Operator’s
Manual
Series 300
Automatic Transfer Switches
H–design 600 through 1200 amps
DANGER is used in this manual to warn of high
voltages capable of causing shock, burns, or death.
TABLE OF CONTENTS
section
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
WARNING is used in this manual to warn
of possible personal injury.
SEQUENCE OF OPERATION . . . . . . . . . . . . . 2
TESTING & SERVICE . . . . . . . . . . . . . . . . . . . . 3
CAUTION is used in this manual to warn
of possible equipment damage.
An experienced licensed electrician must install the ATS.
Refer to the outline and wiring drawings provided
with ASCO Series 300 ATS for installation details.
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONTROL FEATURES . . . . . . . . . . . . . . . . . . . 5
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . back cover
600, 800, 1000 amp. sizes
50 Hanover Road, Florham Park, New Jersey 07932–1591 USA
For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com
1200 amp. size
381333–201 E
ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3
telephone 519 758–8450, fax 519 758–0876, for service call 1 888 234–2726 (ASCO) www.asco.ca
Nameplate
Catalog Number Identification
The Transfer Switch nameplate includes data for each
specific ASCO Series 300 ATS. Use the ATS only
within the limits shown on this nameplate.
A typical Catalog Number is shown below with its
elements explained. The example is for a Series 300
ATS with switched neutral, 3 pole, 600 amp, 480 V, in
a Type 1 enclosure:
H 300
Neutral
B – switched
C – overlapping
blank – solid
B
Phase Poles
2 – single Ø
3 – three Ø
3
600
Amperes
600
800
1000
1200
N
1
Voltage
C 208
D 220
E 230
F 240
H 380
J 400
K 415
L 440
M 460
N 480
P 550
Q 575
R 600
C
Controller
Enclosure
1 – standard
C – type 1
F – type 3R
G – type 4 *
L – type 12 *
1X – if
accessories
ordered
blank – open type
* available 600 – 1000 amp. sizes only
Controller
neutral
connections
power
connections
membrane
controls
Transfer
Switch
terminal block TB
for engine start
and switch
position contacts
power
connections
neutral
connections
600 amp. size in typical enclosure with location of customer connections
ASCO Series 300 Automatic Transfer Switches (ATSs) are
Listed under Underwriters Laboratories UL 1008 Standard
for Safety for Automatic Transfer Switches. All control
features are UL Component Recognized, which assures that
ASCO automatic transfer switches meet OSHA Safety
Requirements and will be acceptable to electrical inspectors.
ASCO Series 300 Automatic Transfer Switches are suitable
for emergency and standby system applications. They meet
emergency system rating requirements as defined in
National Electrical Code (NEC) Article 700 and UL 1008.
Also, they are suitable for the requirements of NEC Article
517 – Health Care Facilities, NEC Article 701 – Legally
Required Standby Systems, NEC Article 702 – Optional
neutral
connections
Standby Systems, NFPA 99 Health Care Facilities, and
NFPA 110 Emergency and Standby Power Systems.
Rating Label
Each automatic transfer switch contains a rating label to
define the loads and fault circuit withstand / closing ratings.
Refer to the label on the transfer switch for specific values.
Do not exceed the values on the rating label.
Exceeding the rating can cause personal injury
or serious equipment damage.
Controller
power
connections
membrane
controls
Transfer
Switch
terminal block TB
for engine start
and switch
position contacts
power
connections
neutral
connections
800 and 1000 amp. size in typical enclosure with location of customer connections
Controller
membrane
controls
neutral
connections
power
connections
Transfer
Switch
terminal block TB
for engine start
and switch
position contacts
power
connections
neutral
connections
1200 amp. size in typical enclosure with location of customer connections
SECTION 1
Series 300 Automatic Transfer Switches are factory wired
and tested. Installation requires skid removal then
securing the enclosure to the supporting foundation.
Remove the Shipping Skid
Open the front door and remove the four lag screws (2 in
front, 2 in rear) securing enclosure to the wood skid.
INSTALLATION
Testing Power Conductors
Do not connect the power conductors to the ASCO
Series 300 transfer switch until they are tested. Installing
power cables in conduit, cable troughs and ceiling-suspended hangers often requires considerable force. The
pulling of cables can damage insulation and stretch or
break the conductor’s strands. For this reason, after the
cables are pulled into position, and before they are
connected, they should be tested to verify that they are
not defective or have been damaged during installation.
Supporting Foundation
The supporting foundation for the enclosure must be
level and straight. Refer to the applicable enclosure
outline drawing included with the Series 300 for all
mounting details including door opening space.
Protect the automatic transfer switch from
construction grit and metal chips to prevent
malfunction or shortened life of the ATS.
If bottom cable entry is used, the foundation must be
prepared so that the conduit stubs are located correctly.
Refer to the enclosure outline drawing for specified area
and location. Provide cable bending space and clearance
to live metal parts. When a concrete floor is poured, use
interlocking conduit spacer caps or a wood or metal
template to maintain proper conduit alignment.
Connecting Power Conductors
Refer to the applicable enclosure outline drawing furnished with this switch and mount the Series 300
according to details and instructions shown on diagram.
After the power cables have been tested, connect them to
the appropriate terminal lugs on the transfer switch as
shown on the wiring diagram provided with this Series
300. Make sure the lugs provided are suitable for use with
the cables being installed. Standard terminal lugs are
solderless screw type and will accept the wire sizes listed
on the drawings provided with the Series 300. Be careful
when stripping insulation from the cables; avoid nicking
or ringing the conductor. Remove surface oxides from
cables by cleaning with a wire brush. When aluminum
cable is used, apply joint compound to conductors.
Tighten cable lugs to the torque specified on rating label.
Line Connections
Controller Ground
Refer to the Wiring Diagram provided with your Series
300 ATS. All wiring must be made in accordance with the
National Electrical Code and local codes.
A grounding wire must be connected to the controller’s
lower left mounting stud. Because the controller is
mounted on the enclosure door, a conductive strap must
be used between the enclosure and the door. This
connection provides proper grounding which does not
rely upon the door hinges.
