INTELLI-HOOD® TROUBLESHOOTING GUIDE

INTELLI-HOOD®
TROUBLESHOOTING GUIDE
®
Melink Corporation
(513) 965-7300
www.melinkcorp.com
Last Updated 7/22/2015
Table of Contents
Page
I.
About this Document
2
II.
Related Documents
2
III.
Glossary of Abbreviations
3
IV.
Diagnostics/Troubleshooting
4
a. Touchpad Display
4
b. System Controller
6
c. Hood Controller
7
d. Optic/Temp Sensor
7
e. VFD’s
8
f. EF’s
9
g. MUA Interlock
9
h. BAS/BACnet
10
i. AIO
10
j. ALC
11
k. APD
11
1
Intelli-Hood®
Troubleshooting Guide
I.
About this Document
The purpose of this document is to provide basic troubleshooting techniques for the Intelli-Hood
Kitchen Control System. The intended audience of this document is the end user of the system:
the building owner, kitchen manager, kitchen staff, or maintenance technician.
II.
Related Documents
Operations and Maintenance Manual

Provides information regarding basic operation & maintenance.
Installation Manual

Provides detailed installation instructions of the components including mechanical installation
of parts, power wiring, and control wiring.
VFD Manuals


Refer to documents provided by the VFD manufacturer for information regarding any aspect of
the Variable Frequency Drives including power wiring, control wiring, programming, and faults.
Information can be found on their respective web pages.
System is continually expanding capabilities. Presently, capable of utilizing Modbus control for
ABB, Allen-Bradley, Trane, Danfoss, Siemens, Schneider, Samsung, & Yaskawa.
2
III.
Glossary of Abbreviations
The following terms and abbreviations are used throughout literature pertaining to the
Intelli-Hood System.

IH:

VFD:

TP:

APU: Air Purge Unit

SC:
System Controller

HC:
Hood Controller

AT:

AIO: Auxiliary Analog Out Device

ALC: Auxiliary Light Controller

APD: Auxiliary Power Device

EF:

MUA: Make Up Air
Intelli-Hood
Variable Frequency Drive
Touchpad
Auxiliary Touchpad
Exhaust Fan
3
IV.
Diagnostics/Troubleshooting
a. Touchpad Display (TP)
Fault Description

Temp Fault







Optic Fault





4
Items to Check
Make sure that the sensors are clean. It is not
always necessary unless it has a large
amount of grease or build up.
Check the connections that go from the
temperature probe to the Hood Controller.
Check for any damaged components.
Check that the number of temp sensors
installed matches the number of temp
sensors programmed. Under menu hit Status
(1) and go to hood controllers (3) and hit
enter. If a temperature sensor is not
connected properly or does not work then it
will show as “missing”.
Check Temperature offset
On the hood controller there are different
ports that can be used to connect the cables
for temperature sensors, swapping those may
help to get rid of the fault.
Check if temperature sensor resistance is
approximately 100 Ohms.
Cycle power to the unit.
Verify no obstructions to optic sensor infrared
beam (Ansul Pipes, pots / pans, etc).
Confirm sensor lenses are clean.
Make sure that the cables are connected
tightly on optic boards & on the hood
controller.
Check alignment; use web application to
check gain/voltage levels.
If see attempts to calibrate when changing
alignment, hardware is working properly.
Using the keypad, go to Status and under
hood controller verify that the optics are not

Variable Frequency Drive (VFD) Comm. Fault



Touchpad Frozen



Unable to enter System Configuration

Touchpad not displaying correct devices (OR)
Multiple Touchpads on same SC are frozen

Light Button Works but TP is blank


Fans Button not working

5
missing.
Cycle power to the unit.
VFD type (ABB, Allen Bradley, Danfoss, etc)
may not be identified correctly in Exhaust Fan
or Aux Airflow programming.
Check EF &MUA Aux Airflow status and
confirm VFD type is correct.
Check display on VFD(s) for a fault (i.e. F5 or
F13). Go to respective VFD and confirm if any
fault codes exist and troubleshoot in
accordance with VFD User’s Manual.
System may have lost configuration or
configuration file was corrupted, tech support
downloads the configuration files and emails it
to the technician working on site. The tech
will drag it to the root directory of a USB and
save it as a ConfigurationFiles.zip file, power
off the unit, place USB in port, cycle power on
to the unit.
Verify that the base board LED’s are lighting
up. Power the system controller off, replace
the cell battery on the base board then power
back on.
Confirm proper addressing of Network
Devices (Hood Controllers and Touchpads).
Enter menu screen on Touchpad, and with
System Configuration selected, press and hold
up/down arrows until text changes from red
to blue (Approx 15 seconds)
Check hardcoded address on Touchpad (TP),
press and hold the up/down arrows on the TP
for 30 seconds. Change address to correct
number. Power cycle System Controller to
hardcode new address. Replacement TP
maybe defaulted to address of 1.
Check programming of devices in service app.
TP ribbon cable loose between boards (OR)
boards not seated
Check Exhaust Hood menu. Confirm on/off
Touchpad displaying incorrect Exhaust Fan (EF) &
Make-Up Air (MUA)


control is set to correct Touchpad address
Check Exhaust Hood menu. Confirm
Touchpad Display Node
Check corresponding EF's & MUA's devices to
confirm which TP is actually selected
b. System Controller (SC)
Fault Description
LED’s not on


LED on CPU Board not pulsing green
Digital Inputs / Outputs programmed but inactive


