not-In-Auto alarm.
c. Manual Mode Only - Can only be started from the front keypad.
20. Duplicate Senders - Allows ‘one only’ or more than one sender for engine pressures
and temperatures.
21. Repeater #1 (set to Mimic as Default)
a. Set as Mimic Allows control capabilities without programming.
b. Set as Annunciator Allows viewing without control.
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22. Repeater #2 (set to Mimic as Default)
a. Set as Mimic Allows control capabilities without programming.
b. Set as Annunciator Allows viewing without control.
23. Winter/Summer Setpoint
a. Set Below Setpoint - If temperature is below setpoint, during start up,
automatic pre-heating begins.
b. Set Above Setpoint – If temperature is above setpoint, during start up,
pre-heating is bypassed.
Communication Parameters
1. J2 Protocol type - Selects the function that the selectable comm. port (on J2) will perform
a. RS-232 iGUARD config
b. RS-485 Modbus server
2. Modbus Server (SLAVE)” address - Sets the address of the Modbus server (247 is
default)
3. RS-485 Server (SLAVE) bit frame - Sets the number of start, data & stop bits for serial
communications via RS-485 Modbus
a. 10 bits N-8-1
b. 11 bits N-8-2
4. Server (SLAVE) Baud Rate - sets the number of start, data & stop bits for serial
communications via RS-485 Modbus
a. 9600
b. 19200
c. 38400 (Default)
5. RS-485 Client (MASTER)” bit frame - sets the number of start, data & stop bits for serial
communications via RS-485 Modbus
a. 10 bits N-8-1
b. 11 bits N-8-2
6. Client (MASTER)” Baud Rate – communication speed on the RS-485 Client (Master) port
a. 9600
b. 19200
c. 38400 (Default)
NOTE: Be aware that when using the iGUARD to drive PowerView analog
gages or the Remote I/O board, those devices only operate at 38400
baud.
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7. Modem Connection - Sets the com port for RS-232 based modem communications
a. Enabled
b. Disabled (Default)
Miscellaneous Parameters
Review the materials supplied with the engine/ECU by the manufacturer to become familiar
with the specifics of your engine.
1. Engine ECU Type - Selects which ECU communications interface will be used to provide
engine parameters.
a. None (mechanically governed/controlled engine) (Default)
b. J1939
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2. Crank Cut Type - Selects the primary crank and the secondary crank cuts. The options are
as follows:
Primary
Secondary
J1939
MPU
J1939
AC Freq
J1939
Digit input
J1939
None
MPU
J1939
MPU
AC Freq
MPU
Digit input
MPU
None
AC Freq
J1939
AC Freq
MPU
AC Freq
Digit input
AC Freq
None
3. ECU Address Claim
a. None Required
b. Single ECU
c. Multiple ECU’s
4. Engine Manufacturer - Selects engine manufacturer.
Manufacturer
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Manufacturer
a
Caterpillar
i
Isuzu
b
Cummins
j
Kubota
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c
Deere
k
Lister-Petter
d
Detroit
l
Mercedes
e
Deutz
m
Perkins
f
Ford
n
Volvo
g
GM
o
Other (Default)
h
Hatz
NOTE:
Caterpillar, Cummins, Deere, Detroit, Deutz, Ford, GM, Hatz, Isuzu,
Kubota, Lister-Petter, Mercedes, Perkins, Volvo are registered trademarks of
their respective corporations
5. J1939 Crankcut Count - Is the number of consecutive measurements of the RPM above
the Crankcut RPM, required to achieve crank disconnect.
6. Fuel Level Source - Select level source.
a. None (Default)
b. J1939
c. Analog Input
7. Oil Life - Sets service interval timer for end user maintenance reminder. (Default 100
hours)
8. Oil Filter Life - Sets service interval timer for end user maintenance reminder. (Default 100
hours)
9. Belt Life - Sets service interval timer for end user maintenance reminder. (Default 100
hours)
10. Battery Life - Sets service interval timer for end user maintenance reminder. (Default 100
hours)
11. Fuel Filter Life - Sets service interval timer for end user maintenance reminder. (Default
100 hours)
12. Air Filter Life - Sets service interval timer for end user maintenance reminder. (Default
100 hours)
13. Overhaul Life - Sets service interval timer for end user maintenance reminder. (Default
1000 x 10 hours)
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Engine Parameters
1. Pre-Autostart Delay - When system is in automatic mode, sets how long unit waits after a
remote run signal is active before proceeding with automatic start sequence. (Default 5
seconds, set to zero to bypass.)
2. Pre-Heat Type - Determines how long the preheat output is active.
a.
b.
c.
d.
e.
None - No preheat. (Default)
Pre-Crank - For strictly the preheat timer length.
Crank Through - Preheat for the preheat timer + crank time.
Bypass Timer - Preheat + crank + start up lockout bypass.
Warm-Up - Preheat + crank + start up lockout bypass + warmup.
3. Pre-Lube Time - Amount of time a prelube output stays on prior to allowing a start. (Default
ø sec.)
4. Pre-Heat Timer - Amount of time that an engine is preheated prior to cranking. (Default ø
sec.)
5. Purge Crank Time - In gaseous-fueled engine applications, a purge crank is used to
prevent gas build up and vent any accumulated gaseous fuel from the system so that it will
start with a known condition. The engine cranks for a pre-settable time with the fuel output deenergized. (Default ø sec.)
6. Crank Time - In an automatic crank cycle the longest time that the engine cranking motor
can be energized. (Default is 15 sec.)
7. Crank Rest Time - In an automatic crank cycle, the time that the engine cranking motor is
off between crank attempts. (Default 15 sec.)
8. Start Attempts - The maximum number of times that the engine cranking motor is
energized without a successful engine start. (Default 3 cycles)
9. Startup Bypass Time - Temporarily disables the low engine oil pressure, high engine
temperature and various other shutdown faults until the engine can come to a running
condition. (Default 15 sec.)
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10. Warm-Up Load Delay - How long the engine /generator will run before it closes the "AT
LOAD" contacts. (Default ø sec.)
11. Nominal RPM - Nominal operating RPM (1800 RPM for 60 Hz, 1500 RPM for 50 Hz).
(Default 1800)
12. Engine Overspeed - Engine overspeed setpoint. (Default 1980 RPM [110%])
13. Engine Underspeed - Engine underspeed setpoint. (Default 1620 RPM [90%])
14. Engine Cooldown - How long engine will run after the remote run demand is removed.
There are some Generator faults that will also go through a normal cooldown and proceed to
lockout. (Default ø min.)
15. Post-Lube Time - Length of time after the genset has completed a normal run that any
post-run lubrication system is to be activated. Set will not restart until timer expires. (Default is
0 sec.)
16. Flywheel Tooth Count - Number of Flywheel teeth. (Default 168)
17. Crank Termination RPM - Speed to stop cranking the engine. Also considered the
minimum engine run speed. (Default 600 RPM)
18. Oil Pressure Warning - Oil pressure at which the controller activates a warning
indication. (Default 25 PSI)
19. Oil Pressure Shutdown - Oil pressure at which the controller shuts down the system due
to low oil pressure. (Default 20 PSI)
20. High oil temperature warning - Oil temperature at which the controller will activate a high
oil temperature warning alarm. (Default 245°F)
21. High oil temperature shutdown - Oil temperature at which the controller shuts down the
system due to high oil temperature. (Default 250°F)
22. Low Eng. Temp. Warning - Coolant temperature at which the controller will activate a low