Mounting
It is unnecessary to remove pole covers from the transfer
switch. If you do remove them, reinstall them carefully.
Harnesses
De–energize the conductors before making any
line or auxiliary circuitry connections. Be sure
that Normal and Emergency line connections
are in proper phase rotation. Place engine generator starting control in the OFF position. Make
sure engine generator is not in operation.
The transfer switch is connected to the left side of the
controller by a plug–in harness (two plugs).
1---1
INSTALLATION (continued)
Engine Starting Contacts
Customer connections for engine control contact and TS
auxiliary contacts connections are located on terminal
block TB which is mounted on the front lower left of the
transfer switch. Refer to wiring diagram provided with
the Series 300 ATS and connect the engine start wires to
the appropriate terminals. See Figure 1–1 and Table A.
Table A. Engine start
connections.
When normal
source fails
contact closes
contact opens
Terminals
on transfer
switch
TB1 and TB2
TB1 and TB3
left side of
transfer switch
COMMON
Engine Starting
Signals
FEATURE 7
5 amps, 32 V DC
5 amps resistive 28 V DC
or 120 V AC max.
closes to start
FEATURE 8
opens to start
COMMON
TS Auxiliary Contacts
Feature 14A & 14B
FEATURE 14B
10 amps, 32 V DC
10 amps 250 V AC
general purpose
closed on emergency
FEATURE 14A
Auxiliary Circuits
Connect auxiliary circuit wires to
appropriate terminals on transfer
switch terminal block TB as shown
on the wiring diagram provided
with this Series 300 Automatic
Transfer Switch. Make the necessary auxiliary connections by referring to Section 5, Control Features.
closed on normal
Optional
TS Auxiliary Contacts
Feature 14AA & 14BA
COMMON
FEATURE 14BA
closed on emergency
FEATURE 14AA
10 amps, 32 V DC
10 amps 250 V AC
general purpose
closed on normal
terminal block for engine start and
auxiliary circuit connections
Connections to Controller
for other Control Features
(located on bottom of Controller)
Programmable
Load Disconnect
Engine Exerciser
Feature
connection,
Connections
if provided
(see Wiring Diagram
(refer to
& refer to page 5–4
for DIP switch settings) page 5–3)
Figure 1-1. Engine start and auxiliary circuit
terminal block TB located on the transfer switch.
Remote Control Features Connections
(refer to the Wiring Diagram &
page 5–4 for DIP switch settings)
Each control contact must be suitable
for a 5 V DC low energy circuit.
for factory
use only
Figure 1-2. Input / output label on the Controller showing possible connections to the lower terminal block.
1---2
INSTALLATION (continued)
Functional Test
The Functional Test consists of three checks: manual
operation, voltage checks, and electrical operation.
Do these checks in the order presented to
avoid damaging the automatic transfer switch.
Read all instructions on the Wiring Diagram and labels
affixed to the automatic transfer switch. Note the control
features that are provided and review their operation
before proceeding.
left side of
transfer switch
1 – Manual Operation Test
A detachable maintenance handle is provided on the frame
of the Transfer Switch for maintenance purposes only.
Manual operation of the transfer switch should be
checked before it is energized (operated electrically).
Do not manually operate the transfer switch
until both power sources are disconnected:
open both circuit breakers.
1.
2.
maintenance
handle
After deenergizing both power sources, open the
enclosure door. Locate and remove the maintenance handle from the clips on the left side of the
transfer switch frame. Insert the handle into the hole
in the molded hub on the left side of the operator.
See Figures 1–3 and 1–4 and Table B.
Move the maintenance handle up or down as shown to
manually operate the transfer switch. It should operate
smoothly without any binding. If it does not, check for
shipping damage or construction debris.
Table B. Maintenance handle positions.
ATS Position
Handle
Indicators
E
up
N=C
N
lower contacts closed
E=C
E
N
handle
hub
N=O
down
3.
Return the transfer switch to the Normal position.
Observe that the window indicators (right side) show
the top shaft O (open) and the bottom shaft C (closed).
Verify that the maintenance handle
has been removed before proceeding!
upper contacts closed
Emergency
Figure 1-3. Maintenance handle & storage location.
Note: If Normal and Emergency connections are
reversed this operation is also reversed.
4. Remove the maintenance handle and store it on the
frame (left side) in the clips provided.
E=O
upper contacts open
Normal
storage clips
Now continue to 2 – Voltage Checks on next page.
lower contacts open
Emergency
contacts
UP closes the
Normal source
contacts (lower)
window
indicators
O is open
C is closed
DOWN closes the
Emergency source
contacts (upper)
contact position
indicators (right side)
Normal
contacts
frame
Figure 1-4. Maintenance handle operation and contact position indicators.
1---3
INSTALLATION (continued)
observe these lights
Figure 1–5. St andard controls and indicators.
2 – Voltage Checks
First check nameplate on transfer switch; rated voltage
must be the same as normal and emergency line voltages.
Verify that the feeders have been
connected to the proper lugs.
Close the normal source circuit
breaker. The Normal Transfer
1 Switch Position and the Normal
Source Accepted lights should
come on.
Source Accepted
Normal
Emergency
Use an accurate voltmeter to
check phase to phase and
2 phase to neutral voltages present at the transfer switch normal
source terminals.
Use extreme caution when using a meter
to measure voltages in the following
steps. Do not touch power terminals;
shock, burns, or death could result !
Perform steps 1 through 6 at the right. Observe the status
lights. See Figure 1–5.
● Black circle means light is on.
❍ White circle means light is off.
* If necessary, adjust voltage regulator on the generator
according to the manufacturer’s recommendations. The
Automatic Transfer Switch will respond only to the rated
voltage specified on the Transfer Switch nameplate.
Close the emergency source
circuit breaker. (Start generator,
3 if necessary.) The Emergency
Source Accepted light should
come on.
Source Accepted
Normal
Emergency
Use an accurate voltmeter to
check phase to phase and
4 phase to neutral voltages present at the transfer switch emergency source terminals.*
Use a phase rotation meter to
check phase rotation of emer5
gency source; it must be the
same as the normal source.
