THOMSON TS 870 - WITH TSC 80E CONTROLLER, TS 870 Service Manual

TS 870

AUTOMATIC TRANSFER SWITCHES

With TSC 80e Controller

INSTALLATION, OPERATING &

SERVICE MANUAL

PM062 Rev 8 10/01/25

9087A – 198th Street, Langley, BC Canada V1M 3B1 Ÿ Telephone [phone]

Telefax [phone] Ÿ E-Mail: [e-mail] Ÿ www.thomsontechnology.com

TS 870 TRANSFER SWITCH

TABLE OF CONTENTS

1. PRODUCT REVISION HISTORY 1

2. EQUIPMENT STORAGE 1

2.1. ENVIRONMENTAL CONDITIONS 1

3. NOTES TO INSTALLER 2

3.1. UPSTREAM CIRCUIT PROTECTIVE DEVICES/ELECTRICAL CONNECTIONS 2

3.2. TRANSFER SWITCHES WITH INTEGRAL OVER CURRENT PROTECTION 3

3.3. TRANSFER SWITCHES WITH MULTI-TAP VOLTAGE CAPABILITY 3

3.4. SYSTEM PHASING-HIGH LEG DELTA SYSTEMS 4

3.5. REMOTE START CONTACT FIELD WIRING 5

3.6. DIELECTRIC TESTING 5

3.7. INSTALLATION OF OPEN TYPE TRANSFER SWITCHES 5

3.8. MOUNTING OF ENCLOSED TRANSFER SWITCHES 6

4. GENERAL DESCRIPTION 8

4.1. PRODUCT MODEL CODE 10

4.2. TYPICAL COMMISSIONING PROCEDURES 11

5. GENERAL THEORY OF OPERATION 11

5.1. STANDARD AUTOMATIC TRANSFER SWITCH 11

5.2. SERVICE ENTRANCE AUTOMATIC TRANSFER SWITCH 12

5.3. TEST MODES 16

6. OVER CURRENT PROTECTION 16

6.1. STANDARD TS 870 AUTOMATIC TRANSFER SWITCH 16

6.2. OPTIONAL TS 870 AUTOMATIC TRANSFER SWITCH WITH INTEGRAL OVER
CURRENT PROTECTION 16

7. GENERAL NOTES ON SERVICING TRANSFER SWITCH MECHANISM 18

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8. TRANSFER SWITCH MECHANISM – 100A-800A, S STYLE 20

8.1. MANUAL OPERATION 20

9. TRANSFER SWITCH MECHANISM –1000A-1200A, T-STYLE 22

9.1. MANUAL OPERATION 22

10. RECOMMENDED MAINTENANCE 24

11. FRONT VIEW (TYPICAL) 3 / 4 POLE 100A-250A S-STYLE TRANSFER
MECHANISM 26

12. FRONT VIEW (TYPICAL) 3 POLE 400A-800A S-STYLE TRANSFER MECHANISM
(MECHANISM FRONT COVER REMOVED) 27

13. FRONT VIEW (TYPICAL) 3 / 4 POLE 1000A-1200A T-STYLE TRANSFER
MECHANISM 28

14. CONNECTION CONFIGURATION OPTIONS 29

15. CABLE TERMINAL INFORMATION 30

16. REQUIREMENTS FOR UPSTREAM CIRCUIT PROTECTIVE DEVICES 30

16.1. WITHSTAND CURRENT RATINGS (ALL MODELS WITHOUT INTEGRAL

OVERCURRENT PROTECTION OPTION) 30

16.2. INTERRUPTING CAPACITY CURRENT RATINGS (ALL MODELS WITH INTEGRAL

OVERCURRENT PROTECTION OPTION) 31

17. GROUND FAULT SITE TEST REQUIREMENTS 31

17.1. PERFORMANCE TEST 31

18. TROUBLESHOOTING 33

19. REPLACEMENT PARTS 36

20. PRODUCT RETURN POLICY 37

21. NOTES 38

22. PERFORMANCE TEST FORM 39

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1. PRODUCT REVISION HISTORY

The following information provides an historical summary of changes made to this product since
the original release.

Operating & Service Manual Version

Rev 0 04/11/19
Rev 1 05/03/08

Rev 2 05/05/26
Rev 3 06/05/08
Rev 4 07/07/31
Rev 5 08/03/05

Rev 6 08/08/01
Rev 7 09/01/01
Rev 8 10/01/25

Original release.
Changes to incorporate reversing style ATS Motor for 100-250A

transfer switches.
Revisions to Section 8 and Section 18.
Revisions to Section 15.
Changes to Incorporate new S-Style 400A mechanism
Changes to Incorporate new S-Style mechanism (100A, 150A,

200A, 250A, 600A, 800A)
Changes to Incorporate optional TSC 80E Transfer Controller
Changes to Incorporate standard TSC 80E Transfer Controller
Changes to Incorporate Seismic Certification and Mounting

Requirements

Contact Thomson Technology, to obtain applicable instruction manuals or if in doubt about
any matter relating to installation, operation or maintenance. Soft copy of the most current
version is available at www.thomsontechnology.com.

NOTE: All information contained in this manual is for reference only and is subject

to change without notice.

2. EQUIPMENT STORAGE

The following procedures are required for correct storage of the transfer switch prior to installation.

2.1. ENVIRONMENTAL CONDITIONS

CAUTION!!!

Failure to store and operate equipment under the specified environmental conditions may
cause equipment damage and void warranty.

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2.1.1. EQUIPMENT STORAGE

The transfer switch shall be stored in an environment with a temperature range not
exceeding -4° to +158° Fahrenheit (-20° to +70° Celsius) and a humidity range not
exceeding 5%-95% non-condensing. Before storing, unpack sufficiently to check for
concealed damage. If concealed damage is found, notify the ATS supplier and the
Carrier immediately. Repack with the original, or equivalent packing materials.
Protect from physical damage. Do not stack. Store indoors in a clean, dry, well
ventilated area free of corrosive agents including fumes, salt and concrete/cement
dust. Apply heat as necessary to prevent condensation.

2.1.2. EQUIPMENT OPERATING

The transfer switch shall be operated in an environment with a temperature range
not exceeding +5° to +122° Fahrenheit (-15° to +50° Celsius) and a humidity range
not exceeding 5%-95% non-condensing.

3. NOTES TO INSTALLER

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

3.1. UPSTREAM CIRCUIT PROTECTIVE DEVICES/ELECTRICAL
CONNECTIONS

To ensure satisfactory installation of this equipment be sure to observe "Cable Terminal
Information” regarding power cable connection tightness and "Requirements for Upstream

DANGER!!!!

Circuit Protective Devices" located in this manual.

All mechanical and electrical connections must be checked for tightness prior to placing this
equipment in service to ensure proper operation and to validate applicable warranty
coverage.

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3.2. TRANSFER SWITCHES WITH INTEGRAL OVER CURRENT PROTECTION

For models of transfer switch with integral over current protection, the over current
protection must be set prior to operation. The equipment will be shipped from the factory
with a long-time current setting of 100% (of the equipment rating) and maximum short­time/instantaneous current and time delay settings.

WARNING!

Do Not Energize this equipment until
device settings have been verified to
ensure proper system protection &
coordination. Failure to do so may
result in equipment failure.

Refer to Section 5.2.2 of this manual for additional information on operation of the Transfer
switch following an over current trip condition.

Refer to information supplied with the transfer switch documentation package for
adjustment procedures on the power switching units over current protection trip unit.
Contact the factory if any additional information is required.