temperature warning alarm. (Default 70°F)
23. High Eng. Temp. Warning - Coolant temperature at which the controller activates a
warning indication. (Default 215°F)
24. High Eng. Temp. Shutdown - Coolant temperature at which the controller shuts down the
system due to high temperature. (Default 220°F)
25. Battery Weak - Voltage setpoint for average battery voltage during cranking. Battery
voltage that falls below this setpoint usually indicates either a bad battery or bad connections.
(Default 8 VDC)
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26. Battery Low Warning - Low battery voltage setpoint. Voltage equal to or less than this
setpoint in normal (non-cranking) operation indicates battery needs charging. (Default 11.5 V)
27. Battery High Warning - Battery voltage equal to or greater than this indicates
overcharging of battery. (Default 14 V)
28. Fuel Low Warning - Fuel level warning setpoint. (Default is 35%)
29. Fuel Low Shutdown - System shuts down when fuel level reaches this amount. (Default
5%)
30. Energize to stop - In systems that require an energize-to-stop signal, this controls how
long the stop output is on. (Default is 0 sec)
31. RPM per Hertz - In systems with no magnetic pick up, engine RPM is a fixed constant,
based on the AC frequency, allowing an RPM display. (Default is 30)
Generator Parameters
1. Crank Termination AC - When using the AC frequency for a speed source, this is the
equivalent to crank termination RPM. (Default 20 Hz)
2. AC Speed Signal Delay - Delay to allow excitation of the alternator. (Default 3 sec.)
3. Power Good Timer - A timer to avoid nuisance start/stop cycles. At the end of a normal
automatic cycle, when the remote start signal is no longer active, this timer must expire before
the system will proceed to cooldown. (Default ø sec.)
4. CT Ratio - Current transformer ratio (xxx:5). (Default is 300:5) The iGUARD uses standard
5A output CT’s.
5. Load Bypass Timer - Timer for bypass of load related alarms to allow load stabilization.
(Default 5 sec.)
6. Calibration Voltage - Allows field recalibration of AC voltage inputs. AC voltages here are
always measured Line to Neutral, even if the normal display is set for line to line.
7. Calibration Current - Allows field recalibration of AC current inputs.
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8. Grounded CT’s - The energy monitoring board allows termination of the CT’s in two
ways. The CT’s may be wired with both leads from each CT brought back to the EMB, or by
bringing one lead from each CT, tying the other leads together, and grounding them. This is
called grounded or commoned CT’s. If your installation can bring all six leads back to the
EMB, that is the method that we recommend. If the application can’t, and the CT’s have
one lead from each CT all tied together, then this selection needs to be set to "YES".
a. No (Default)
b. Yes
9. Nominal Voltage Source - Allows selection of display voltage as line-to-line or line to
neutral.
a. Line - Line (Default)
b. Line - Neutral
10. Indicate Reverse Power - Allows user to mask CT orientation alarms by disabling reverse
power/current indication
a. Yes (Default)
b. No
11. Phase Selection - Common generator configurations.
a. 3Ph High Wye
b. 3Ph Low Wye
c. 3Ph Wye (Default)
d. 3Ph Delta
e. Center Tap Delta
f. Single Phase
There are a number of ways to connect AC to the iGUARD. It is important to understand the
options and their meaning.
In the case of alternators that can be reconnected, the AC voltage and current are measured
at the non-neutral junction of the coils, and if “3ph high wye” is selected the coils are
connected in series. The actual output voltage will be 480 VAC, but the voltage measured at
the coil junction will be 240 VAC. The reading must be multiplied by 2 to display the output
voltage correctly.
In the case of a “3ph low wye”, the AC voltage and current are still measured at the nonneutral junction of the coils, but the coils are arranged in parallel. The AC voltage output is 240
VAC but, the current is twice the reading from the CT.
When using a non-reconnectable alternator or the application doesn’t include a voltage
output select switch, “3ph wye” displays output voltage and output current directly (default
setting).
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When using a Center Tapped Delta (3-phase output is 240VL-L, but L-N is 120,208,120L1, L2,
and L3 respectively) this is the setup to select. Single phase (two lines and a neutral) of any
configuration.
12. Generator Over Freq -Over-frequency shutdown setpoint. (Default is 65 Hz)
13. Generator Under Freq - Under-frequency shutdown setpoint. (Default is 55 Hz)
14. Nominal Voltage - "OK" voltage as measured at the "Nominal Voltage source". (Default is
480VAC)
15. Over-Voltage Trip - Over voltage shutdown setpoint. (Default is 110%)
16. Under-Voltage Trip - Under-voltage shutdown setpoint. (Default is 90%)
17. Power Factor Limit - Maximum limit for power factor. Will shutdown generator if setpoint
is exceeded. (Default .8 set to OFF to bypass)
18. IDMT Curve- Thermal protection for AC Alternator Off (Default) inverse; very inverse;
extremely inverse; long time inverse.
19. IDMT Pickup Current -Current setpoints for Thermal Protection to start (Default is 300A)
20. Maximum Inst. Over-Current - Over-current shutdown setpoint. (Default is 300A)
Instantaneous
21. PT Ratio -In system with L-L voltages > 600V, Potential transformers must be used to
prevent voltages greater than design from being applied to the energy monitoring board.
(xxx:1) 4200V:120V = 35:1 ratio, 480:240=2 ETC. (Default is 1.00:1)
22. kVA Limit -Limits kVA output of generator. Requires a level 5 password. (Default is 200
kVA.)
23. Over freq. Warn time - Delay timer before system shuts down on over frequency (Default
is 3 sec)
24. Over voltage warn time - Delay timer before system shuts down on over voltage. (Default
is 3 sec)
25. UF, UV, OC warn time - Delay timer before system shuts down on Under Frequency,
Under Voltage or Over Current. (Default is 3 sec)
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Digital Inputs and/or Relay Outputs
When wired to control the voltage regulator and the warmup speed, the Run/Idle switch input
(or the warmup timer) essentially inhibits AC speed detection in the idle and/or warmup mode.
NFPA-110 requires a secondary speed signal source to prevent crank re-engagement. If the
iGUARD is being used in an NFPA-110 / 99 application, and there is a low speed warmup/idle
required, the AC frequency cannot be used as a primary nor secondary speed signal source.
As this implies, there are no AC frequency or voltage based alarms or shutdowns available
during the low speed idle or warmup period. Since NFPA applications assume that there is no
warmup period (the requirement for a minimum - and therefore externally maintained jacket
coolant temperature) this should pose no problem for NFPA-110/NFPA-99 applications, unless
the application is in some way special, or the local inspector is making exceptions based on
intended use, or some other special circumstance.
The speed signals can come from the ECU, a magnetic pickup, or a separate speed switch
type device. When using a low speed idle (a run/idle switch input) for warmup in non-NFPA
applications, there are no special requirements for a secondary speed signal source.
When using a low speed idle (a run/idle switch input) for warmup in non-NFPA applications,
there are no special requirements for a secondary speed signal source.
Input Parameters - (Defaults Shown)