Shut down the engine–generator, if applicable. The Emergency Source Accepted light should
6 go off. Then put the starting
control selector switch (on the
generator set) in the automatic
position. Close enclosure door.
A B C
Source Accepted
Normal
Emergency
Now continue to 3 – Electrical Operation on next page.
1---4
INSTALLATION (continued)
observe these lights
press this button
Figure 1–6. Standard controls and indicators.
3 – Electrical Operation
This procedure will check the electrical opertion of the
Automatic Transfer Switch. See Figure 1–6.
The normal source must be
available and the generator
1 must be ready to start.
Check that the Normal Source
Accepted light is on.
Press and hold the Transfer Test
button until the engine starts
2
and runs. This should happen
within 15 sec.
Close the enclosure door first !
Transfer Test
Both normal and emergency sources must be available
and the emergency source generator (if used) must be
capable of being started in this procedure.
Perform steps 1 through 8 at the right. Observe the status
lights.
The Emergency Source
3
Accepted light should come on.
4
● Black circle means light is on.
❍ White circle means light is off.
5
NOTE: If Motor Load Transfer feature
is activated, then transfer may not occur
immediately after the respective time
delays. Transfer will only occur when
the phase relationship between sources
is correct.
6
This completes the Functional Test of the ASCO Series 300
Automatic Transfer Switch. Leave the engine–generator
starting control in the automatic position.
7
The transfer switch should
transfer to the Emergency
position. The Emergency
Transfer Switch Position light
should come on and the Normal
light should go off.
If the transfer to emergency
delay is used the transfer
should occurs after a time delay
(up to 5 minutes).
For immediate transfer press
the Bypass Time Delay button.
The transfer switch should
transfer back to the Normal
position. The Normal Transfer
Switch Position light should
come on and the Emergency
light should go off.
If the retransfer to normal delay
is used the retransfer should
occur after a time delay
(up to 30 minutes).
For immediate retransfer press
the Bypass Time Delay button.
The unloaded running delay
keeps the generator running for
5 minutes (cool–down period).
8
Then the generator should stop
and the Emergency Source
Accepted light should go off.
1---5
Source Accepted
Normal
Emergency
Transfer
Test
Source Accepted
Normal
Emergency
Transfer Switch
Position
Normal
Emergency
Bypass
Time Delay
Transfer Switch
Position
Normal
Emergency
Bypass
Time Delay
Source Accepted
Normal
Emergency
SECTION 2 SEQUENCE OF OPERATION
Lights show position of transfer switch.
Transfer To Emergency
The sequence for load transfer to
emergency source begins automatically when normal source voltage
falls below the preset dropout point
or when Transfer Test button is
pressed. An under voltage condition
on any phase of the normal source is
detected by the sensor.
Lights show the sources accepted.
Light for built–in
engine exercise timer:
➤ blinks rapidly when
button is held 5 sec.
while being set
➤ blinks slowly when
button is released (set)
and during 20 min.
exercise period.
➤ stays on after engine
stops (exerciser is
enabled for weekly
operation)
When the normal
source voltage fails or
See page 5–1
the Transfer Test button
for complete
is pressed, the SE relay
Hold 15 sec. to
Hold 5 sec. to set
instructions
Press
to
cancel
the
de-energizes and relay start the engine
active exercise period 20 min. engine exercise
NR begins its timing generator and to (stops engine now or period immediately (engine
cycle (1 or 3 seconds, transfer the load after cooldown) See starts) and weekly thereafter.
page 5–1.
momentary normal to emergency.
Figure 2–1. Membrane controls and indicator lights.
source outage delay).
Retransfer to Normal
The NR relay is provided with a time delay on dropout to
override momentary outages and prevent nuisance starting
The sequence for load retransfer to the normal source
of the engine-driven generator. If the normal source voltage
automatically begins when the voltage sensor detects
returns above the sensor dropout setting before the time
restoration of the normal source. The voltage level must
delay expires, the NR relay timing cycle is reset to zero and
rise above the preset pickup point on all phases before
relay SE energizes.
the sensor will accept the normal source.
If the normal source voltage does not return above the
sensor dropout setting before the time delay expires, the
NR relay de-energizes and signals the engine-driven
generator to start. At the same time, a voltage and
frequency sensor begins monitoring the emergency source.
The sensor will accept the emergency source only when
both voltage and frequency reach preset pickup points.
Usually about ten seconds elapse from dropout of the NR
relay to acceptance by the sensor. This time span occurs
because the engine-driven generator must crank, start, and
run up to nominal pickup points. For this reason, if the
Transfer Test button is pressed it must be held for 15 seconds.
If the emergency source is available immediately, the sensor
may accept it as soon as NR relay drops out.
When the normal source is accepted by the sensor, relay
SE begins its timing cycle (adjustable 1 sec. to 30 min.,
retransfer to normal delay). For immediate retransfer
press Bypass Time Delay button. SE relay is provided with
a time delay on pickup to prevent immediate load
retransfer to the normal source. The delay insures that
the normal source has stabilized before reconnection of
vital loads. If the normal source voltage falls below the
present dropout point before the time delay expires, the
timing cycle is reset to zero. If the emergency source fails
for more than 4 seconds during the timing cycle, ER relay
drops out and the load is immediately retransferred to
the normal source, if that source is acceptable.
SE relay energizes and ER relay is dropped out. The TS
coil is energized, the transfer switch operates, and all
switch contacts (mains, controls, auxiliaries) reverse
position. The transfer switch is now supplying the load
from the normal source again.
When the emergency source is accepted by the sensor,
relay ER begins its timing cycle (transfer to emergency
delay). ER relay is provided with an adjustable (0 to 5
minutes) time delay on pickup to delay transfer of the
load to the emergency source. For immediate transfer
press Bypass Time Delay button.
Upon retransfer to the normal source, NR relay begins its
timing cycle (unloaded running delay [engine cooldown] ).
