Page 1
Installation Manual ASCO 3ATS, 3ADTS, 3NTS, 3NDTS
E
Installation Manual
G-design 1600-3000 A Transfer Switches
DANGER
!
DANGER is used in this manual to warn of a
hazard situation which, if not avoided, will result in
death or serious injury.
WARNING
!
WARNING is used in this manual to warn of a
hazardous situation which, if not avoided, could
result death or serious injury.
CAUTION
!
CAUTION is used in this manual to warn of a
hazardous situation which, if not avoided, could
result in minor or moderate injury.
Refer to the outline and wiring drawings provided
with the 3ATS, 3NTS, 3ADTS, or 3NDTS for all
installation and connection details and accessories.
Refer to User’s Guide 381333-400 for the Goup G
Controller status display messages, time delays,
pickup and dropout settings, and adjustments.
Rating Label
Each 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.
WARNING
!
Do not exceed the values on the rating label.
Exceeding the rating can cause person injury or
serious equipment damage.
An experienced licensed electrician must install the transfer
switch.
Installation
These transfer switches are factory wired and tested.
Installation requires mounting, connecting service cables, and
connecting engine start and auxiliary control circuits (if
required.).
3ATS, 3ADTS, 3NTS, 3NDTS
Table of Contents
INSTALLATION
Mounting .......................................................... 1
Power Connections .........................................2
Engine Starting Contacts.................................2
FUNCTIONAL TEST
1- Manual Operation........................................3
2- Voltage Checks ...........................................4
3- Electrical Operation .....................................6
TESTING & SERVICE
Transfer Test ...................................................6
Preventive Maintenance ..................................6
Manual Load Transfer .....................................6
TROUBLESHOOTING ....................................7
INDEX..............................................................8
Supporting Foundation
The supporting foundation for the enclosure must be level and
straight. Refer to the applicable enclosure outline drawing
included with the transfer switch for all mounting details
including door opening space.
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 1 inch minimum 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.
Mounting
Refer to the outline and mounting diagram and mount the
transfer switch according to details and instructions shown on
the diagram. Mount it vertically to a rigid supporting
structure. Level all mounting points by using flat washers
behind the holes to avoid distortion of the transfer switch.
NOTIC
Protect the transfer switch from construction grit
and metal chips to prevent malfunction or
shortened life of the transfer switch.
381333-406
381333-406 ASCO Power Technologies Page 1
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ASCO 3ATS, 3ADTS, 3NTS, 3NDTS Installation Manual
Line Connections
Refer to the wiring diagram provided with the transfer switch.
All wiring must be made in accordance with the National
Electrical Code and local codes.
DANGER
!
De-energize the conductors before making any line
or auxiliary circuit connections. Be sure that the
Normal and Emergency line connections are in
proper phase rotation. Place the engine generator
starting control in the OFF position. Make sure
engine generator is not in operation.
Testing Power Conductors
Do not connect the power conductors to the 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.
Connecting Power Cables
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 the transfer switch. Make
sure that 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 transfer switch. 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.
Harnesses
The transfer switch is connected to the left side of the
controller by a plug-in harness (two plugs).
Auxiliary Circuits
Connect auxiliary circuit wires to appropriate terminals on the
transfer switch as shown on the wiring diagram.
Controller Ground
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.
Engine Starting Contacts
The engine control contact connections (if used) are located on
the transfer switch for 3ATS & 3NTS or in the upper right
side of the enclosure for 3ADTS & 3NDTS. Connect signal
wires to appropriate terminals as specified in Table A and
shown in Figure 1.
Table A. Engine Start Connections.
When normal
source fails
contact closes TB1 and TB2
contact opens TB1 and TB3
TB
Figure 1. Engine start and auxiliary circuit terminal block.
Emergency
contacts
window
indicators
OPEN or
CLOSED
Normal
contacts
Figure 2. Main contact position indicators on right side.