Digital Input 1 - Engine Overspeed.

Digital Input 2 - Crank Termination.

Digital Input 3 - User Input 1.

Digital Input 4 - User Input 2.

Digital Input 5 - User Input 3.

Digital Input 6 - User Input 4.

Digital Input 7 - User Input 5.
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
Digital Input 8 - User Input 6.

Digital Input 9 - Remote Call to Run. (Transfer switch input)

Digital Input 10 - Low Lubrication Oil Level.

Digital Input 11- Low Coolant Level.

Digital Input 12 - Low Fuel Level Warning.

Digital Input 13 - Fuel Leak.

Digital Input 14 - Battery Charger AC Fail.

Digital Input 15 - Emergency Stop N/O.

Digital Input 16 - Air Damper Closed.

Digital Input 17 - Generator Config 1.

Digital Input 18 - Generator Config 2.

Digital Input 19 - Generator Config 3.

Digital Input 20 - Generator Config 4.

Digital Input 21 - Generator Config 5.

Digital Input 22 - Generator Config 6.

Digital Input 23 - Fuel Filter Restriction.

Digital Input 24 - Air Filter Restriction.
Menu Selections for Digital Inputs
1. Disabled - Not used
2. Remote Call to Run - In automatic mode, when this input is grounded, the system will
initiate an automatic start sequence.
3. Remote Alarm Acknowledge - When grounded will acknowledge (silence) remote audible
alarms.
4. Engine Overspeed - When grounded, initiates an immediate shutdown and lockout and
displays "Engine overspeed" as cause of shutdown.
5. Crank Termination - When active will cause immediate cessation of cranking, and no
cranking can occur while this input is active.
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6. Low Fuel Level (warning) - When active, system indicates "low fuel level" alarm and closes
the alarm contacts, but does not shutdown.
7. Fuel Leak - When active, indicates a fuel leak in the fuel containment basin, and causes an
immediate shutdown.
8. Fuel Filter Restriction - When active, indicates fuel filter restriction and will shutdown if
running or will not start.
9. Air Damper Closed - When active, indicates that the air shutdown damper is closed and
the system will not start. An input programmed for this function causes an immediate shutdown
if it becomes active when the system is running.
10. Air Filter Restriction - When active, indicates air filter restriction warning.
11. Low Lube Oil Level - Will cause immediate shutdown as well as inhibit starting when
active.
12. Battery Charger Fail - When active displays a warning.
13. Low Coolant Level - Will cause immediate shutdown as well as inhibit starting when
active.
14. Emergency Stop N/O - Grounding this input will cause an immediate shutdown and
lockout with a message of "Emergency Stop". System will not start until this is cleared.
15. Emergency Stop N/C - Removing ground from this input causes an immediate shutdown
and lockout with a message of "Emergency Stop". System will not start until this is cleared.
16. Oil Filter Restriction - When active, gives an oil filter flow is restricted warning.
17 - 22. Gen Config 1 - 6 - Used to set up the parameters for reconnectable gensets. There
are 6 genset profiles. If no profiles are selected, the controller will show profile #1 by default. If
more than one are selected the controller will show profile #1.
23 - 31. User 1 - 24 - There are up to 24 user-defined digital-inputs. Each can have a user
defined label that is displayed when active, and action that occurs when active. (Set up for
these inputs is done with the iGCON software tool).
32. Remote Auto/Manual Select - When Auto is active, it causes the unit to go into automatic
mode. When Manual is active, it causes the unit to go into manual mode.
33. Idle Engine - When active, it disables all shutdown faults except Overspeed/Over
frequency.
34. Remote Up Key - Functions the same as the front panel key, except using a digital input.
35. Remote Down Key - Functions the same as the front panel key, except using a digital
input.
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36. Remote Left Key - Functions the same as the front panel key, except using a digital input.
37. Remote Right Key - Functions the same as the front panel key, except using a digital
input.
38. Run To Destruct - When enabled (There is a hardware trace that must be cut to enable
this!) this causes the controller to ignore all shutdowns and continue to operate no matter what.
This is also sometimes called a “Battle Short” input.
39. Modbus Mode change OK - When using the Modbus server (slave) port, this allows a
remote user to change from AUTO to MANUAL and vice versa if it is active.
40. Disable Keyboard - When this input is active the front keyboard is totally locked out.
Generator Steering
In applications where there is a voltage reconnection switch for reconfiguring the alternator
from 480V 3 phase 4 wire to 240V 3phase 4 wire or 240V single phase 3 wire, the steering
inputs allow a means to track which configuration is currently selected. This is done by means
of selecting (grounding) the appropriate input via an auxiliary contact on the reconnection
switch. There are up to 6 selections available from the iGUARD controller. Each is fully
independent (except for the CT selection) from the others. Some 480/240V reconnectable
applications look like this schematic:
With the CT positioned on the coil winding just prior to the electrical connection of T7/T1,
T8/T2, and T9/T3 and voltage connections tied to the top of T7, T8, & T9 in both the high and
low voltage positions.
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The low wye will read full output voltage (L-N) and half of the current (per phase). The high
wye will read half of the output voltage (L-N) and full current (per phase).
The CT’s have to be sized to read the current in the high wye configuration (The current
through a conductor is identical throughout the conductor) – A series connection adds voltage
but not current, and the low wye configuration.
A lot of confusion occurs because switching from windings in parallel to windings in series (and
vice versa) basically means that the measurement points always see exactly the same current
and voltage, but the “output” current and voltage differ.
The simplest way to keep track of this is to remember that in series – The output voltages add
but currents remain the same, while in parallel, output currents add but the voltages remain the
same.
For example, assume that we are in a high wye configuration. If we are loaded such that the
coil T7-T10, T8-T11, and T9-T12 are all producing 50A, the measurement points will read
nominal 240V and 50 A, but the output connections as measured at T1, T2, & T3 will read
480V but still be 50 A - In a high wye the voltages add but the series coil currents remain the
same.
Now assume a low wye - If we are loaded such that the coil T7-T10, T8-T11, and T9-T12 are
all producing 50A, the measurement points will read nominal 240V and 50 A, but the output
connections as measured at T1, T2, & T3 will read 240V and the output current will be 100 A In a parallel connection the voltages stay the same, but the currents add.
In either case, note that at the measurement point the voltage is always 240V, and the
measured current is always 50A.
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A more easily understood method is to connect the iGUARD to the output terminals, with the
CTs sized for maximum current in the low wye configuration. This way, the controller can read
what is actually coming out of the generator, without any need to interpolate and assume. This
will offer increased accuracy, and is generally easier to understand.
Output Parameters
1. Relay 1 - Preheat.
2. Relay 2 - Crank.
3. Relay 3 - Fuel.
4. Relay 4 - Common Alarm.
5. Relay 5 - Common Alarm.
6. Relay 6 - Remote Alarm.
7. Relay 7 - Enable ECU.
8. Relay 8 - Not in Auto.
Output States
1. Not Used.
2. Preheat - Relay follows the selected preheat state.
3. Crank - Relay follows the crank setting.
4. Fuel - Relay operates as "Energized to run" suitable for fuel control.
5. Shutdown Lockout - Relay is active when system has shutdown on a fault and is
energized until reset.
6. At Load Contactor - Relay closes when controller goes to "AT LOAD".
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7. Shutdown - Activated only by a fault shutdown.
8. Common Alarm - Any warning or shutdown condition will activate the relay.
9. Remote Alarm - Any alarm condition will actuate this output; can be de-energized by an
ACK or by a reset condition.
10. Air Damper N/De-energized - Relay operates when system goes into overspeed or if
emergency shutdown is active.
11. Not in Auto - Relay operates when system is not in auto mode - Self-clearing. .
12. Low Oil Pressure Warning- Relay operates when the engine oil pressure is below the
warning setpoint - self-clearing.
13. Low Oil Pressure Shutdown - Relay operates when the engine oil pressure is below the
warning setpoint - requires reset to clear.
14. Low Eng. Temp. - Relay operates when the low coolant temperature is below the setpoint