NR relay is provided with a 5 minute time delay on pickup
to keep the engine running for a cool-down period.
ER relay energizes, the TS coil is energized, the transfer
switch operates, and all switch contacts (mains, controls,
auxiliaries) reverse position. The transfer switch is now
supplying the load from the emergency source.
NR relay energizes after the time delay and signals the
engine-driven generator to shut down. All circuits are
reset for any future normal source failure.
The transfer switch will remain in the Emergency
position until the normal source is restored. If the
Transfer Test button is used, the transfer switch will
remain on emergency until the retransfer to normal delay
times out.
Activation of standard control features shown in Section 5
will alter the sequence of operation and introduce
additional time delays during transfer operations.
2---1
SECTION 3
TESTING & SERVICE
PREVENTIVE MAINTENANCE
DISCONNECTING THE CONTROLLER
Reasonable care in preventive maintenance will insure
high reliability and long life for the automatic transfer
switch.
The harness disconnect plugs are furnished for repair
purposes only and should not have to be unplugged. If the
controller must be isolated, follow these steps carefully.
Operate the switch at least once a month. Perform this
four step Electrical Operation Test. This is a test with
load transfer.
Disconnecting the Plugs
Do not unplug the controller until step
1a. or 1b. below is completed.
1. Observe the position of the transfer switch.
a. If the transfer switch is in the Normal position, place
standby engine starting control in the off position.
Then open the emergency source circuit breaker.
b. If the transfer switch is in the Emergency position,
open the normal source circuit breaker. Place the
engine starting control in the test or run position.
2. Separate the quick disconnect plugs by squeezing the
latches. Do not pull on the harness wires.
Transfer Switch Test
3. Label, remove, and tape the signal wires connected
to the engine start terminals on the transfer switch:
TB1 and TB3, or TB1 and TB2.
1. Press and hold the door-mounted Transfer Test
button until the engine starts and runs. This
should happen within 15 seconds.
2. The transfer switch will operate to the Emergency
position. If the Transfer To Emergency Delay is
used, the transfer will occur after a time delay
(up to 5 minutes). For immediate transfer press
Bypass Time Delay button.
3. The Transfer Switch will operate back to the
Normal position after the Retransfer To Normal
Delay (up to 30 minutes). For immediate
retransfer press Bypass Time Delay button.
4. Unloaded Running (Engine Cooldown) Delay
allows engine to run unloaded for 5 minutes.
Reconnecting the Plugs
Do not reconnect the controller until step
1a. or 1b. and 2 below are completed.
1. Observe the position of the transfer switch.
a. If the transfer switch is in the Normal position, be
sure that the standby engine starting control is still
in the off position. The emergency source circuit
breaker still should be open.
b. If the transfer switch is in the Emergency position,
normal source circuit breaker still should be open.
2. Reconnect the signal wires connected to the
appropriate engine start terminals on the transfer
switch. See Section 1, Engine Starting Contacts.
Clean and inspect the switch once a year. De-energize all
sources, then brush and vacuum away any excessive dust
accumulation. Remove the transfer switch barriers and
check contact condition. Replace contacts when pitted or
worn excessively. Reinstall the barriers carefully.
3. The harness plugs and sockets are keyed. Carefully
align the plugs with the sockets and press straight in
until both latches click.
Maintain transfer switch lubrication. The transfer
switch has been properly lubricated, and under normal
operating conditions no further lubricating is required.
Renew factory lubrication if the switch is subjected to
severe dust or abnormal operating conditions.
Relubricate the operator if TS coil is replaced. Order
lubrication kit 75-100.
4. Restore the opposite source as follows:
a. If the transfer switch is in the Normal position,
place the standby engine starting control in the
automatic position. Then close the emergency
source circuit breaker.
Replacement parts. Replacement parts are available in
kit form. When ordering parts provide the Serial No. and
Catalog No. from the transfer switch nameplate. Contact
your local ASCO Power Technologies sales office,
representative, or ASI. In the United States call
1–800–800–ASCO (2726), or in Canada call
1–888–234–ASCO (2726).
b. If the transfer switch is in the Emergency position,
close the normal source circuit breaker. The load will
be automatically retransferred to the normal source
after the Retransfer to Normal Delay. For immediate
retransfer, press Bypass Time Delay button. Place the
engine starting control in the automatic position.
3---1
TESTING & SERVICE (continued)
MANUAL LOAD TRANSFER
1. Open normal and emergency source circuit breakers.
This procedure will manually transfer the load if the
controller is disconnected.
2. Use the maintenance handle to manually operate
transfer switch to the opposite source. See page 1–3,
Manual Operation Test.
Do not manually operate the transfer switch
until both power sources are disconnected:
open both circuit breakers.
3. If the transfer switch is in the Emergency position
manually start the engine generator and then close
the emergency source circuit breaker.
TROUBLE-SHOOTING
Note the control features that are activated or furnished
on the switch and review their operation. Refer to Section
5, Control Features.
Proceed with care!
The automatic transfer switch is energized.
Table 3-1. Trouble-Shooting Checks.
PROBLEM
Gen-Set does not start when
the Transfer Test button is
pressed and held for 15
seconds or when the normal
source fails.
CHECK IN NUMERICAL SEQUENCE
1 OPERATION
2 GEN-SET
Hold the Transfer Test button Starting control must be in
15 sec. or the outage must be automatic position. Batteries
long enough to allow for the 1 must be charged and
or 3 sec. Momentary Normal
connected. Check wiring to
Source Outage Delay plus
engine starting contacts.
engine cranking and starting
time.
Transfer switch does not
transfer the load to
emergency source after the
gen-set starts.
Wait for Transfer to Emergency Delay (0 to 5 min.) to time
out. For immediate transfer,
press the Bypass Time Delay
button. If Motor Load Transfer
is active, wait for inphase condition (see below).
Transfer switch does not
transfer the load to normal
source when normal returns
or when Transfer Test button
is released.
Wait for Retransfer to Normal
Delay (1 sec. to 30 min.) to
time out. For immediate re–
transfer, press Bypass Time
Delay button. If Motor Load
Transfer is active, wait for inphase condition (see below).