Terminals on
transfer switch
Page 2 ASCO Power Technologies 381333-406
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Installation Manual ASCO 3ATS, 3ADTS, 3NTS, 3NDTS
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 transfer switch.
A maintenance handle is provided on 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. After deenergizing both power sources, open the enclosure
2. Install the handle into the hole in the molded hub. Move
3. 3ADTS and 3NTS have two contact shaft hubs. See
4. Return the transfer switch to the Normal position.
Note: If Normal and Emergency connections are reversed this
operation is also reversed.
NOTICE
1 – Manual Operation
WARNING
!
door. Locate and remove the maintenance handle from the
clip on the left side of the transfer switch. See Figures 3, 4,
and 5. See Figure 2 for the contact position indicators.
the 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.
Figure 5.
maintenance
Figure 3. Maintenance handle on 3ATS & 3NTS.
Counterclockwise DOWN
closes the Emergency
source contacts (upper)
and opens the Normal
source contacts (lower)
Clockwise DOWN closes
the Normal source
contacts (lower) and
opens the Emergency
source contacts (upper)
Figure 4. Maintenance handle operation on 3ATS &
3NTS.
maintenance handle
insert handle into
hole in hub
slide hub onto shaft
and insert the pin
381333-406 ASCO Power Technologies Page 3
Counterclockwise DOWN
OPENS the contacts
shaft to open
Pull out
Emergency source contacts
(upper)
Push in
source contacts (lower)
shaft to open Normal
Clockwise DOWN CLOSES
the contacts
Pull out
shaft to close
Emergency source contacts
(upper)
Push in
shaft to close
Normal source contacts
(lower)
Figure 5. Maintenance handle on 3ADTS & 3NDTS.
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ASCO 3ATS, 3ADTS, 3NTS, 3NDTS Installation Manual
y
p
Close the normal source circuit breaker. The
normal source accepted and the load on normal
lights should come on.
1
Use an accurate voltmeter to
check phase to phase and
2
phase to neutral voltages
present at the transfer switch
normal source terminals.
Close the emergency source circuit breaker.
(Start generator, if necessary.) The emergency
source accepted light should come on.
3
Normal Source
Acce
ted
Load on
Normal
Load on
Emergenc
Emergency
Source Accepted
Figure 6. Four indicator lights.
2 – Voltage Checks
First check the nameplate on the transfer switch; rated voltage
must be the same as normal and emergency line voltages.
DANGER
!
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 indicator
lights. See Figure 6.
* If necessary, adjust the voltage regulator on the generator
according to the manufacturer’s recommendations. The
transfer switch will respond only to the rated voltage specified
on the transfer switch nameplate.
● Black circle means the light is on.
○ White circle means the light is off.
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
emergency source; it must be
5
the same
at the normal
source.
Shut down the engine-generator, if applicable.
The emergency source accepted light should go
off. Then put the starting control selector switch
(on the generator set) in the automatic position.
6
Close the enclosure door.
Continue to 3 – Electrical Operation on the next page.
Also see User’s Guide 381333-400 for voltage settings in the
controller.
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Installation Manual ASCO 3ATS, 3ADTS, 3NTS, 3NDTS
The normal source must be available and the generator
must be ready to start. Check that the normal source
accepted light is on.
1
For 3ATS & 3ADTS press the transfer
button. The engine should start and run
within 15 seconds. For 3NTS & 3NDTS
the generator must be started manually
at the generator.
2
The emergency source accepted light should come on.
Press this
button
Observe
these
lights
Figure 7. Transfer button and indicator lights.
3 – Electrical Operation
This procedure will check the electrical operation of the
transfer switch.
WARNING
!
Close the transfer switch enclosure door and
tighten the screws before you test electrical
operation.
Perform steps 1 through 5 at the right. Observe the status
lights. See Figure 7.
NOTE: For 3NTS manually start the emergency generator at
the generator. Then press the transfer button for load transfer.