3.3. TRANSFER SWITCHES WITH MULTI-TAP VOLTAGE CAPABILITY

If the transfer switch has programmable multi-tap voltage capability (i.e. ATS Model Code
with Voltage Code “Y”), confirm the transfer switch has been configured for the correct
system voltage prior to installation.

WARNING!

Failure to confirm and match transfer
switch voltage with the system voltage
could cause serious equipment damage.

The voltage selections and connections are shown on the engineered drawings attached to
each transfer switch. The factory default settings will be indicated on the calibration label
attached on the inside of the enclosure door (supplied loose on open style models). A
blank label is included to record the applicable settings if the configuration is changed from
the factory default settings.

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To change the transfer switch voltage, refer to “INSTRUCTIONS TO CHANGE SYSTEM

VOLTAGE ON TS870 SERIES TRANSFER SWITCHES WITH TSC 80E
CONTROLLER” (attached as “Appendix B). Contact Thomson Technology for further

information as may be required.

3.4. SYSTEM PHASING-HIGH LEG DELTA SYSTEMS

For systems using high leg delta 240V 3 phase 4 wire systems, connection of supply
conductors must have the correct phasing as shown below.

WARNING

Failure to match correct system
phasing will result in serious damage
to the TSC 80E controller.

Automatic Transfer

Switch (Utility Supply)

PH A

(UA)

PH B

(UB)

PH C

(UC)

Neural

(N)

B

(Orange)

(High Leg)

208V

C

(Yellow)

A

(Red)

240V 240V

120V 120V

N

(White)

Where transfer switches are supplied without power isolation transformers (PT1 &
PT2) for ATS control logic it is essential that the orientation of phase conductors of

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the supply source be arranged such that the phase of highest potential with respect
to ground is not connected to the power supply inputs to the controller (A Phase for
both supplies). Failure to do so will result in equipment damage.
Per NEC Article 384-3 (f) “The B phase shall be that phase having the higher
voltage to ground on a 3-phase, 4-wire delta connected systems.”

3.5. REMOTE START CONTACT FIELD WIRING

As a minimum, the remote engine start control field wiring shall conform to the local
regulatory authority on electrical installations. Field wiring of a remote start contact
from a transfer switch to a control panel should conform to the following guidelines
to avoid possible controller malfunction and/or damage.

3.5.1. Minimum #14 AWG (2.5mm2) wire size shall be used for distances up to

100ft (30m)1). For distances exceeding 100 ft. (30m) consult Thomson
Technology

3.5.2. Remote start contact wires should be run in a separate conduit.

3.5.3. Avoid wiring near AC power cables to prevent pick-up of induced voltages.

3.5.4. An interposing relay may be required if field-wiring distance is excessively

long (i.e. greater than 100 feet (30m)) and/or if a remote contact has a
resistance of greater than 5.0 ohms.

3.5.5. The remote start contact must be voltage free (i.e. dry contact). The use of a

“powered” contact will damage the transfer controller.

3.6. DIELECTRIC TESTING

Do not perform any high voltage dielectric testing on the transfer switch with the TSC
80E controller connected into the circuit as serious damage will occur to the
controller. All AC control fuses and control circuit isolation plugs connected to the
TSC 80E must be removed if high voltage dielectric testing is performed on the
transfer switch.

3.7. INSTALLATION OF OPEN TYPE TRANSFER SWITCHES

Please refer to the factory for additional information.

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3.8. MOUNTING OF ENCLOSED TRANSFER SWITCHES

Model TS840, TS870 and TS880 Automatic Transfer Switches and Automatic
Transfer and Bypass Isolation Switches in "standard" enclosures are seismic
certified under AC156 building code for non-structural components.
"Standard" enclosures are all transfer switch enclosures Thomson Technology offers
in NEMA 1, NEMA 2, NEMA 3R and NEMA 4X for the above listed product. If a
customer requests a custom enclosure it would not be covered under the generic
certificate; if certification were a requirement Consult factory before ordering.
The Automatic Transfer Switches are qualified to the highest known level in North
America; based on site class D. Specifically this is a spectral acceleration of 342%.
The transfer switch must be installed per the anchoring details provided for seismic
qualification. The equipment can be mounted in alternate means and still qualify if a
qualified Civil Engineer designs the alternate method of anchoring.

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Anchoring Notes:

1. Anchoring must be designed according to IBC 2006 or latest version.

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2. The anchoring details shown are recommended according to the seismic
certification; design Engineer may use alternate anchors within the scope of IBC.

3. Wall anchors in concrete; use a typical concrete anchor as necessary.

4. Expansion anchors as shown. To be installed according to manufacturer's
recommendation.

5. The 800-1200A NEMA 3R ATS enclosure may be floor/wall mounted or it may be
free standing (floor mounted only); If free standing it must be a minimum of 12"
(305mm) away from pipes, conduits or other obstructions to allow for sway during a
seismic event.

4. GENERAL DESCRIPTION

Thomson Technology TS 870 series of Automatic Transfer Switches employ two mechanically
interlocked enclosed contact power switching units and a microprocessor based controller to
automatically transfer system load to a generator supply in the event of a utility supply failure.
System load is then automatically re-transferred back to the utility supply following restoration of
the utility power source to within normal operating limits.

The standard TS 870 series Automatic Transfer Switch is rated for 100% system load and requires
upstream over current protection. The TS 870 Automatic Transfer Switch may be supplied with
optional integral over current protection within the enclosed contact power switching units for
applications such as Service Entrance Rated equipment. Refer to Section 6 of this manual for
detailed information on over current protection.

The TS 870 series transfer switches use a type TSC 80E microprocessor based controller, which
provides all necessary control functions for fully automatic operation. The TSC 80E controller is
mounted on the door of the transfer switch enclosure and operating status is shown via LED lights.
For further information on the TSC 80E Transfer Controller, refer to separate instruction manual
PM063.

The power switching devices used for the Utility and Generator sources are operated by an
electrically driven motor mechanism in the transfer switch. The transfer switch motor utilizes the
power from the source to which the electrical load is being transferred. The mechanism provides a
positive mechanical interlock to prevent both power switching units from being closed at the same
time, which allows an open transition, “break-before-make” transfer sequence. The TSC 80E

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transfer controller provides a standard neutral position delay timer to allow adequate voltage decay
during transfer operation to prevent out of phase transfers.
Note: For the purpose of this manual, the following standard nomenclature is utilized:

• Utility: to indicate the source of primary power

• Generator: to indicate the source of standby power

• Power switching device: to indicate the transfer switch power switching device

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1

N - MOLDED CASE SWITCH C/W ELECTRONIC

2

2

1

1

N - MOLDED CASE SWITCH C/W ELECTRONIC

5

17. ENCLOSURE TYPE

1

2

3

3

4

5

4

4.1. PRODUCT MODEL CODE

The type of TS 870 series transfer switch supplied is identified by way of a 21 digit product
code which appears on the equipment rating plate (MODEL) on the door of the transfer
switch, and on the transfer switch drawings. The model code structure and definitions are
as follows:

1-3. SERIES 15 . VOLTAGE 18. UTILITY SWITCHING DEVICE

TS - TRANSFER SWITCH

4 & 5. MODEL

87 - 870 SWITCH

6. POLES

2 - 2 POLE
3 - 3 POLE
4 - 4 POLE J - 240/416

7. CONFIGURATION TYPE

A - ATS
X - SPECIAL

8 - 11. AMPERAGE

0100 P - 208 & GF TRIP (250-1200A)
0150 Q - 220
0200
0250 U - 416 A - STANDARD
0400 V - 480 X - SPECIAL
0600 W - 600
0800 X - SPECIAL
1000 A - STANDARD
1200