Gen-Set does not stop after
load retransfer to the normal
source.
Wait for the 5 minute
Unloaded Running Delay to
time out.
Generator output circuit
breaker must be closed.
Generator frequency must be
at least 57 Hz.
—
3 VOLTAGE
—
Voltmeter should read at least
90% of nominal phase to
phase voltage between
transfer switch terminals EA
and EC (or EL1 and EL2 for 2
pole switches). *
* These are factory settings.
Voltmeter should read at least
90% of nominal phase to
phase voltage between
transfer switch terminals NB
and NC, NC and NA, and NA
and NB (or NL1 and NL2 for 2
pole switches).
Starting control must be in
automatic position.
—
Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–4)
3. Press and hold Transfer Test button. The load should
transfer to emergency source when meter needle is
near 0 volts. If transfer does not occur, Motor Load
Transfer feature is not operating.
4. Release the Transfer Test button. The load should
retransfer back to the normal source after the
Retransfer to Normal Delay, if used. The retransfer
should occur when the needle is near 0 volts. If
retransfer does not occur after the time delay, the
Motor Load Transfer feature is not operating.
5. For immediate retransfer, press the Bypass Time
Delay button. Then disconnect the voltmeter.
Use extreme caution when using a meter
to measure voltages in the following
steps. Do not touch power terminals;
shock, burns, or death could result !
1. Connect a voltmeter (set for twice system
phase–to–phase voltage) between Transfer Switch
terminals NA and EA.
2. Manually start generator. Voltmeter needle should
sweep back and forth at a regular rate between 0 and
about twice system voltage.
If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies
sales office, representative, or ASI. In United States, call 1–800–800–2726 or email customercare@asco.com. In Canada,
call 1–888–234–2726. Furnish the Serial No., Bill of Material (BOM) No., & Catalog No. from transfer switch nameplate.
3---2
SECTION 4 ADJUSTMENTS
Time Delay Adjustment
To change a setting, follow procedure on page 4-2. Use
Table 4-1 as a guide to time delay values and their corresponding adjustment DIP switch or potentiometer.
Standard time delays are set to customer specifications
(if none specified, standard factory settings are used).
Table 4-1. Time Delay Settings
DESCRIPTION
LABELS
FACTORY
SETTING
Override Momentary
Normal Source Outages
TD ES
3 seconds
Transfer to Emergency
TIMER
N/E
Override Momentary
Emergency S. Outages
ADJUSTMENT
RANGE
S3 DIP
SWITCH
ADJUSTMENT
POTENTIOMETER
Actuator 1 on
3 seconds
Actuator 1 off
0 minutes
(full ccw)
0 to 5
minutes
—
—
P2
—
4 seconds
non-adjustable
—
—
—
Retransfer to Normal
TIMER
E/N
30 minutes
(full cw)
1 second to
30 minutes
—
—
P1
Unloaded Running
(Engine Cooldown)
—
5 minutes
non-adjustable
—
—
—
1
1 second
—
1
Sensor Adjustments
Voltage and frequency sensor pickup and dropout points
are set to customer specifications (if none specified,
standard factory settings are used). To change a setting,
follow procedure on page 4–2. Use Tables 4-2 and 4–3 for
settings and corresponding DIP switch actuators.
Any change in these settings may affect the
normal operation of the automatic transfer
switch. This change could allow the load circuits
to remain connected to a low voltage source.
Table 4-2. Voltage and Frequency Settings. (
DESCRIPTION
PU / N
Pickup
90 %
95 % *
Actuator 3 off
90 %
Actuator 3 on
80 %
Emergency Source
Voltage
60 / 50 Hz
60 Hz
3 1
3,
3/1
3
––
––
60 Hz
Actuator 4 off
50 Hz
Actuator 4 on
3 phase
Actuator 6 off
1 phase
Actuator 6 on
6
60 / 50
Hz
non-adjustable
non-adjustable
non-adjustable
non-adjustable
6
90 %
75 %
95 %
85 %
4
Voltage Phases
Pickup
Dropout
Pickup
Dropout
4
Emergency Source
Frequency
eque cy
––
––
––
––
1 2
70 %
1 2
85 %
Dropout
1 2
85 %
DO / N
Actuator 1 off
Actuator 2 off
Actuator 1 on
Actuator 2 off
Actuator 1 off
Actuator 2 on
Actuator 1 on
Actuator 2 on
1 2
90 % *
Normal Source Voltage
S1 DIP
SWITCH
3
SETTING
3
LABELS
Shaded DIP switches are standard factory settings).
% of nominal
FACT. SET
ADJ RANGE
* If dropout voltage is set to 90%, the pickup voltage must be set to 95%.
Table 4-3. Transformer Voltage Adjust.
(Low setting shifts all voltage settings down 4.2%; for example, 240 V to 230 V, or 480 V to 460 V)
FACTORY SETTING
Voltage Adjust (4.2%)
(4 2%)
LOW /
HI
HI
4---1
ADJUSTMENT
S3 DIP SWITCH
LOW
Actuator 2 off
HI
Actuator 2 on
2
LABELS
2
DESCRIPTION
ADJUSTMENTS
(continued)
cover
Do not make any setting changes
while the controller is energized.
thumb
latch
How to Change a Setting
1. Prevent the transfer switch from operating by disconnecting one source first, then the other, as follows:
a.
b.
hook on
left side
If the transfer switch is in the Normal position,
open the emergency source circuit breaker. Turn
the engine starting control to off. Then open the
normal source circuit breaker.
Figure 4-1. Controller cover latch.
If the transfer switch is in the Emergency
position, open the normal source circuit breaker.
Turn engine starting control to test or run. Then
open the emergency source circuit breaker.
9 volt
alkaline
battery
2. Disconnect both harness plugs from controller by
squeezing the latches. Do not pull on the wires.
3. Remove cover from the controller by releasing latch
on right side with your thumb. See Figure 4-1.