Unable to Direct Connect via PC
Auxiliary Input / Output (AIO) not working


Lights not working


24VDC is not there



System won’t turn on






6
Items to Check
System may have lost input power.
Check connectors from Power Brick to I/O
Board.
Firmware may be corrupted.
Verify DI/DO(s) are assigned to Exhaust
Hood.
Verify Use DHCP set to No.
Verify System Controller (SC) and Variable
Frequency Drives (VFD’s) parity is set to 8-N1.
Check fuse, if blown confirm lighting circuit is
less than 15 amps.
Confirm lighting leads are wired to System
Controller (SC) or Auxiliary Light Controller
(ALC) for control.
Check 24VDC fuse.
Check 24VDC connection from power board to
base board.
Verify DI/DO(s) are assigned to exhaust
hoods.
Check power dipswitch located near fuse is
“ON”.
Check for AC power, may be interrupted by a
shunt trip or Ansul micro switch.
Check circuit breaker panel.
If power is at the System Controller (SC),
check fuse.
Check Power Brick to I/O Board connections
Possible interlock with enable feature selected
Digital Input / Outputs are not controlling proper
hoods

to Building Automation System (BAS) or
Water Wash Panel.
Confirm “Hood Groups” programmed correctly
c. Hood Controller (HC)
Fault Description
LED not pulsing
Items to Check
Hood Controller (HC) may have lost
communication to System Controller (SC).
Confirm cable connections to other HC’s &
SC.
Confirm HC rotary switches are set to proper
address.
If HC is last in the Hood Network string,
confirm Terminal Resistor dip switch is on.
Check for voltage drop issue.
Check cable connections


Hood Controller (HC) LED pulsing but not
communicating correctly


APU fan(s) not working


d. Optic/Temp Sensor
Fault Description
Optic Fault
“Emitter Missing” ▪ White printed circuit Board
“Receiver Missing” ▪ Blue Printed Circuit Board






7
Items to Check
Verify no optic sensor obstructions in hood.
Confirm sensors are clean.
Make sure that the cables are connected
tightly on optic boards & on the hood
controller.
Check alignment; use web application to
check gain/voltage levels.
If see attempts to calibrate when changing
alignment, hardware is working properly.
Using the keypad, go to Status and under
hood controller verify that the optics are not
missing.
Many smartphone cameras can see Emitter
Light. Use phone camera to verify light is
emitting.

Temp Fault

Make sure that the sensors are clean. It is not
always necessary unless it has a large
amount of grease or build up.
Check the connections that go from the
temperature probe to the HC.
Check for any damaged components.
Check that the number of temp sensors
installed matches the number of temp
sensors programmed. Under menu hit Status
(1) and go to hood controllers (3) and hit
enter. If a temperature sensor is not
connected properly or does not work then it
will show as “missing”.
On the hood controller there are different
ports that can be used to connect the cables
for temperature sensors, swapping those may
help to get rid of the fault.
Verify temperature sensor resistance is about
100 Ohms.
Cycle power to the unit.


Temp probe may be defective.
Temp offset may be programmed incorrectly.

Items to Check
Confirm Fault codes and refer to VFD
Operations Manual.





Temperature not measuring correctly
e. Variable Frequency Drives (VFD’s)
Fault Description
Depends on VFD type
8
f. Exhaust Fans (EF’s)
Fault Description
EF will not run

EF has high current draw



EF is running, but low to no air flow







EF has an over voltage
EF are running at 100%, but the MUA not running

Items to Check
Confirm no faults at the Variable Frequency
Drive (VFD).
Verify disconnect on the roof is turned on.
Confirm motor rotation is spinning in the
correct direction.
Confirm actual condition of the motor. Belt
tension correct or general cleaning performed.
Grease filters may need to be cleaned.
Check belt on fan, it may be broken or loose.
Obstruction in the duct.
If installed, dampers stuck shut.
Duct cleanout removed.
Check for condensation in the disconnect.
System Controller (SC) has lost power
(Firemode)
Possible override interlock to Variable
Frequency Drives (VFD’s) from other control
sources if power is present and System
Controller (SC) is operating.
g. Make-Up Air (MUA) Interlock
Fault Description
MUA will not turn on

System will not speed up when call for heat (OR) call
for cool

9
Items to Check
Confirm start/stop from a 24VDC relay or
internal relay is connected from the SC to the
correct terminal points on the MUA control
circuit.
Confirm closure is received at the System
Controller (SC) for the correct terminal points
of the Make-Up Air (MUA). (Generally after
the Outdoor Air Temperature Sensor but
before the Low Air Pressure switch).
h. Building Automation System (BAS) & BACnet
Fault Description
BAS cannot discover System Controller (SC)
BAS cannot discover Exhaust Fan (EF) & Make-Up Air
(MUA) data

Items to Check
Check Ethernet cable and port connection.

Confirm IP address in the About Screen.

Check IP settings are configured per site’s IT
requirements in the System Menu. Static IP
(If not using DHCP), Netmask, Gateway,
Domain Name System (DNS) Server 1, DNS
Server 2
Destination Network (DNET) number might
need to be changed from 1 to a unique
number to avoid data collision

i. Auxiliary Input / Output (AIO)
Fault Description
AIO won’t work




10
Items to Check
Check connections, 24VDC and digital comms
from System Controller (SC) to AIO.
Confirm device exists in configuration,
configuration settings and associated AUX air
flows programmed and their associated
devices providing speed reference.
Confirm parity in SC and Variable Frequency
Drives (VFD’s) is set to 8-N-1.
Confirm dip switch on module set to
“Normal”
j. Auxiliary Light Controller (ALC)
Fault Description
ALC won’t work




Items to Check
Check Ethernet cable and port connection.
Confirm light controller address selected on
touchpad for lights operation.
Confirm device exists in configuration.
Confirm lighting circuit is connected to ALC
from control.
k. Auxiliary Power Device (APD)
Fault Description
APD is not boosting signal



11
Items to Check
Check circuit breaker.
Check connections.
Check for power.