12. APPLICATION

A - STANDARD
B - SERVICE ENTRANCE
X - SPECIAL A - NEMA1, ASA #61 GREY

13. OPERATION TYPE

1 - OPEN TRANSITION D - NEMA3R SD, ASA #61 GREY
2 - MANUAL ELEC. OP. E - NEMA3R DD, ASA #61 GREY
X - SPECIAL F - NEMA3RX/4X DD AT 800A AND ABOVE AND N4 AT 600A

14 . SAFETY STANDARDS

A - UL 1008 H - NEMA 3RXDD (ALUMINUM)
B - CSA C22.2 NO 178
X - NOT APPLICABLE X - SPECIAL

1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

T S 8 7

1f 3 WIRE

D - 120/240 M - MOLDED CASE SWITCH C/W THER-MAG

3f 4 WIRE (GROUNDED NEUTRAL)

E - 120/208
F - 127/220 TRIP (250-1200A)

G - 120240 1 (DELTA)
H - 220/380
S - 230/400

K - 254/440 K - MOLDED CASE SWITCH (100 - 1200 A)
M - 277/480
N - 347/600
Y - MULTIVOLTAGE

Customer to specify voltage when ordering

3f 3 WIRE

R - 240

16. CONTROLLER

3 - TSC 80e C - ALTERNATE C (1000-1200A)
7 - NONE (MANUAL) D - ALTERNATE D (1000-1200A)

B - NEMA2, ASA #61 GREY
C - NEMA12, ASA #61 GREY

(306 STAINLESS STEEL)

G - NONE (OPEN STYLE)

ASA #61 GREY

(STOCK SWITCHES ONLY)

1

K - MOLDED CASE SWITCH (100 - 1200 A)

TRIP (100-200A)

P - MOLDED CASE SWITCH C/W ELECTRONIC

& GF TRIP (250-1200A)

19. GENERATOR SWITCHING DEVICE

M - MOLDED CASE SWITCH C/W THER-MAG

TRIP (100-200A)

TRIP (250-1200A)

P - MOLDED CASE SWITCH C/W ELECTRONIC

20. POWER CONNECTIONS

21. ATS CONNECTION CONFIGURATION

B - ALTERNATE B (1000-1200A)

NOTES

MULTI-VOLTAGE CAPABLE
FOR 50 Hz APPLICATION
STANDARD ENCLOSURE RATING IS N3R

AND BELOW

ONLY AVAILABLE 800A AND ABOVE
240V MAX

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4.2. TYPICAL COMMISSIONING PROCEDURES

CAUTION:

Commissioning procedures must be performed by qualified
personnel only. Ensure the Automatic Transfer Switch
(ATS) Control Circuit Isolation Plug is disconnected prior to
energizing the supply sources. Manually place the transfer
switch mechanism in the neutral position prior to applying
power. Failure to do so may result in equipment failure or
personal injury.

Note: The TYPICAL AUTOMATIC TRANSFER SWITCH COMMISSIONING
PROCEDURES MODEL SERIES TS 870 (attached as “Appendix A ”) is provided for

general information only pertaining to typical site installations and applications. Contact
Thomson Technology for further information as may be required.

5. GENERAL THEORY OF OPERATION

5.1. STANDARD AUTOMATIC TRANSFER SWITCH

5.1.1. NORMAL OPERATION

When utility supply voltage drops below a preset nominal value (adjustable from
70% to 100% of nominal) on any phase, an engine start delay circuit is initiated and
the transfer to utility supply signal will be removed (i.e. contact opening). Following
expiry of the engine start delay period (adjustable from 0 to 60 sec.) an engine start
signal (contact closure) will be given.

Once the engine starts, the transfer switch controller will monitor the generator
voltage and frequency levels. Once the generator voltage and frequency rises
above preset values (adjustable from 70% to 95% of nominal), the engine warm-up
timer will be initiated. Once the warm-up timer expires (adjustable from 0 to 60
sec.), the Transfer to Generator Supply signal (contact closure) will be given to the
transfer switch mechanism. The load will then transfer from the utility supply to the
generator supply via the motor driven mechanism.

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The generator will continue to supply the load until the utility supply has returned.
The retransfer sequence is completed as follows: when the utility supply voltage is
restored to above the preset values (adjustable from 70% to 95% of nominal) on all
phases, a transfer return delay circuit will be initiated. Following expiry of the Utility
Return Timer (adjustable from 0 to 30 min.), the Transfer to Generator Supply signal
will be removed (contact opening), then the Transfer to Utility Supply signal (contact
closure) will be given to the transfer switch mechanism. The load will then retransfer
the load from the generator supply back to the utility supply. Note: A neutral delay
timer circuit will delay the transfer sequence in the neutral position (i.e. both power
switching devices open) until the neutral delay time period expires (adjustable from 0
to 60 seconds).

An engine cooldown timer circuit will be initiated once the load is transferred from
the generator supply. Following expiry of the cooldown delay period (adjustable
from 0 to 30 minutes), the engine start signal will be removed (contact opening) to
initiate stopping of the generator set.

5.2. SERVICE ENTRANCE AUTOMATIC TRANSFER SWITCH

Note: This applies only to service entrance transfer switches

5.2.1. NORMAL OPERATION

Under normal conditions, the load is energized from the utility supply through the
closed utility transfer power switching device. If the utility power fails, the generator
will start and the load will be re-energized via the closed generator transfer power
switching device.
In the normal operating mode, the Service Disconnect switch shall be in the
“energized” position.

5.2.2. OVER CURRENT TRIP

Should the utility power switching device trip open due to an over current condition,
TSC 80E transfer controller will initiate an engine start signal and will permit transfer
of the load to the generator supply. The utility source will be locked out and the load
will remain on the generator supply until the TSC 80E alarm signal is manually reset.
Refer to the TSC 80E Instruction Manual for further details on Transfer Fail
operation.

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Should the generator power switching device trip open due to an over current
condition, TSC 80E transfer controller will initiate transfer of the load to the utility
supply. The generator source will be locked out and the load will remain on the utility
supply until the TSC 80E alarm signal is manually reset.

5.2.3. SERVICE DISCONNECT PROCEDURE

To perform a service disconnect (i.e. to disconnect the utility and generator
supplies), the following procedure is required:

1. Move the "Service Disconnect" control switch located on the door of the
transfer switch to the "Disconnected" position.

2. Verify that the "Service Disconnected" pilot light is illuminated. If the Light

is illuminated, the service has been successfully disconnected and it is safe
to perform any maintenance procedures as required. In this condition, the

transfer switch is in the neutral position, with both utility and generator
transfer power switching devices open. The transfer switch will remain in this
condition, regardless of condition of the utility and generator supplies (i.e. if
the utility power fails, the generator will not receive a start signal, nor will the
transfer switch move to the generator position). NOTE: If the Service

Disconnect Light is not illuminated, additional procedures are required (refer
to the following procedure #5.2.4).

3. Attach safety lockout padlock to the "Service Disconnect" control switch to
prevent unauthorized change in operating condition and verify transfer switch
door is locked closed. If the door is not locked, turn and remove door key.

WARNING!

Close and lock the transfer switch enclosure door
before connecting power sources.

4. To reenergize the load, remove the padlock(s) from the service disconnect
control switch, and move the switch to the energized position. The transfer
switch will immediately return to the utility or generator supply if within normal
operating limits.