J5 battery
on/off
jumper
harness
plugs
4. Locate the appropriate adjustment potentiometer or
DIP switch for the setting that you want to change.
Refer to Table 4-1 and Table 4–2 on page 4-1 and
Figure 4-2, Figure 4–3, Figure 4–4 on page 4–2.
P1
retransfer
to normal
time delay
5. Use a small screwdriver to turn the potentiometer
clockwise to increase the time delay or counterclockwise to decrease it. See Figure 4-3.
S1 DIP
switch
S2 DIP
switch
6. Use a ball-point pen (or similar pointed tool) to slide
the switch actuators left or right so they match the illustration next to the setting (left = off, right = on).
Recheck the setting. See Figure 4-4.
Figure 4-2. Location of potentiometers.
clockwise to
increase
P1 or P2
potentiometer
7. Install the cover on the controller by hooking it on
the left side and latching the right side.
8. Reconnect both harness plugs to the controller by
aligning and pressing straight in until latches click.
counterclockwise
to decrease
Figure 4-3. Changing time delay potentiometers.
Close the enclosure door.
9. Close the enclosure door, then restore both sources:
a.
If the transfer switch is in the Normal position
first close the normal source circuit breaker,
then close the emergency source circuit breaker.
b.
If the transfer switch is in the Emergency
position, close the normal source circuit breaker.
The load will be automatically retransferred to
the normal source. Then close the emergency
source circuit breaker.
P2
transfer to
emergency
time delay
S3 DIP
switch
DIP
switches
SW1
SW2
SW3
actuator
(8 on each DIP switch)
off
10. Turn the engine starting control to automatic.
on
Figure 4-4. Setting DIP switch actuators.
4---2
SECTION 5 CONTROL FEATURES – ENGINE EXERCISERS
These timers periodically exercise the emergency engine-generator plant. They can be set to exercise with or without
load transfer, or they can be completely disabled. The engine-generator should be exercised under load once a week for a
minimum time period of 20 minutes, or follow the recommendations of the engine-generator set manufacturer. Refer to
page 4–2 for location of DIP switches, battery (provided), and jumper block in the controller.
BUILT–IN ENGINE EXERCISER
DIP Switch Settings
5
8
Actuator
8 on
8
Fill in day and time set. Week Day ______ Time _______.
Actuator
8 off
S2 DIP
SWITCH
Actuator
5 on
Actuator
5 on
5
Std. Timer
Enabled
Std. Timer
Disabled
Exercise
without
Load
Exercise
with Load
7
S1 DIP
SWITCH
Actuator
7 on
Actuator
7 off
FUNCTION
7
The engine exerciser included in ASCO Series 300
Automatic Transfer Switches provides a once a week
20–minute exercise period. It occurs immediately when
the Set Engine Exerciser push button is pressed (and
held for at least 5 seconds), and then at the same time
weekly thereafter. A 9 volt alkaline battery (DuracellR
MN1604, EverreadyR 522, or PanasonicR 6AM6) is
furnished and installed in the controller to maintain the
setting. The battery jumper block must be shifted to the
ON position. See Figure 4–2 on page 4–2.
Shaded DIP switches are standard factory settings.
status light
Press to cancel an active exercise
period (stops generator).
Press and hold for 5 sec. or until status light
blinks rapidly to set exercise period immediately
and every week hereafter (generator starts).
If Exercise with Load is set, retransfers load to
Normal, then stops generator after min. cooldown.
Figure 5-1. Operator panel pushbuttons and light.
If Exerciser with Load is set,
transfers load to Emergency.
Select below either Exercise without Load or Exercise with Load according to the setting of DIP switch S1, actuator 8. The
load transfers from the Normal source to Emergency source (generator) and back again if Exercise with Load is selected.
Step
1
2
3
4
Push Button
Set Engine
Exerciser
hold 5 sec.
release
press Bypass
Time Delay
—
Explanation
blinks rapidly
●❍●❍●❍
set exercise period
Exercise the generator now and
every week at this time hereafter.
blinks slowly
●❍❍●❍❍
exercise period now active
Generator starts and runs.
● stays on
cancel active exercise period
Generator stops.
● stays on
generator off
Exerciser enabled; repeats every 7 days.
Status Light
8
Step
1
How to Set Built–In Timer
Function
Exercise with Load, DIP Switch S1, Actuator 8 on
Push Button
Set Engine
Exerciser
hold 5 sec.
8
Exercise without Load, DIP Switch S1, Actuator 8 off
How to Set Built–In Timer
Function
Explanation
blinks rapidly
●❍●❍●❍
set exercise period
Exercise the generator now and
every week at this time hereafter.
Status Light
2
release
blinks slowly
●❍❍●❍❍
exercise period now active
3
press Bypass
Time Delay
blinks slowly
●❍❍●❍❍
cancel active exercise period
4
—
● stays on
generator off
Generator starts and runs;
the load transfers to Emergency.
The load retransfers to Normal; then
generator runs for 5 minute cooldown
( light blinks slowly during cooldown ).
Exerciser enabled; repeats every 7 days.
NOTE: Every time SET ENGINE EXERCISER push button is pressed (held 5 seconds) the exercise period is changed.
5---1
CONTROL FEATURES (continued)
Optional Accessory 11BG – SOURCE AVAILABILITY SIGNAL
& PROGRAMMABLE ENGINE EXERCISER MODULE
2–line
display
connections
for source
availability
signal contacts
3 buttons
Figure 5–2. Accessory 11BG module (mounted behind operator interface and connected to the controller)
includes source availability signal contacts and a programmable engine exerciser.
Source Availability Signal Contacts
The module provides one Form C contact each for the
normal and emergency sources signal the acceptability of
the source as sensed by the controller. The signal contacts
operate in conjunction with the Source Accepted lights on
the operator interface. Field wiring terminals are
provided as shown in Figure 5–3 and the wiring diagram.
SOURCE
AVAILABILITY SIGNALS
2 AMPS @ 30 VDC, resistive
0.5 AMP @ 125 VAC, resistive
contacts shown de–energized
Contact ratings:
2 amps @ 30 Vdc, 0.5 amp. @ 125 Vac resistive
Figure 5–3. Source availability signal contacts.