If the inphase transfer feature is activated, transfer may not
occur immediately. Transfer will occur when the phase
relationship between sources is correct. Press the transfer
button again for load retransfer to normal, then manually stop
the generator at the generator.
Also see User’s Guide 381333-400 for inphase transfer and
time delay settings in the controller.
This completes the functional test of the transfer switch.
Leave the engine-generator starting control in the automatic
position.
● Black circle means light is on.
○ White circle means light is off.
For 3ATS & 3ADTS the transfer switch should transfer to
the emergency position. The load on emergency light
should come on and the load on normal light should go
off. For 3NTS & 3NDTS press the transfer button for
load transfer. For 3ADTS & 3NDTS both lights will be off
during the delayed-transition transfer time delay.
If the transfer to emergency delay is
3
used, the transfer occurs after a time
delay. For immediate transfer (bypass
timer) press the transfer button again.
For 3ATS & 3ADTS the transfer switch should transfer
back to the normal position. The load on normal light
should come on and the load on emergency light should
go off. For 3NTS & 3NDTS press the transfer button for
load retransfer. For 3ADTS & 3NDTS both lights will be
off during the delayed-transition transfer time delay.
If the retransfer to normal delay is used
4
the retransfer should occur after a time
delay. For immediate retransfer (bypass
timer) press the transfer button again.
For 3ATS & 3ADTS the unloaded running delay keeps
the generator running for a cool-down period. Then the
generator should stop and the emergency source
accepted light should go off. For 3NTS & 3NDTS
manually stop the generator at the generator (after a
5
cool-down period).
381333-406 ASCO Power Technologies Page 5
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ASCO 3ATS, 3ADTS, 3NTS, 3NDTS Installation Manual
Testing & Service
Transfer Test
Operate the transfer switch at least once a month by following
the Electrical Operation procedure on page 6.
Preventive Maintenance
Reasonable care in preventive maintenance will insure high
reliability and long life for the transfer switch. An annual
preventive maintenance program is recommended.
ASCO Services, Inc. (ASI) is ASCO Power
Technologies’ national service organization.
ASI can be contacted at 1-800-800-2726 for
information on preventive maintenance agreements.
Yearly Inspection
DANGER
!
Hazardous voltage capable of causing shock,
burns, or death is used in this transfer switch.
Deenergize both Normal & Emergency power
sources before performing inspections!
Clean the enclosure. Deenergize all sources, then brush
and vacuum away any excessive dust accumulation. Remove
moisture with a clean cloth.
Inspect the transfer switch contacts. Deenergize all
sources, then remove the transfer switch barriers and check the
contact condition. Replace contacts when pitted or worn
excessively. Reinstall the barriers carefully.
Maintain transfer switch lubrication. Under normal
operating conditions no further lubricating is required. Renew
factory lubrication if the transfer switch is subjected to severe
dust, abnormal operating conditions, or if the TS coil is
replaced. Order lubrication kit 75-100.
Check all cable connections & retighten them.
Torque to values shown on the transfer switch label.
Replacement Parts
When ordering replacement parts provide the Serial No., Bill
of Material No. (BOM), and Catalog No. from the transfer
switch nameplate. In the US call 800-800-2726 (ASCO) or
contact customercare@asco.com.
Manual Load Transfer
This procedure will manually transfer the load if the controller
is disconnected.
WARNING
!
Do not manually operate the transfer switch until
both power sources are disconnected: open both
circuit breakers.
1. Deenergize both the normal and emergency source (open
2. Use the maintenance handle to manually operate the
3. Close the enclosure door. If the transfer switch is in the
both circuit breakers).
transfer switch to the opposite source. See pages 3 and 4,
Manual Operation.
emergency position, manually start the generator and then
close the emergency source circuit breaker.
Page 6 ASCO Power Technologies 381333-406
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Installation Manual ASCO 3ATS, 3ADTS, 3NTS, 3NDTS
Troubleshooting
Check in Numerical Sequence
Problem
1 Operation 2 Generator 3 Voltage
For 3ATS & 3ADTS the enginegenerator set does not start when
the transfer test button is pressed
or when the Normal source fails.