- Self-clearing. Coolant temperature is below the setpoint - Self-clearing.
15. High Eng. Temp. Warning - Relay operates when the engine coolant temperature is above
the warning setpoint - self-clearing.
16. High Eng. Temp. Shutdown - Relay operates when the engine coolant temperature is
above the shutdown setpoint - Requires Reset to clear.
17. Over-Speed - Relay operates when engine speed exceeds the setpoint - Requires Reset
to clear.
18. Over Frequency - Relay operates when AC frequency exceeds the setpoint - Requires
Reset to clear.
19. Under Speed - Relay operates when the engine RPM falls below the setpoint - selfclearing.
20. Under Frequency - Relay operates when the AC frequency falls below the setpoint - selfclearing.
21. Low Battery - Relay operates when steady state DC voltage falls below the setpoint - Selfclearing.
22. Weak Battery - Relay operates when DC voltage during the crank cycle falls below the
setpoint - ACK or reset to clear.
23. High Battery - Relay operates when steady state DC voltage rises above the setpoint Self-clearing.
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24. Low AC Voltage - Relay operates when AC voltage falls below the setpoint - ACK or reset
to clear.
25. High AC Voltage - Relay operates when AC voltage rises above the setpoint - ACK or
reset to clear.
26. Over Current - Relay operates when AC current rises above the setpoint - ACK or reset to
clear.
27. PF Out of Range - Relay operates when the power factor is less than the setpoint.
28. kW Limit - Relay operates when the calculated kW is greater than the setpoint - ACK or
reset to clear.
29. Remote Contact 1 - 3 - When remote communications have been established, the remote
user can remotely actuate/deactuate the relays. Relays maintain their state until either the
remote user changes them again or the unit is reset.
30. Digital Input 1 - 24 - relays follow the input state of the respective digital input.
31. ECU Enable - Relay operates to enable the engine ECU. ECU enable will open during
STANDBY.
32. Prelube / Post Lube - Relay operates to activate for both, pre and post lube cycles.
33. Prelube - Relay operates to activate prelube cycle.
34. Post Lube - Relay operates to activate postlube cycle.
35. Prestart Delay - Delay to prevent nuisance starts or to give warning when equipment is
about to run.
36. Oil Level Low Warning - Relay operates when low oil level input active.
37. Coolant Level Low Warning - Relay operates when low coolant level input active.
38. Excite Engine Alternator - Relay output to activate engine alternator excitation.
39. Engine Running No Load - Relay output active when engine running without load.
40. Idle Engine - Relay active when idle engine digital input active.
41. Crank Retries Exceeded - Engine did not start within programmed number of tries. (Also
called ‘overcrank’)
42. Fuel N/C - Inverted logic from normal fuel relay operation
43. Running Warmup
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44. Running Cooldown
45. Air Damper N/Energized
46. Run to Destruct Enabled
47. Energized to Stop - Relay turns ON at shutdown and stays on for length of ETS timer.
48. Engine running - Engine speed is above crank disconnect speed
49. Battery Charger Fail
50. Oil Temp. High - Oil temperature is above warning setpoint.
51. Fuel Level Low Warning
52. Modem Power Enable - Used to turn modem on/off to force a known state
53. Running Warm-up and Cool-down - Reply turns on in both warm-up and cool-down
54. Not in Standby/Aux. Device
55. IDMT Warning (above pickup current)
56. IDMT Shutdown
57. Shunt Trip Alarm
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Analog Inputs
There are 7 analog inputs. The first four analog inputs can be used with both resistive senders
as well as 0-5VDC & 4-20mA devices, and the last three analog inputs are configured in such
way that they may only be used with 4-20mA or 0-5VDC type signals.
The iGUARD uses variable precision current sources to accommodate many different brands
of resistive senders as well as true detection of open/missing sender and sender shorted to
ground.
To use an analog input with a resistive sender, wire as follows:
To use an analog input with a 0-5 VDC signal source, wire as follows: To use an analog input
with a 4-20mA signal source and the built in 250Ω load resistor, wire as follows:
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Menu Selection for Analog Inputs
1
Disabled
15
VDO 7 Bar Oil Sender
2
4 - 20mA Oil Sender
16
VDO 5 Bar Oil Sender
3
0 - 5 VDC Oil Sender
17
Datcon Temp
4
4 - 20mA Temp Sender
18
Murphy Temp
5
0 - 5 VDC Temp Sender
19
VDO A Temp
6
4 - 20mA Fuel Sender
20
VDO B Temp
7
0 - 5 VDC Fuel Sender
21
BMI Temp
8
4 - 20mA Oil temperature
22
Datcon Fuel
9
0 - 5VDC Oil Temperature
23
Murphy Fuel
10
0 - 5VDC VDO Temp special (Optional
output board Required)
24
VDO Fuel
11
0 - 5VDC VDO Pressure special
(Optional output board Required)
25
Datcon Oil Temp
12
0 - 5VDC current
26
Murphy Oil Temp
13
Datcon Oil Sender
27
VDO A Oil Temp
14
Murphy Oil Sender
28
BMI Oil Temp
Clock Start/Stop Parameters
1. Press Enter to display the first start day and time screen. The default is OFF.
2. Press the Right and Left arrows to select a day of the week
3. Press the UP and DOWN arrows to select a time.
4. Press Enter to save.
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5. Use the Down Arrow to move to the First Stop day and time screen. The default is OFF.
Press the Right and Left arrows to select a day of the week.
6. Press the UP and DOWN arrows to select a time.
7. Press Enter to save. Repeat for start/stop times 2 and 3 if needed.
Alternate Signal Polarities for the Digital Inputs
Most applications will require that ground be applied as the signal that an input is active. The
standard iGUARD connection diagrams show this type of connection. However, some
applications either require or are much easier to implement using a positive +V battery signal
to indicate the input is active.
If terminal 9 is tied to the +V battery, applying ground to terminal 1 will activate the input
(DEFAULT METHOD). If terminal 9 is tied to ground, applying +V battery to terminal 1 will
activate the input.
Inputs 9 - 24 are ganged together. They have a common that may be tied high to give
‘ground active’ operation, or tied to ground to give ‘+V Battery active’ operation.
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Relay Functions Display
All relay functions that are active will be displayed on the screen. If a relay has been assigned
a function that is currently active, then that relay number will appear to the left of the active
relay function name.
Relay designation is displayed in sequence. For the first remote relay board, the relay
designation will be assigned in sequence starting at 101 up to 124 (example, Relay 1 is
displayed as 101, Relay 2 is displayed as 102 , etc.).
For the second remote relay board, the relay designation starts at 201 up to 224 (example,
Relay 1 is displayed as 201, Relay 2 is displayed as 202, etc.).
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Using iGUARD with ECU Controller Engines
In most Tier 2 compliant engines, the manufacturers have elected to move to electronic
controls to meet the exhaust emissions requirements mandated by the various air quality
boards. These controls allow for very precise control of the engine to limit emissions to the
legal level or below. One side effect is that there no need for the user to supply any senders
when using the iGUARD with a J1939 Engine Control Unit or Electronic Control Unit (ECU)
equipped engine, and that there is a large amount of useful data available from the engine
ECU.
In genset applications, the simplest implementation is to treat the engine ECU like a fuel
solenoid in a non-ECU equipped engine.
When there is a call to run:
1. The iGUARD closes the ECU enable relay, applying power or logic enable to the ECU.
2. The iGUARD waits a short time for the ECU to power up and stabilize.
3. The iGUARD communicates with the ECU to see if there are any "Wait to start" conditions,
such as:
a. Important variables not at their "ready to start values".
b. The ECU is sending out a Wait-to-Start message.
4. If there are no "Wait to start" conditions, the iGUARD begins a normal start cycle, or if there
are one or more "Wait to Start" signals, the iGUARD waits for them to clear before proceeding.
To use the iGUARD controller with an ECU equipped engine you must make the following
selections in the programming stacks:
In the miscellaneous parameters stack:
 Select the type of ECU (J1939).
 Select the manufacturer of the engine/ECU.
In the relay programming stack:
 Program a relay for "ECU enable". (relay 7 is default)
On SAE-J1939 equipped engines, the data connection will read any available status
messages, and if there is a wait to start message, the iGUARD will delay cranking until the
engine ECU clears that message.
The ECU broadcasts the data over the J1939 data connection and the iGUARD uses the
following parameters to operate:


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 Engine RPM
 Battery voltage
 Hours
Plus a number of status bits - such as wait to start, and the lamp codes (Shutdown, warning,
maintenance).
The iGUARD displays active fault codes*. Additionally, the engine faults and severity for the
most common faults and warnings are displayed not only as the Suspect Parameter Number,
(SPN) and failure mode indication (FMI) but also in plain text.
This is intended to help with any troubleshooting.
The numeric fault codes are always available, in case the fault or warning message is not one
of the ones supported by text description.
The iGUARD will show messages in the Warnings/faults status screen. There is a J1939
screen that shows specific J1939 fault codes, status of the indicator lamps etc. This screen
only shows up when the iGUARD is set up to run from ECU data.
Note: * Applicable if the ECU manufacturer supports Active Fault
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Manufacturers Specifics
As of May, 2003 here are known manufacturers wiring guides and some peculiarities
associated with each manufacturer:
Detroit Diesel DDEC IV ECU
 Install any/all ECU connections as per the DDEC manual.
 Program relay 7 on the iGUARD to be "ECU enable"
 Run a wire from the common of relay 7 to +V battery
 Run a wire from relay 7, normally open terminal to the DDEC IV wire 439.
Notes: DDEC systems prior to December 2002 did not broadcast DM2 (stored) fault codes.
DDEC II systems are not SAE-J1939 equipped.
Detroit engines having more than 8 cylinders use multiple ECU’s in a master/slave
relationship. This will require that the address claim selection be enabled in the J1939 setup
screen.
John Deere ECU