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5.2.4. ADDITIONAL PROCEDURES

If the "Service Disconnected" pilot light is not illuminated, the service will not
have been successfully disconnected and therefore it is not safe to perform
any maintenance until the following additional procedures are performed:

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

1. Open the door to the transfer switch using a suitable tool and opening the
door lock with the key.

2. Visually inspect the actual position of the transfer switch mechanism. If

the position of the transfer switch mechanism is clearly in the "neutral
position" and the load bus is de-energized on all phases, the service has
been successfully disconnected. Proceed to Step. 4.

If the position of the transfer switch mechanism is not in the neutral position
or the load bus is energized, further procedures are required.
Note: If the position of the transfer switch mechanism is clearly in the
"neutral position, the "service disconnected" pilot light may not have
illuminated due to the following reasons:

a) Utility and generator supply voltages are not present (the pilot light
requires AC supply voltage to be present).
b) The pilot light may be burnt out. The bulb should be immediately
replaced with a suitably rated bulb.
c) Failure of one or more of the sensing/logic contacts. A qualified
service technician is required to trouble shoot this specific condition.
Switch the utility control circuit isolation switch to the de-energized
position to remove utility control power. To isolate the generator supply,
remove the control circuit isolation plug. Note: The AC power

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conductors will still remain energized. Once all the control circuits are de­energized and isolated the "Service Disconnected" pilot light will not
illuminate due to loss of control power.
Note: To return the transfer switch back to normal operation, the utility
control circuit disconnect switch and control circuit isolation plug must be
switched on and reconnected for correct operation.

3. If the position of the transfer switch mechanism is not in the "neutral
position", manually operate the transfer switch mechanism depending on
mechanism type as follows:
Note: Refer to product drawings in sections 12, 13 & 14 for identification of
Transfer Switch Mechanism style supplied with the Transfer Switch.

a. T-Style Mechanism: Pull the manual release plunger on

the mechanism, releasing the motor drive rod from motor
drive arm and move the knob and yoke to the marked
“neutral position”.

b. S-Style Mechanism: Insert the operating handle into the

front of the transfer mechanism and turn the operating
handle until the position indication on the mechanism
clearly shows the “neutral position”.

WARNING!
Failure to move the mechanism to the Neutral
Position may result in serious personal injury
or death due to electrical shock.

4. Close the transfer switch door securely using a suitable tool. Lock the
door in the closed position and remove the key.

WARNING!
Failure to positively lock closed and secure the
transfer switch door may result in serious
personal injury or death due to electrical
shock.

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5. Attach a safety lockout padlock to the service disconnect control switch to
prevent unauthorized change in operating condition and verify transfer switch
door is locked closed.

6. To reenergize the load, remove the padlock(s) from the service
disconnect control switch, and move the switch to the Energized position.
The transfer switch will immediately return to the utility or generator supply if
within normal operating limits.

5.3. TEST MODES

The transfer switch may be tested utilizing the TSC 80E controller push-buttons or optional
four position test switch. A simulated utility power failure condition will be activated when
the test mode is selected. The transfer switch will operate as per a normal utility power fail
condition.
The transfer switch will remain on generator supply until the test mode is terminated. It will
then immediately transfer back to the utility supply and then continue to operate the
generator set for its cooldown period then stop. Note: The transfer switch will automatically
return to the utility supply (if within nominal limits) if the generator set fails while in the test
mode.

6. OVER CURRENT PROTECTION

Thomson Technology TS 870 series of Automatic Transfer Switches may be supplied with or
without integral over current protection as described below:

6.1. STANDARD TS 870 AUTOMATIC TRANSFER SWITCH

The standard TS 870 Automatic Transfer Switch does not contain any integral over current
protection and requires upstream over current protection devices for both Utility and
Generator sources. The Standard TS 870 is rated for 100% continuous loading and can
withstand a maximum short circuit fault current as noted in Section 15 of this manual. The
standard TS 870 transfer switch model without integral over current protection is identified
in the product model code. Refer to Section 4.1 of this manual for further details on model
coding.

6.2. OPTIONAL TS 870 AUTOMATIC TRANSFER SWITCH WITH INTEGRAL
OVER CURRENT PROTECTION

TS 870 transfer switches will have integral over current protection supplied on the Utility
source as standard. The type of over current protection utilized is dependent upon ATS
amperage size and optional features specified. For transfer switches rated 100A through

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200A, over current protection is non-adjustable thermal-magnetic type trip units. For
transfer switches rated 400A through 1200A over current protection is adjustable electronic
type with long time & instantaneous trip unit elements with optional ground fault protection
elements.
Note: Ground fault protection is supplied as standard on 1000A and 1200A transfer
switches that are used on systems greater than 240V.
An upstream over current protection device is required on the generator source which feeds
the TS 870 Transfer Switch if integral over current protection option is not specified on the
ATS.
Note: For models of transfer switch with adjustable integral over current protection trip units,
the over current protection must be set prior to operation. The equipment will be shipped
from the factory with a long-time current setting of 100% (of the equipment rating) and
maximum instantaneous/short-time current and time delay settings.

WARNING!
Do Not Energize this equipment until
device settings have been verified to
ensure proper system protection &
coordination. Failure to do so may result
in equipment failure.

Refer to Section 4.1 Product Model Code for types of integral over current protection which
are supplied with the transfer switch.

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TS 870 TRANSFER SWITCH

7. GENERAL NOTES ON SERVICING TRANSFER SWITCH MECHANISM

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

Note: Refer to product drawings in sections 12, 13 & 14 for identification of Transfer Switch
Mechanism style supplied with the Transfer Switch.

When performing any service work on the transfer mechanism, it is imperative that the following be
observed:

7.1. To maintain mechanical integrity, ensure that:

• On T Style mechanisms, all limit switches are correctly adjusted to provide full
travel of the power switching device toggles without exerting unnecessary forces
associated with excessive travel. Ensure that power switching device travel far
enough to reset any internal trip unit (it is more important for the toggle to go fully
in the "off" direction, than in the "on" direction).

• Mechanical interlocking is correct when one power switching opens well before
the other should close.

• All fasteners are adequately tightened.

• The operating linkages are not damaged or bent, and that all bearing points

operate freely.

• On S style transfer switch mechanisms, check nylock nuts on bolt pivot points.
Operation arms should move freely without excessive play.

7.2. To maintain electrical integrity, ensure that:

• All electrical connections, especially power connections, are clean and
adequately tightened. Corroded or loose power connections will cause
destructive heating, and may cause premature tripping.

• All insulating devices are in place and in good condition.

• No moisture or other contamination is present.

PM062 REV 8 10/01/25 18 Thomson Technology

TS 870 TRANSFER SWITCH

• Electrical conductors are adequately secured away from moving parts.

7.3. To maintain operational integrity, ensure that:

• All control devices are in good condition and correctly calibrated.

• All control devices are adequately secured in their plug-in fixtures.

Only qualified personnel should undertake Service work. Failure to correctly maintain an
automatic transfer switch may present a hazard to life and equipment. Full operational
testing must be done prior to placing a transfer switch in service subsequent to any
maintenance or repair. Any service work involving electrical components requires high­potential testing to ensure that required insulation levels have been maintained.