Programmable Engine Exerciser
(see page 4–2)
5
Actuator
8 on
S2 DIP
SWITCH
Actuator
5 off
Actuator
5 on
5
Actuator
8 off
8
Opt. Timer
Enabled
Opt. Timer
Disabled
Exercise
without
Load
Exercise
with
Load
S1 DIP
SWITCH
Actuator
7 off
Actuator
7 off
8
FUNCTION
7
The programmable engine exerciser incorporates a 7 day
or 14 day time base. Proper controller settings must be
made to determine whether or not the test will be done
with or without load transfer (S1 DIP switch actuator 8).
DIP Switch Settings in the Controller
7
The module includes a programmable engine exerciser
that provides for weekly or biweekly operation. This
optional exercise timer may have to be turned on
(enabled) by setting the S1 DIP switch actuator 7 to off,
and S2 DIP switch actuator 5 to off. A backup battery in
the controller (see page 4–2 and page 5–3) must be turned
on to maintain the settings and to allow programming with
the normal and emergency power turned off (page 5–1).
Shaded DIP switches are standard factory settings.
See next page for instructions on setting the timer.
5---2
CONTROL FEATURES (continued)
How to Set Optional Programmable Engine Exerciser (part of Acc. 11BG module)
For example, if the user wants the exerciser to run every
other Saturday at 3 PM, the proper configuration would
be:
“Alt Sat @ 15:00”
NOTE: When choosing bi–weekly operation, the
exerciser will always run on the week designated “(1)” on
the date display.
Hazardous voltage capable of causing shock,
burns, or death is used in this transfer switch.
Deenergize both Normal & Emergency power
sources before programming the exerciser.
Navigating the Menu
Use the UP and DOWN arrow
keys to move through the displays.
Changing the Parameters
Use the UP and DOWN arrow
keys to move though the displays
to the parameter to be changed.
Push the ENTER key to start the
editing process. The first
parameter will flash. Use the UP
and DOWN arrow keys to adjust
the parameter to the desired
value and press the ENTER key
to save the value. The next
parameter will now flash. Repeat
the process until each parameter
is properly configured.
Run Time Display
Fast/Slow Adjust
The Run Time Display shows the run time for the engine
exerciser. The default setting from the factory is 30
minutes.
Daylight Saving
Time Adjust
Time Display
The Time Display shows the present system time. The
format is “hours:minutes:seconds”.
Date
NOTE: During total power outages, power to the
accessory is maintained by a battery in the Controller (see
page 4–2). Be sure that the 9–volt alkaline battery is fresh
and enabled (jumper in ON position) so that the time and
date settings are not lost.
Time
Run TIme
Date Display
The Date Display shows the present system date. The
format is “day of week (week) month/day of month/year”.
Start TIme
NOTE: Week is either week 1 or week 2. This is used in
conjunction with the bi–weekly timer.
Engine Exerciser
Daylight Savings Time Adjust Display
Engine Exerciser Display
The Engine Exerciser Display
shows the status of the engine
exerciser. When the unit is shipped from the factory the
programmable engine exerciser is “Disabled” and must be
set to “Enabled” by the customer. When the engine
exerciser is running, this display will count down the
remaining time until the end of the exercise period.
Start Time Display
The Start Time Display shows the engine exerciser start
time. There are four parameters that determine the start
time:
weekly (”Every”) or bi–weekly (”Alt”) operation
day of week (”Sun” through “Sat”)
start hour (0 through 23)
start minutes (0 through 59)
This display shows whether the automatic daylight saving
time adjustment is active. The factory default is “NO”. If
enabled, the unit will automatically adjust for daylight
saving time at 2 AM on the first Sunday of April and the
last Sunday of October.
Fast / Slow Adjust Display
This display shows the automatic fast/slow adjustment
value. The factory default is 0. This feature can be used to
trim a clock that runs fast or slow. For example, if your
clock runs 10 seconds slow per week, change the fast/slow
adjust value to “+10” and the unit will automatically add
10 seconds to the clock every week.
NOTE: Adjustments are made Sunday morning at 2 AM.
If you want your exerciser period to start at 2 AM on
Sunday, you cannot use this feature and the adjustment
must be set to 0.
Fill in your settings for future reference
Weekly or Bi–weekly
Every = weekly
Alt = bi–weekly
Day of Week
Start Time
0 – 23 hour
0 – 59 minute
Sun through Sat
Run Time
0 – 23 hour
0 – 59 minute
30 min. is default setting
Date exerciser was set ______________________________________
5---3
CONTROL FEATURES (continued)
INPHASE MONITOR
FOR MOTOR LOAD TRANSFER
LOAD DISCONNECT FEATURE
Inphase monitoring logic controls transfer and retransfer
of motor loads, so that inrush currents do not exceed
normal starting currents. It avoids nuisance tripping of
circuit breakers and mechanical damage to motor
couplings.
The Motor Load Transfer feature is built into the
controller. DIP switch S1 (actuator 5) activates this
feature: right = ON, left = OFF.
FUNCTION
S1 DIP SWITCH
disable
Actuator 5 off
The double throw (Form C) contact is rated for 28 VDC or
120 VAC (5 amps resistive). The contact operates prior to
a selectable 0, 3, 10, or 20 second delay before transfer of
the Automatic Transfer Switch. The contact resets either
immediately following transfer or after the same delay as
set for pre–signal before transfer.
Time delay between the load disconnect control signal
and initiation of transfer is set on the controller with DIP
switch S2 (actuators 6, 7, 8) as shown below:
Delay Before Transfer
5
Actuator 5 on
5
enable
Connect external circuits to the terminals indicated on the
Wiring Diagram provided with the ATS.
LD TDBT
0 (disable)
3 seconds
10 seconds
7 8
20 seconds
7 8
If the Motor Load Transfer feature is enabled,
it will be activated following the Load
Disconnect Feature Delay Before Transfer
delay.