Install any/all ECU connections as per your ECU manual.
Program relay 7 on the iGUARD to be "ECU enable"
Run a wire from the common of relay 7 to +V battery
Run a wire from the normally open contact of relay 7 to terminal G on the 21-pin
instrument panel connector.
Notes: John Deere originally implemented J1939 revision 2. When finalized, it implemented
revision 4 of the standard. As long as the iGUARD is set to "DEERE" as a manufacturer, we
can determine the ECU software revision and automatically accommodate for this version.
Volvo PENTA series ECU
 Install any/all ECU connections as per your ECU manual.
 Program relay 7 on the iGUARD to be "ECU enable"
 Run a wire from the common of relay 7 to +V battery
 Run a wire from the relay 7, normally open contact to the ECU terminal P.
Notes: Volvo PENTA does not appear to claim / allow claim of addresses on the J1939
databus. The iGUARD will automatically accommodate this when the iGUARD is set to
"VOLVO" as the engine manufacturer. Recent ECU software upgrades for load sharing and
synchronization require additional connections to the ECU - See the data supplied with the
engine.
The Volvo ECU also supports crank control directly from the ECU. This further simplifies
connecting the iGUARD to the Volvo ECU.
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Caterpillar ECU




Install any/all ECU connections as per your ECU manual.
Program relay 7 on the iGUARD to be "ECU enable"
Run a wire from the common of relay 7 to +V battery
Run a wire from the normally open contact of relay 7 to pin 26 of the 40 pin
connector on the ADEM 3 ECU
Notes: The ADEM 3 ECU constantly broadcasts DM1 message "No error". Make sure that the
manufacturer is set to "Caterpillar" to accommodate this.
Deutz ECU




Install any/all ECU connections as per your ECU manual.
Program relay 7 on the iGUARD to be "ECU enable"
Run a wire from the common of relay 7 to +V battery
Run a wire from the normally open contact of relay 7 to pin 14 on the 25-pin EMR
connector
Cummins QS series ECU




Install any/all ECU connections as per your ECU manual.
Program relay 7 on the iGUARD to be "ECU enable"
Run a wire from the common of relay 7 to +V battery
Run a wire from the normally open contact of relay 7 to:
 Cummins QSM/QSX series: pin 38 on the 50-pin OEM connector

Cummins QSK-19 series: pin 01 on the 31-pin OEM connector

Cummins QSB/QSC series: pin A on the 23-pin OEM connector (engine access
connector)