PM062 REV 8 10/01/25 19 Thomson Technology

TS 870 TRANSFER SWITCH

8. TRANSFER SWITCH MECHANISM – 100A-800A, S Style

The transfer mechanism consists primarily of the transfer gear motor, a drive hub assembly, and
two power switching device operating arms.
The reversible transfer gear motor drives the drive hub assembly, which in turn moves the power
switching device operating arms. The power switching device toggles are set inside the operating
arm slots and are moved by them. There are two limit switches, which are contacted by the
operating arms (one for each power switching device), which disconnect the transfer motor power
supply when the power switching devices have attained full travel. Should limit switch adjustment
be required, it is advisable to consult Thomson Technology for further information.
The transfer switch mechanism has three possible positions:
a) Utility power switching device closed and generator power switching device open;
b) Generator power switching device closed and utility power switching device open;

c) Both utility and generator power switching devices open, but NEVER both utility and

generator power switching devices closed at the same time.

8.1. MANUAL OPERATION

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

Isolate the transfer switch from all sources of supply before opening the enclosure for
manual operation. With all sources of power de-energized to the transfer switch, the control
circuit isolation plug can be unplugged to prevent subsequent operation. The control circuit
isolation plug is located on the inner side of the transfer switch enclosure door.
To operate manually, insert the operating handle into the square hole on the front of the
mechanism and rotate to the desired position. Remove the operating handle once operation
is complete and re-insert into the handle holder on the left-hand side of the transfer switch
mechanism.

PM062 REV 8 10/01/25 20 Thomson Technology

TS 870 TRANSFER SWITCH

Automatic operation may be regained by replacing the control circuit isolation plug. With all
sources of power de-energized to the transfer switch, the control circuit isolation plug can
be re-connected. The drive system will operate the transfer switch to the required position.
(See manual operation instruction on front of transfer switch mechanism.)

PM062 REV 8 10/01/25 21 Thomson Technology

TS 870 TRANSFER SWITCH

9. TRANSFER SWITCH MECHANISM –1000A-1200A, T-Style

The transfer mechanism consists primarily of the transfer motor, a hub assembly, two operating
rods and two power switching device operating yokes.

The reversible transfer motor drives the hub assembly, which in turn moves the operating rods that
are connected to the power switching device operating yokes. The power switching device toggles
are set inside the yokes and are moved by them. There are two limit switches, which are contacted
by the operating yokes (one for each direction of travel), which disconnect the transfer motor power
supply when the power switching devices have attained full travel. The adjuster screws, located on
the yokes determine the operating point of these limit switches. Should adjustment be required, it
is advisable to consult Thomson Technology for further information.
The transfer switch mechanism has three possible positions:
a) Utility power switching device closed and generator power switching device open;
b) Generator power switching device closed and utility power switching device open;

d) Both utility and generator power switching devices open, but NEVER both utility and

generator power switching devices closed at the same time.

9.1. MANUAL OPERATION

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

Isolate the transfer switch from all sources of supply before opening the enclosure for
manual operation. With all sources of power de-energized to the transfer switch, the control
circuit isolation plug can be unplugged to prevent subsequent operation.
To operate manually, pull the release plunger and operate the handle in the desired
direction.
Automatic operation may be regained by replacing the isolation plug. With all sources of
power de-energized to the transfer switch, the control circuit isolation plug can be re-

PM062 REV 8 10/01/25 22 Thomson Technology

TS 870 TRANSFER SWITCH

connected. The drive system is self-engaging and will operate the transfer switch to the
required position. (See manual operation instruction on front of transfer switch mechanism.)

PM062 REV 8 10/01/25 23 Thomson Technology

TS 870 TRANSFER SWITCH

10. RECOMMENDED MAINTENANCE

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

10.1. DO NOT perform dielectric tests on the equipment with the control components in
the circuit.

10.2. Check if control components are tight in sockets.

10.3. Periodically inspect all terminals (load, line and control) for tightness. Re -torque all

bolts, nuts and other hardware. Clean or replace any contact surfaces, which are
dirty, corroded or pitted.

10.4. Transfer switches should be in a clean, dry and moderately warm location. If signs

of moisture are present, dry and clean transfer switch. If there is corrosion, try to
clean it off. If cleaning is unsuitable, replace the corroded parts. Should dust and/or
debris gather on the transfer switch, brush, vacuum, or wipe clean. DO NOT blow
dirt into power switching devices.

10.5. Test the transfer switch operation. While the unit is exercising, check for freedom of

movement, hidden dirt, corrosion or any excessive wear on the mechanical
operating parts. Ensure that the power switching device travel is correct.

10.6. Verify all program settings on the TSC 80E controller as per the TSC 80E

component calibration label on the rear cover of the controller.

10.7. Transfer Mechanism 1000A-1200A-T Style ensure that the manual handle moves

freely on the hub when the lock pin is disengaged. If lubrication is necessary, apply
medium weight (SAE 20) oil sparingly.

10.8. Transfer Mechanism 1000A-1200A T Style -yoke pivot bearings and rod ends are

permanently lubricated and do not require maintenance.

10.9. Transfer Mechanism 100A-800A S Style –lubrication of drive hub/operator arm

interface. Use high viscosity moly lubricant.

PM062 REV 8 10/01/25 24 Thomson Technology

TS 870 TRANSFER SWITCH

10.10. The motor and gearbox on all Transfer Mechanism styles are permanently

lubricated, and should not require attention under normal operating circumstances.

PM062 REV 8 10/01/25 25 Thomson Technology

TS 870 TRANSFER SWITCH

11. FRONT VIEW (TYPICAL) 3 / 4 POLE 100A-250A S-Style TRANSFER
MECHANISM

PM062 REV 8 10/01/25 26 Thomson Technology

TS 870 TRANSFER SWITCH

12. FRONT VIEW (TYPICAL) 3 POLE 400A-800A S-Style TRANSFER
MECHANISM (Mechanism Front Cover Removed)

ØC ØB ØA N ØCØBØAN

PM062 REV 8 10/01/25 27 Thomson Technology

ØCØBØAN

CUSTOMER

WORK ORDER No.ORDER No.

DWN BY AUTH BY DATE REV

DRAWING/FILE No.

SHEET

TS 870 TRANSFER SWITCH

13. FRONT VIEW (TYPICAL) 3 / 4 POLE 1000A-1200A T-Style TRANSFER
MECHANISM

PM062 REV 8 10/01/25 28 Thomson Technology

TS 870 TRANSFER SWITCH

14. CONNECTION CONFIGURATION OPTIONS

PM062 REV 8 10/01/25 29 Thomson Technology

TS 870 TRANSFER SWITCH

15. CABLE TERMINAL INFORMATION

TERMINAL RATING

BASIC MODEL

QTY

PER PHASE

TS 87xA-0100

1 #14-1/0

RANGE

CONNECTION TIGHTNESS

(In-lbs)

TERMINAL

MOUNTING

SCREW

CABLE
CLAMP

120 50

TS 87xA-0150

1 #2–4/0

120 120

TS 87xA-0200 1 #6–350MCM 150 275
TS 87xA-0250 1 #6–350MCM 150 275
TS 87xA-04001 2 2/0–500MCM 72 275
TS 87xA-06001 2 2/0–500MCM 72 275
TS 87xA-08001 3 2/0–500MCM 110 375
TS 87xA-12001 4 4/0–500MCM 375 375

1. Optional terminal ratings are available in some models – Consult Thomson Technology.

2. For other model types not shown, contact Thomson Technology for further information.

16. REQUIREMENTS FOR UPSTREAM CIRCUIT PROTECTIVE DEVICES

16.1. WITHSTAND CURRENT RATINGS (ALL MODELS WITHOUT INTEGRAL

OVERCURRENT PROTECTION OPTION)

WITHSTAND CURRENT RATING AMPS (RMS) 1

TS87xA-0100

MAX.