For 3ATS & 3ADTS the transfer
switch does not transfer the load
to the emergency source after the
gen-set starts.
For 3ATS & 3ADTS the transfer
switch does not transfer the load
to normal source when normal
returns or after transfer test.
For 3ATS & 3ADTS the
generator does not stop after load
retransfer to the normal source.
The outage must be long
enough to allow for the
feature 1C time delay plus
engine cranking and starting
time.
Wait for the feature 2B time
delay. For immediate
transfer, press the transfer
button (bypass timer). If
inphase transfer is active,
wait for inphase condition.
For 3NTS & 3NDTS press
the transfer button.
Wait for the feature 3A time
delay. For immediate
retransfer, press the transfer
button (bypass timer). If
inphase transfer is active,
wait for inphase condition.
For 3NTS & 3NDTS press
the transfer button.
Wait for the feature 2E
delay.
Starting control must be
in automatic position.
Batteries must be
charged and connected.
Check wiring to the
engine starting contacts.
Is the generator
accepted light on?
Generator output circuit
breaker must be closed.
Generator frequency
must be correct.
-
Starting control must be
in automatic position.
-
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). *
* There 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).
-
For 3ADTS & 3ADTS the load is
deenergized (off). Load
Disconnect Timer on display.
Not in auto light is always on.
Alert light is on.
381333-406 ASCO Power Technologies Page 7
Wait for the delayedtransition transfer timer. See
User’s Guide 381333-400.
For 3NTS & 3NDTS this
light is always on, indicating
it is a manual transfer
switch.
Read the display for more
information. Refer to
User’s Guide 381333-400.
-
- -
- -
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ASCO 3ATS, 3ADTS, 3NTS, 3NDTS Installation Manual
INDEX
A
alert light, 7
see User’s Guide 381333-400
ASI is ASCO Services Inc.
800-800-2726(ASCO)
customercare@asco.com
automatic operation, 3ATS, 5
auxiliary circuits, 2
B
battery, 7
C
cables, power, 2
connections, 2
controller
see User’s Guide 381333-400
controller ground, 3
cooldown, generator, 5, 7
D
DANGER statements, 1, 2, 4, 6
E
electrical operation, 5
emergency source accepted light,
4, 5
engine starting contacts, 2
F
foundation, 2
frequency, 7
functional test, 3
G
generator, 3, 4, 5, 7
ground, controller, 2
H
harness, 2
HELP 800-800-2726(ASCO)
customercare@asco.com
I
inphase transfer feature, 5, 7
inspection, 6
installation, 2
insulator backing piece, 2
WARNING, 2
L
lights, 4, 5, 7
line connections, 2
load on emergency light, 4, 5
load on normal light, 4, 5
lubrication, 6
M
maintenance, 6
maintenance handle, 3, 6
WARNING, 3, 6
manual load transfer, 6
WARNING, 3, 6
manual operation, 3
WARNING, 3, 6
manual transfer, 3NTS, 5
membrane controls, 4, 5
mounting, 2
N
non-automatic 3NTS, 5, 7
normal source accepted light, 4, 5
not in auto light, 7
O
operation, electrical, 5
P
phase rotation, 4
preventive maintenance, 6
problem, 7
R
rating label, 1
replacement parts, 6
retransfer button, 5, 7
S
source acceptable lights, 4, 5
starting contacts, 3
starting control, 7
starting problem, 4, 7
stopping problem, 7
T
terminals, 2, 3
testing power conductors, 2
time delays, 5, 7
transfer button, 5, 7
transfer problem, 7
troubleshooting, 7
V
voltage checks, 4, 7
W
WARNING statements, 1, 3, 5, 6
Printed in U.S.A. © ASCO Power Technologies, L.P. 2013
Page 8 ASCO Power Technologies 381333-406
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