Cummins QST-30 series: pin A on the 21-pin OEM connector
Notes: The Cummins G-Drive controllers (Except for the G-drive version of QSM) are not
currently J1939 enabled. The existing G-Drives are MODbus protocol RS-485 connection, and
are not currently (May 2003) supported by the iGUARD. This support will eventually be added
in the planned phase two firmware release. Contact the factory (918) 317-4100 about
availability.
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iGUARD Typical Installation and Mounting
Mechanical Installation and Mounting
Please make sure that the controller was not subjected to abusive handling during shipping
and that all the components are included.
You should receive the iGUARD controller, any accessories ordered such as wire harnesses,
CT’s, PT’s, senders, and this document.
The iGUARD controller is designed to be mounted within a customer-supplied panel. It can
also be installed in an optional set-top control box, or in the ‘doghouse’ of an AC alternator.
When the iGUARD is used as a standalone device, it must be mounted within a protective
housing. Refer to the cutout schematic (below) for layout of the cutout and mounting screw
holes.
Once the holes are cut, check to make sure that there is adequate clearance - so that the
edges of the iGUARD housing mounts flat and flush against the outside surface of your
enclosure.
IMPORTANT
Be sure to check that there are no loose metal shavings, or other
conductive debris that may fall into or get blown into the circuit boards of
the iGUARD.
Recommended torque for tightening the mounting screws is 9-inch
pounds. Only Polycarbonate compatible thread lock should be used for
the iGUARD mounting screws.
Insert the iGUARD controller from the front side of the panel and install the four mounting
screws and lock washers. Ensure that there is a good seal between the controller, the “O”
ring and the mounting panel. Plan the iGUARD mounting for easy wiring and access.
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iGUARD Dimensions and Cutout Schematic
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iGUARD Typical Connector Layout
iGUARD Typical Components
The iGUARD Controller
Components
1. Bezel / Faceplate
2. O-Ring
3. User Interface Board
4. I / O Board
5. Energy Monitoring Board
6. Cover
7. Standoffs
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iGUARD Electrical Installation
Electrical Hook up
There are several wire harnesses or wire harness plug-in connectors that may be shipped with
the controller.
 Two (2), 10-position connector: for J1939, RS485 / RS232
 One (1), 16-position connector: for Digital Inputs
 One (1), 18-position connector: for Digital Inputs
 One (1), 24-position connector: for Analog Inputs
 One (1), 6-position connector: for Current Transformer Inputs
 One (1), 4-position connector: for AC Voltage and Neutral Inputs
 One (1), 4-position connector: for DC supply
Additionally there is a 2-position connector for normally closed Emergency Shutdown switch
that is shipped installed on the controller. There are three (3), 1/4” blade-type push-on
terminals for each of the eight (8) form-C-relays. They are Normally Open, Normally Closed,
and Common. These contact outputs are dry. The dual row white connectors are all intended
for low voltage.
J1 – Power Connector
J2 – Communications Connector
This communications connector supports J1939 and Modbus server (slave).
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J3 – Communications Connector
This communications connector supports RS-232 for programming the controller with the
iGCON software tool, modem connection and the Modbus client (master) connection
J5 – Digital Inputs 1 - 8
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J6 – Digital Inputs 9 – 24
Signals for the digital inputs 1-24 must be in the in the range of +V battery and ground. With
the inputs wired as show (this is the default), they will be active when there is a ground applied
to the respective input. They can be connected to be active when +V battery is applied, but the
connections are different. See Alternate Signal Polarities for the Digital Inputs in the Analog
Inputs section, in this document.
J7 – Analog Inputs and Magnetic Pickup Input
The J7 connector is for analog inputs and the magnetic pickup input. The first 4 analog inputs
have current sources for driving standard resistive senders. For best accuracy, and most noise
immunity, senders should be of the two-wire type, with the return wire coming back to the
appropriate sender ground.
NOTE: Murphy recommends the use of two wire senders, with the sender
return connected to the analog channel.
If single ended senders are used, with ground provided at the sender itself, there can be a
number of problems that may or may not affect any given installation. Since the sender
body/threads provides sender ground, the use of thread tapes and compounds may give
erratic operation.
Additionally, the grounds may not be completely common between different parts of the
engine, alternator, and skid because there may be ground resistance between parts of the
generator caused by paint, sealing compounds, rust, debris etc., and there always exists a
greatly increased chance for noise and interference to affect the controller operation.
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J8 – Positive Emergency Stop
J8 - is the positive emergency stop. From the factory there is a loop from terminal 1 to terminal
2. The controller will power up, but will not operate the relays without this connection. If your
application requires a true positive emergency stop, we recommend that you install a normally
closed type switch between terminals 1 & 2. In the event of an emergency stop, actuating the
switch will remove power to the relays which will then return to their un-powered state.
NOTE: Be aware that the iGCON software tool cannot update the
operating firmware unless the J8 jumper is either open or removed
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I/O Board Relays
The 8 relays mounted on the I/O board are pre-programmed at the factory to:
Relays may be re-assigned to any of the other desired functions at will from the front panel.
Energy Monitoring Board (EMB)
From the rear of the unit, there is a smaller board on the left side. This is the energy monitoring
board. All the AC connections are made here. It has two single row black connectors labeled
J9 & J10.
J9 – AC Voltage Connections
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In 3-phase applications apply:
phase A to terminal 1
phase B to terminal 2
phase C to terminal 3
neutral to terminal 1
In single phase applications apply:
phase A to terminal 1
phase B to terminal 2
neutral to terminal 4
In Center Tapped Delta applications, apply:
phase A to terminal 1
phase B to terminal 2
phase C to terminal 3
neutral to terminal 1
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J10 – Connections from the CT’s
The most accurate method of measuring current will be to connect each wire from each of the
CT’s directly to the controller at J10. The controller offers a low impedance path to neutral
(~.25 Ohms) so the common mode voltage will be well within a safe range.