VOLTAGE

600 100 65,000 25,000 18,000 100,000 T, J

RATED

CURRENT

(A)

With Upstream Circuit Breaker Protection With Upstream Fuse Protection BASIC MODEL

@240V @480V @600V @ Up to 600V Fuse Type

TS87xA-0150

TS87xA-0200

TS87xA-0250

TS87xA-0400

TS87xA-0600

TS87xA-0800

TS87A-1000/1200

1.

2.

Standard ratings only are shown. Consult Thomson Technology for versions with higher withstand current ratings.
For other model types not shown, contact Thomson Technology for further information.

600 150 65,000 25,000 18,000 100,000 T, J

240 200 65,000 N/A N/A N/A T, J

600 250 65,000 35,000 25,000 100,000 T, J

600 400 65,000 50,000 35,000 100,000 T, J

600 600 65,000 50,000 35,000 100,000 T, J

600 800 65,000 50,000 35,000 100,000 Consult Factory

600 1000/1200 65,000 50,000 42,000 100,000 Consult Factory

Fuse ratings shown are maximum allowable to permit use of the transfer switch in application with
available fault current not exceeding that shown. Consideration must be given to fuse sizing when
fuses also provide overload protection.

PM062 REV 8 10/01/25 30 Thomson Technology

TS 870 TRANSFER SWITCH

16.2. INTERRUPTING CAPACITY CURRENT RATINGS (ALL MODELS WITH

INTEGRAL OVERCURRENT PROTECTION OPTION)

INTERRUPTING CAPACITY CURRENT RATING AMPS (RMS) 1

TS87xA-0100

MAX.

VOLTAGE

600 100 65,000 25,000 14,000

RATED

CURRENT (A)

No Upstream Circuit Breaker Protection Required BASIC MODEL

@240V @480V @600V

TS87xA-0150

TS87xA-0200

TS87xA-0250

TS87xA-0400

TS87xA-0600

TS87xA-0800

TS88xA-1000/1200

600 150 65,000 25,000 14,000

240 200 65,000 N/A N/A

600 250 65,000 35,000 22,000

600 400 65,000 50,000 25,000

600 600 65,000 50,000 25,000

600 800 65,000 50,000 25,000

600 1000/1200 65,000 50,000 50,000

1. Standard ratings only are shown. Consult Thomson Technology for versions with higher interrupting capacity current ratings.

2. For other model types not shown, contact Thomson Technology for further information.

17. GROUND FAULT SITE TEST REQUIREMENTS

Per NEC and UL1008, a ground fault protected system shall be performance tested when first
installed on site. A written record of this shall be made and be available to the authority having
jurisdiction. A form is provided at the back of this manual for this purpose – see Section 21.

Confirm and record actual trip setpoints in the form provided which is to be made available on
request by inspection authority.

17.1. PERFORMANCE TEST

Qualified Field Service technicians require a calibrated current injection test apparatus and
must be knowledgeable in breaker testing to provide primary neutral CT injection up to or
greater than the trip setpoint as selected by the responsible party. As indicated in the NEC,
the maximum setting of the ground fault protection shall be 1200 amps, and the maximum
time delay shall be 1 second for ground faults equal to or greater than 3000 amps.
The inspection authority should be contacted to confirm actual test requirements as these
may vary by region or local code requirements.

PM062 REV 8 10/01/25 31 Thomson Technology

TS 870 TRANSFER SWITCH

The interconnected system shall be evaluated to ensure compliance with the appropriate
schematic drawings. The proper location of sensors and power cabling shall be
determined. The grounding points of the system shall be verified to determine that ground
paths do not exist that would bypass the sensors. The use of high-voltage testers and
resistance bridges may be required. A simulated fault current is to be generated by a coil
around the sensors. The reaction of the circuit-interrupting device is to be observed for
correct response. The results of the test are to be recorded on the test form provided.

PM062 REV 8 10/01/25 32 Thomson Technology

TS 870 TRANSFER SWITCH

18. TROUBLESHOOTING

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death

Symptom Possible Causes

Will not re-transfer to utility source
upon restoration

Will not transfer to generator source
upon failure of utility source

- Isolation plug out

- Utility disconnect switch is in the de-energized position
(Service Entrance Rated ATS). Switch to the Energized
position.

- A test mode has been activated (check TSC 80E status LED)

- Utility voltage is below the pre-programmed limits (check utility
source for adequate voltage)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- TSC 80E has incorrect voltage setting as set via software
programming

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by
flashing Load on Utility LED. Determine cause of alarm and
rectify before TSC 80E is reset

- Isolation plug out

- Generator set not producing enough voltage/frequency or
output circuit breaker open

- TSC 80E has incorrect voltage setting as set via software
programming

- Warm-up time delay function has not timed out yet (verify
TSC 80E timer setting)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by
flashing Load on Generator LED. Determine cause of alarm
and rectify before TSC 80E is reset

PM062 REV 8 10/01/25 33 Thomson Technology

TS 870 TRANSFER SWITCH

Symptom Possible Causes

Will not re-transfer to utility source
upon restoration

Will not transfer to generator source
upon failure of utility source

Transfer to generator source without a
power failure in the utility source

Generator does not start up or stop
when it should

No time delay when there should be

- Isolation plug out

- Utility disconnect switch is in the de-energized position
(Service Entrance Rated ATS). Switch to the Energized
position.

- A test mode has been activated (check TSC 80E status LED)

- Utility voltage is below the pre-programmed limits (check utility
source for adequate voltage)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- TSC 80E has incorrect voltage setting as set via software
programming

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by
flashing Load on Utility LED. Determine cause of alarm and
rectify before TSC 80E is reset

- Isolation plug out

- Generator set not producing enough voltage/frequency or
output circuit breaker open

- TSC 80E has incorrect voltage setting as set via software
programming

- Warm-up time delay function has not timed out yet (verify
TSC 80E timer setting)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by
flashing Load on Generator LED. Determine cause of alarm
and rectify before TSC 80E is reset

-

A test mode has been activated (check TSC 80E status LED)

-

Utility supply voltage is slightly below voltage sensing
setpoints.

Verify TSC 80 has correct voltage configuration jumper setting

for system voltage or TSC 80E has incorrect voltage setting as
set via software programming

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- Utility power switching device has tripped due to an over
current condition and TSC 80E “Transfer Fail” alarm activated
as indicated by flashing Load on Utility LED. Determine cause
of alarm and rectify before TSC 80E is reset.

- Verify remote engine control panel is set for automatic mode

- Verify time delay setting of the TSC 80E controller

PM062 REV 8 10/01/25 34 Thomson Technology

TS 870 TRANSFER SWITCH

Symptom Possible Causes

Will not re-transfer to utility source
upon restoration

Will not transfer to generator source
upon failure of utility source

- Isolation plug out

- Utility disconnect switch is in the de-energized position
(Service Entrance Rated ATS). Switch to the Energized
position.