7 8
Note
S2 DIP SWITCH
Actuator 7 on
Actuator 8 on
Actuator 7 on
Actuator 8 off
Actuator 7 off
Actuator 8 on
Actuator 7 off
Actuator 8 off
7 8
Shaded DIP switches are standard factory settings.
Shaded DIP switches are standard factory settings.
Delay After Transfer*
LD TDAT
S2 DIP SWITCH
enable
Actuator 6 on
6
disable
Actuator 6 off
6
*Enabling the Delay After Transfer will cause the control
signal to reset after the same delay as set for the Delay
Before Transfer.
REMOTE CONTROL FEATURES
These remote control features require a customer–supplied normally closed contact suitable for a 5 V dc low energy
circuit. Refer to the Wiring Diagram provided with the ATS. Activate appropriate DIP switch S2 actuators below.
Remote Test (terminals CP6–7)
RTSW
Remote Transfer to Emergency (CP8–9)
S2 DIP SWITCH
enable
Actuator 2 off
2
Actuator 3 off
Bypass Transfer Time Delay (CP12–13)
TD E/N BYP.
Inhibit Transfer to Emergency (CP10–11)
S2 DIP SWITCH
Actuator 4 on
enable
Actuator 4 off
4
Actuator 1 off
disable
4
enable
S2 DIP SWITCH
1
Actuator 1 on
N/E INHIB.
1
disable
S2 DIP SWITCH
Actuator 2 on
2
enable
RT /E
disable
3
Actuator 3 on
3
disable
5---4
CONTROL FEATURES (continued)
OPTIONAL STRIP HEATER (Accessory 44)
Accessory 44 Strip Heater is designed to keep ambient
temperatures within the Automatic Transfer Switch
enclosure at acceptable levels. This accessory consists of a
mounting bracket with strip heater, thermostat, and
terminal block. A transformer with fuses is included when
the power for the assembly is derived from voltages above
120 V ac. The 120 V ac customer powered assembly does
not include a transformer. This optional accessory is
available factory installed or in kit form.
thermostat
dial
turn counterclockwise
to lower temperature
Turn the thermostat’s dial to required setting as shown.
turn clockwise
to raise temperature
Figure 5–4. Thermostat.
AVAILABLE KITS FROM ASCO
Controls
Strip Heater – Accessory 44
Description
Accessory
Kit
Description
Accessory
Kit
Programmable Engine Exerciser
& Source Availability Contacts
11BG
K629830
120 volt
customer supplied voltage
(without transformer)
44A
K613127–001
Serial Communication Module
72A
K601110
208 – 480 volt
ATS derived voltage
(with transformer)
44G
K613127–002
380 volt
ATS derived voltage
(with transformer)
44G
K613127
550 – 600 volt
ATS derived voltage
(with transformer)
44G
K613127–003
5---5
A
accessories, 5–2, 5–5
auxiliary circuits, 1–2
B
battery, 4–2, 5–1
buttons, push, 3–1
bypass time delay, 1–5, 2–1, 3–1
C
G
INDEX
strip heater, 5–5
P
ground, controller, 1–1
H
parts, 3–1
problem, 3–2
handle, maintenance, 1–3
warning, 1–3
programmable engine exerciser, 5–2,
5–3
harness, 1–2
disconnect plugs, 3–1
R
HELP
800–800–2726 (ASCO)
customercare@asco.com
rating label, cover
cable
lugs, 1–1
preparation, 1–1
inphase monitor, 5–4
catalog number, inside cover
remote control features, 5–4
bypass transfer time delay, 5–4
inhibit transfer to emergency, 5–4
remote test, 5–4
remote transfer to emergency, 5–4
inspection, 3–1
replacement parts, 3–1
cleaning, 3–1
installation, 1–1
connections
engine control contact, 1–2
line, 1–1
contact position indicators, 1–3
contacts
auxiliary, 1–2
engine control, 1–2
main, 1–3, 3–1
source availability signal, 5–2
control features, 5–1
load disconnect, 5–4
motor load transfer, 5–4
plant exerciser, 5–1, 5–2, 5–3
controller, 4–1, 4–2
codes, cover
cover removal, 4–2
disconnecting, 3–1
time delay potentiometers, 4–2
D
DIP Switches, 4–1, 4–2, 5–1, 5–2, 5–4
E
electrical operation, 1–5
engine exerciser, 5–1, 5–2, 5–3
engine starting contacts, 1–2
F
features, see control features
frequency, pickup and dropout
settings, 4–1
functional test, 1–3, 1–4, 1–5
Printed in U.S.A.
I
S
L
service, call 800–800–2726 (ASCO)
labels,
engine starting contacts, 1–2
inputs / outputs, 1–2
rating, cover
set engine exerciser, 5–1, 5–2, 5–3
settings
changing, 4–1
factory, 4–1
frequency, 4–1
phase, 4–1
time delay, 4–1
voltage, 4–1
lights, 1–4, 5–1
load disconnect feature, 5–4
lubrication, 3–1
M
source accepted lights, 1–4, 1–5
maintenance, preventive, 3–1
T
manual load transfer, 3–2
warning, 3–2
terminal block, 1–2
test, functional, 1–3, 1–4, 1–5
manual operation, 1–3
warning, 1–3
time delay
adjustment, 4–1
gen–set cooldown, 4–1
how to change, 4–2
override momentary outages, 4–1
transfer to emergency, 4–1
transfer to normal, 4–1
motor load transfer feature, 5–4
N
nameplate, cover
O
timer (plant exerciser), how to set,
5–1, 5–2, 5–3
operation
electrical, 1–5
manual, 1–3
illustration of, 1–3
warning, 1–3
sequence of, 2–1
transfer switch position lights, 1–4,
1–5
transfer test, 1–5, 3–1
trouble–shooting, 3–2
optional accessories
programmable engine exerciser
& source availability signal
contacts, 5–2, 5–3
serial communication module, 5–5
V
voltage, phase, 4–1
voltage, pickup and dropout settings,
4–1
Copyright --- ASCO Power Technologies, L.P. 2007