In applications where the CT’s are commoned together (4 wires - CT1+, CT2 +, CT3+ and
CT common) the system will only read 1/2 of the current signal, unless the iGUARD is
programmed to reflect commoned CT’s.
The iGUARD supports both, full differential CT inputs (both wires from each CT brought back
to the EMB) and “commoned” CTs (where the high sides are brought back individually but
the low sides are all connected together). See the following illustration of current input
construction.
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In fully differential connections, wire CT1+ to J10-1 to J10-2, etc. For commoned CT
connections bring CT1+ to J10-1, CT2+ to J10-3 and CT3+ to J10-5. Connect CT1-, CT2-, and
CT3- together and then connect to AC neutral. There is no need to jumper J10-2, 4 and 6 to
anything, although you can connect them to AC neutral if you wish.
There is a software selection in the iGUARD that must be set appropriate to the connection
method you are using. See Operating Sequence in the iGUARD Operating Instructions section
in this document.
The measuring method in the iGUARD controller requires that AC neutral and earth remain
with 1/2 VDC for accurate measurements, and within 6 VDC to prevent damage to the Energy
monitoring board (EMB). The controller offers a low impedance path to neutral (˜.025 Ω) so
the common mode voltage will be within a safe range.
Commercially Available Connectors
Connections to the iGUARD are via Molex connectors, MiniFit Jr. (for white/opaque white
signal level connectors), and Sabre series (for black EMB AC voltage and current connectors).
12 foot long harnesses are available from Murphy (see “Options and Accessories” section).
If you elect to build your own wire harnesses the following information on manufacturer’s part
numbers will be useful.
Connector Part Numbers
The MiniFit Jr. Series of connectors requires a crimping tool (such as a universal crimper) to
properly terminate the connectors. When terminating multiple wire harnesses, contact your
local Molex distributor for information on automated termination tooling.
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An extractor tool might also be necessary in case of a broken wire, misinserted terminal, or
when a wire needs to be removed.
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Installing the Mimic/Annunciator DM/A
DM/A Mimic/Annunciator Versions
This covers versions 1.26 and higher. The DM/A or Mimic/Annunciator is the repeater unit for
the iGUARD (Master) controller. The Mimic/Annunciator features the front bezel display which
includes the user interface board and Modbus device that communications with the iGUARD
(Master) controller and a wire cover. To operate the DM/A, power must be supplied to the J1
connector on the rear of the unit.
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J1 Power Connector
The iGuard Mimic / Annunciator is powered using the J1 connector. The connector is wired as
shown below:
J3 Communications Connector
The iGuard Mimic / Annunciator communicates with the host iGUARD controller via a RS485
two-wire + shield connection. The connector is wired as shown below:
1. To configure the DM/A for a particular application do the steps as follows:
2. Press the BACK & NEXT keys at the same time.
3. The screen will change to identify the hardware/software as configured.
4. Press NEXT. The top line will display the station number.
The menus are as follows:
1. Modbus server address - This is the address of this device as seen on the network.
Default is 243.
2. Key sensitivity level - This sets the required amount of force to activate the keypad.
Default is Normal
3. LCD backlight - This selects whether the LCD backlight is enabled or not. If disabled, the
backlight will not come on. Default is enabled
4. iGUARD beeper - This selects whether or not the station beeper is enabled. If disabled, the
station will not sound any audible alarm for faults or warnings. Default is enabled.
5. Interface type - hard coded to RS485 Modbus
6. RS485 bit frame - Sets the configuration of the data transmission. Default (to match the
iGUARD default) is 10 bits N-8-1.
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7. RS485 baud rate - Selects the data transmission rate, and must match the rate settings on
the iGUARD it is connected to. Default is 38400.
NOTE: There are corresponding settings in the iGUARD for choosing how
the station operates*. The selections are "Mimic" and "Annunciator" In
Mimic mode, the remote station is allowed to behave exactly as if it were
the front panel of the actual iGUARD - the user may start and stop
manually, change between automatic and manual modes, acknowledge
alarms, and reset the system. The only thing that a mimic panel cannot do
is change the programming on the master.
In Annunciator mode, the station may acknowledge its own alarms and
look at data, but it cannot do any control functions.
* See page 13 (21 - Repeater #1) and page 14 (22 - Repeater #2) for specifics.
iGUARD ECU Wiring
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iGUARD Non-ECU Wiring
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iGUARD Three Phase Wiring
iGUARD Single Phase Wiring
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iGUARD In Center Tapped Delta Wiring
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iGUARD Sequence Appendix
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Specifications
Mounting (Cutout) Dimensions:
7.05 x 5.25 x 2.76 in. (179 x 133 x 70 mm).
Mounting Screws: 4, #6-32 screws and nitrile rubber o-ring are supplied to meet NEMA4
specs.
Case Material: Black Polycarbonate, textured finish, UV stabilized.
Connection: 600V rated multi-wire quick connect for DC and AC connections, suitable for wire
harnessing.
Power supply: Operates from any DC supply for 8-35VDC continuous. Brownout (5V) ride
through is 5 seconds and a total blackout (0V) ride through of 100 milliseconds.
Vibration/Survivability: 3g, 3 axis, frequency swept 10-1000 Hz.
Operating/Storage Temperature Range: –40/+185°F (–40/+85°C).
LCD Operating Range: –4/+176°F (–20/+80°C).
I/O’s: Designed to meet NFPA110/NFPA 99 plus offers additional inputs.
Performance Specifications: NFPA110, NFPA 99, SAE Load Dump Test.
Shipping Dimensions: 10 x 9 x 6 in. (254 x 229 x 152 mm).
Shipping Weight: 2 lb. (910 g.).
Standard Components
24 - Digital inputs
1 - RS232 port
7 - Analog inputs
1 - RS485 port
Inputs for up to 3-phases and neutral of AC voltage
1 - RS232/RS485 port
Inputs for 3 CT’s for current monitoring
1 - J1939 port
1 - Magnetic pickup input
1 - 64 x 128 pixel full graphic LCD with backlight
8 - 20A Form “C” relays
1 - 12 position keypad
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iGUARD Options and Accessories
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MURPHY and the Murphy logo are registered and/or common law trademarks of Murphy Industries, Inc. This
document, including textual matter and illustrations, is copyright protected by Murphy Industries, Inc., with all
rights reserved. (c) 2011 Murphy Industries, Inc. Other third party product or trade names referenced herein are
the property of their respective owners and are used for identification purposes only.
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