- A test mode has been activated (check TSC 80E status LED)

- Utility voltage is below the pre-programmed limits (check utility
source for adequate voltage)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- TSC 80E has incorrect voltage setting as set via software
programming

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by
flashing Load on Utility LED. Determine cause of alarm and
rectify before TSC 80E is reset

- Isolation plug out

- Generator set not producing enough voltage/frequency or
output circuit breaker open

- TSC 80E has incorrect voltage setting as set via software
programming

- Warm-up time delay function has not timed out yet (verify
TSC 80E timer setting)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- Defective TSC 80E controller (verify output signals with circuit
board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by
flashing Load on Generator LED. Determine cause of alarm
and rectify before TSC 80E is reset

Power is not available at the load
terminals but the utility or generator
power switching device appears to be
closed to a live source

- Limit switch incorrectly adjusted
The transfer switch has completed a

transfer, but the motor has overheated and
the internal thermal protector has opened

PM062 REV 8 10/01/25 35 Thomson Technology

- The power switching device's over current protection unit has
opened due to a fault on the system. Correct the fault, and
manually reset the power switching device in the transfer
switch by moving it off and then on again with the manual
operating handle

-

Limit switch failure or improper adjustment has failed to
disconnect motor

-

Binding or jamming of the transfer mechanism

TS 870 TRANSFER SWITCH

NOTE
There are no user serviceable components located on the
TSC 80E printed circuit board. If the TSC 80E controller is
deemed to be defective it must be returned to the Thomson
Technology Factory for repair or replacement. Please refer to
Product Return Policy section of this manual further
information on product return procedures required.

19. REPLACEMENT PARTS

Replacement parts are available for the transfer switch as follows:

NOTE

When ordering replacement parts please provide the
following information:

-Transfer Switch Model code (e.g. TS 873AA0200AS)

-Transfer Switch Serial Number (e.g. W-022345)
The above information can be found on the transfer
switch equipment rating plate located on the outside of
the ATS door.

Component Description

TSC 80E Service Replacement
Controller Board c/w lexan

TSC 80E Lexan Faceplate 008315 Contact Thomson Technology

TSC 80E Rear Cover 005707

Thomson Technology
Part Number

TSC80ESR Must program setpoints via

Comments

software prior to use. Refer to TSC
80E Instruction Manual.

Service Dept for installation
procedures.

Limit Switch 1 n/o, 1 n/c (all
ATS Models)

PM062 REV 8 10/01/25 36 Thomson Technology

004929 Must install and adjust for proper

operation before use. Contact
Thomson Technology Service Dept
for installation/adjustment
procedures

Component Description

TS 870 TRANSFER SWITCH

Thomson Technology
Part Number

Comments

Transfer Switch Motor
(100A-250A S Style
Mechanism) 120V 20 watt 1
PH

Transfer Switch Motor
(400A-800A S Style
Mechanism) 120V 30 watt 1
PH

Transfer Switch Motor
(1200A T-Style Mechanism)
120V 1/10 hp 1 PH

120VAC Auxiliary Plug-in
Relay, 11 pin Square (UX/GX)

120VAC Auxiliary Plug-in Timer 001515 Must ensure coil voltage is correct
100VA Control Transformer 002159

007701 Motor is supplied with gear box

assembly. Contact Thomson
Technology Service Department
for installation procedures

007961 Motor is supplied with gear box

assembly. Contact Thomson
Technology Service Department
for installation procedures

001075 Motor is supplied with gear box

assembly. Contact Thomson
Technology Service Department
for installation procedures

001278 Must ensure coil voltage is correct

For other parts not listed, please contact Thomson Technology.

20. PRODUCT RETURN POLICY

Thomson Technology uses a Return Material Authorization (RMA) process. Please complete the

Return Authorization Request Form (available on our web page) for return of goods, warranty

replacement/repair of defective parts, or credit consideration and fax to the appropriate
department.

Returns only: Sales Fax [phone]
Warranty replacement/Warranty Repair: Service Fax [phone].

Upon receipt of your request, Thomson Technology will confirm with a copy of our Order
Acknowledgement via fax advising the RMA number which should be used to tag the defective
controller prior to shipment.

PM062 REV 8 10/01/25 37 Thomson Technology

21. NOTES

TS 870 TRANSFER SWITCH

PM062 REV 8 10/01/25 38 Thomson Technology

TS 870 TRANSFER SWITCH

22. PERFORMANCE TEST FORM

This form should be retained by those in charge of the building electrical installation in order to be
available to the authority having jurisdiction.

Date Personnel Tests performed Comments

Interconnection evaluation
Grounding point evaluation
Fault current test:
Ground fault settings -

______________________________

Simulated current -

______________________________

Results -

______________________________

PM062 REV 8 10/01/25 39 Thomson Technology

APPENDIX “A”

THOMSON TECHNOLOGY

TYPICAL AUTOMATIC TRANSFER SWITCH

COMMISSIONING PROCEDURES

Model Series TS 870

Note: The following commissioning procedures are provided for general information only

pertaining to typical site installations and applications. Contact the equipment supplier
for further information as may be required.

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical personnel
utilizing safe work practices and appropriate Personal Protective Equipment (PPE).
Failure to do so may cause personal injury or death

CAUTION

Commissioning procedures must be performed by qualified personnel only. Ensure the
Automatic Transfer Switch (ATS) Control Isolation Plug is disconnected prior to energizing the
supply sources. Manually place the transfer switch mechanism in the neutral position by
opening both Utility and Generator Power Switching devices prior to applying power.

©

Pre-Commissioning Checks Prior to Commissioning Agent On-Site (to allow
loads to be supplied prior to final commissioning)

1) Verify the system voltage of both sources (i.e. generator and utility) to be applied to the
transfer switch are of the correct nominal system value which matches the ATS drawings and
the ATS equipment label ratings. If the system voltage is correct, proceed to step 3. If system
voltage is incorrect for the rating of the ATS supplied, proceed to step 2.

CAUTION: FAILURE TO RE-CONFIGURE ATS VOLTAGE TO MATCH SYSTEM VOLTAGE
WILL RESULT IN EQUIPMENT MALFUNCTION AND DAMAGE.

NOTE: The factory default system voltage setting for multi-voltage TS 840/870 transfer

switches is 480VAC, which will be indicated by a letter “Y” in the voltage code as shown
on the ATS model code (e.g. TS 873A0250A1AY) and on a warning tag attached to the
isolation plug.

2) To re -configure the ATS for the correct system voltage prior to energization, refer to Appendix
B.

3) For 240V High Leg Delta systems refer to the ATS instruction manual for correct phasing
required and re-configuring procedures.

CAUTION: FAILURE TO OBTAIN THE CORRECT ATS PHASING WILL RESULT IN
EQUIPMENT MALFUNCTION AND DAMAGE.

9087A - 198th Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]

APPENDIX “A”

THOMSON TECHNOLOGY

TYPICAL AUTOMATIC TRANSFER SWITCH

COMMISSIONING PROCEDURES

Model Series TS 870

4) Confirm cable size is correct for the lugs supplied in the transfer switch (line and load).
Confirm the cables were meggered by the electrical contractor to ensure no cross phase
connections or conduction to ground.

5) Confirm cable lugs are properly torqued. Confirm cable installation; ensure the cables do not
interfere with normal equipment operation or which may cause component damage.

6) Manually operate the transfer mechanism to the appropriate source of supply. Leave the

Isolation Plug disconnected until final Transfer Switch Commissioning is to be completed.

Final Commissioning

1) Verify installation of the Automatic Tra nsfer Switch as per installation manual and verify wiring
(also see the Pre-Commissioning Checks). Confirm phase, neutral and grounding conductors
are installed as per electrical code requirements. Note: Confirm neutral conductors of both
sources are correctly installed and are solidly grounded for 3 phase 4 wire configurations.

2) Check for mechanical damage (shipping or installer).

©

3) Verify correct control wire interconnects to the engine/generator set auto start/stop circuitry.
Ensure the engine controller automatic start circuit does not draw more than 5.0 amps
(resistive) across the TSC 80E Engine Start contact. The TSC 80E Engine Start contact is
voltage free and the only voltage measured should result from the engine controllers internal
control logic. Note: The ATS Engine Start contact CLOSES to start the engine and OPENS to
stop the engine.

4) Place the generator engine controller in the "OFF" position and open the generator local circuit
breaker.

5) Ensure the ATS isolation plug is disconnected prior to application of voltage of the supply
sources.

6) Energize the utility supply and the generator supply sources and verify these meet the correct
voltage, phasing and phase rotation for the ATS and system. Once these have been confirmed
to be correct, de-energize both sources before installing the isolation plug.

7) Once the isolation plug is connected, the ATS and system load may be energized with utility
power once the site electrical contractor and or owner (as required) give authorization to
proceed.

8) If Utility power is within nominal limits, the ATS should transfer to the utility source. To
determine correct operation, observe the following on the TSC 80E faceplate:

i) Utility Source green LED is “ON”
ii) Green LED above mimic bus for the Utility source is “ON”
iii) Green “Load” LED is “ON”

9) To verify all LED’s are operational, perform a “LAMP TEST” operation (lamp test is initiated by
pressing and holding the 2 push buttons on the TSC 80E faceplate simultaneously “ON” until
all the LED’s change state).

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APPENDIX “A”

THOMSON TECHNOLOGY

TYPICAL AUTOMATIC TRANSFER SWITCH

COMMISSIONING PROCEDURES

Model Series TS 870

10) Prior to operating the generator, ensure it is ready to be energized and the site electrical
contractor and/or owner (as required) give authorization to proceed. In preparation for
operation, turn the generator’s engine control switch to the “Automatic” start position.

11) To transfer the generator on load, perform a load test by pressing the Utility Power Fail
Simulate pushbutton “ON” and holding it for approximately 5 seconds until the LED light above
the push button changes state. The engine should start following the 3-second engine start
delay period and the transfer switch will begin transferring to the generator supply once the 2­second engine warm-up timer expires. Note: The engine warm-up timer will only begin timing
once the generator’s output rises above 85% nominal voltage and 90% nominal frequency.
Once the Utility power switching device opens, the transfer switch mechanism will pause in the
neutral position for the 3-second neutral delay period, then the mechanism will complete the
transfer and close the generator power switching device. To determine correct operation,
observe the following on the TSC 80E faceplate:

i) Generator Source green LED is “ON”
ii) Red LED above mimic bus for the generator source is “ON”
iii) Green “Load” LED is “ON”
iv) Utility Source green LED is “ON”
v) Utility Power Fail Simulate yellow LED is “ON”
vi) Green LED above mimic bus for the Utility source is “OFF”

©

12) To terminate the test, press the Utility Power Fail Simulate push button on the TSC 80E
faceplate again and hold until the LED above the pushbutton changes state. The transfer
switch will begin transferring to the utility supply following the 2-minute utility return delay
period. Note: the utility return delay timer will only begin timing if the utility voltage is above
85% nominal on all phases. Once the Generator power switching device opens, the transfer
switch mechanism will pause in the neutral position for the 3-second neutral delay period, then
the mechanism will complete the transfer and close the Utility power switching device to return
the load to the Utility source. Once the load has transferred onto the utility source, the engine
will continue to run for the 2-minute cool down time delay period and will then it will
automatically stop.

13) Perform a power outage test by opening the upstream utility feeder breaker. The TSC 80E
controller Utility supply LED lights will de-energize; the generator set will start after the 3­second engine start delay has expired. The generator should transfer on load as described in
item #12 above.

14) Return the transfer switch to utility power by re-closing the upstream utility breaker. The load
should re-transfer back to the utility supply and the engine should stop as described in item
#13 above.

15) Repeat tests #12 through 14 two (or more) times to ensure correct operation.

16) Automatic Plant Exercise Operation (OPTIONAL): If an automatic weekly plant exercise
feature is desired, press the GENERATOR EXERCISE Mode push button on the TSC 80E
faceplate. Hold the push button “ON” for approximately 5 seconds until the LED light changes
state. Once the mode is initiated, the engine will immediately start and the generator will
transfer on load as previously described. Note: The generator may or may not transfer on

9087A - 198th Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]

APPENDIX “A”

THOMSON TECHNOLOGY

TYPICAL AUTOMATIC TRANSFER SWITCH

COMMISSIONING PROCEDURES

Model Series TS 870

load, which is dependent on the TSC 80E configuration setting. The factory default setting is
for a “Load Transfer” plant exercise test. The engine will remain operating on load until the
plant exercise time delay period expires, then the load will re-transfer back to the utility supply
following the 2-minute utility return timer. On ATS using TSC 80 controller, the engine will be
automatically re-tested on load every week (i.e.7 days) at the same time of day that the first
test was initiated. On ATS using TSC 80E controller, the engine will be automatically re-tested
as programmed in software. Refer to the TSC 80E manual for further information.

17) On completion of commissioning ensure all controls are left in automatic.

18) If required, forward document or drawing updates to the equipment supplier if revisions are
required and provide the end user with a set of marked-ups to be retained on site.

19) Ensure copies of manuals for the equipment are on site.

20) Record and forward list of deficiencies to the appropriate parties where applicable.

©

9087A - 198th Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]

APPENDIX “B”

THOMSON TECHNOLOGY

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical personnel

utilizing safe work practices and appropriate Personal Protective Equipment (PPE).

Failure to do so may cause personal injury or death

A) TSC 80E CONTROLLERS ONLY

INSTRUCTIONS TO CHANGE SYSTEM

VOLTAGE ON TS 870 SERIES TRANSFER

SWITCHES WITH /TSC 80E CONTROLLER

DANGER!!!!

©

1. Ensure all power sources are de-energized prior to opening the transfer switch enclosure door.

2. Disconnect “Control Circuit Isolation Plug”

3. Change voltage transformer primary taps settings to match new system voltage on all potential

transformers. (Refer to wiring schematic diagram below. Ensure all electrical connections are
tight.

9087A - 198

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APPENDIX “B”

THOMSON TECHNOLOGY

4. To change system voltage on a TSC 80E controller, the transfer switch must be

energized to provide control power to the controller to allow software programming. To
change the software setting, follow the procedure below

The TSC 80E controller does not utilize the system voltage jumpers,
which are located on the printed circuit board. Any jumpers on the
printed circuit board will be ignored.

5. Re-connect “Control Circuit Isolation Plug”

6. Energize Transfer Switch and follow the programming procedure shown below

INSTRUCTIONS TO CHANGE SYSTEM

VOLTAGE ON TS 870 SERIES TRANSFER

SWITCHES WITH /TSC 80E CONTROLLER

NOTE:

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9087A - 198

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APPENDIX “B”

THOMSON TECHNOLOGY

INSTRUCTIONS TO CHANGE SYSTEM

VOLTAGE ON TS 870 SERIES TRANSFER

SWITCHES WITH /TSC 80E CONTROLLER

©

9087A - 198

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Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]

APPENDIX “B”

THOMSON TECHNOLOGY

INSTRUCTIONS TO CHANGE SYSTEM

VOLTAGE ON TS 870 SERIES TRANSFER

SWITCHES WITH /TSC 80E CONTROLLER

©

9087A - 198

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Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]

APPENDIX “C”

THOMSON TECHNOLOGY

©

SEISMIC CERTIFICATE

9087A - 198

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Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]

APPENDIX “C”

THOMSON TECHNOLOGY

©

SEISMIC CERTIFICATE

9087A - 198

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Street, Langley, B.C. Canada V1M 3B1 • Telephone [phone] • Telefax [phone]