THOMSON TS 870 - User Manual

Other manuals for THOMSON TS 870

Service Manual47 pages

Questions and Answers

A
Amanda HarrisAug 28, 2025
Why does THOMSON TS 870 Switch transfer to generator source without a power failure?
- G
  gabriel21Aug 28, 2025
  If the Thomson Switch transfers to the generator source even without a utility power failure, it could be due to a few reasons: * A test mode might be activated, so check the TSC 80/TSC 80E status LED. * The utility supply voltage might be slightly below the voltage sensing setpoints. In this case, verify that the TSC 80 has the correct voltage configuration jumper setting for the system voltage, or that the TSC 80E has the correct voltage setting via software programming. * The utility power switching device may have tripped due to an overcurrent condition. Determine the cause of the alarm and rectify it before resetting the TSC 80/TSC 80E.
S
shelbyyoungSep 1, 2025
What to do if Thomson Switch will not transfer to generator source upon failure of utility source?
- C
  Christina MillerSep 1, 2025
  If the Thomson Switch fails to transfer to the generator source when the utility source fails, it could be due to the generator set not producing enough voltage/frequency, or the output circuit breaker being open. Also, check that the TSC 80 has the correct voltage configuration jumper setting for the correct system voltage, or that the TSC 80E has the correct voltage setting via software programming.
S
Stacey GarnerSep 5, 2025
Why is there no time delay on my THOMSON TS 870?
- T
  tbrownSep 5, 2025
  If you're experiencing no time delay when there should be one with your Thomson Switch, verify the time delay setting of the TSC 80/TSC 80E controller. Another potential cause is that the power switching device's over current protection unit has opened due to a fault on the system. To resolve this, 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.
K
Kimberly Cannon DDSSep 8, 2025
What to do if THOMSON TS 870 Switch motor overheats after transfer?
- A
  amber28Sep 8, 2025
  If the motor overheats and the internal thermal protector opens after a transfer with the Thomson Switch, this could be due to limit switch failure or improper adjustment, or binding or jamming of the transfer mechanism.
D
Donna GonzalezNov 12, 2025
Why does my THOMSON TS 870 transfer to generator source without utility power failure?
- T
  thomassandraNov 12, 2025
  If the THOMSON Switch transfers to the generator source without a power failure in the utility source, it might be due to a few reasons. A Load Test mode may have been activated either locally or remotely, so check the TSC 900 GHC Home Page status indicators. Alternatively, an Exercise Test mode could have been activated by the TSC 900 scheduler, which you can check on the TSC 900 GHC Scheduler page. Also, the utility supply might not be operating at the correct voltage or frequency levels; verify the nominal levels and compare them to the TSC 900 settings. It's also possible that the TSC 900 has incorrect utility voltage or frequency settings, requiring you to reprogram it. Furthermore, the utility power switching device might have tripped open due to an overcurrent condition, activating ...
N
Nicholas HopkinsNov 16, 2025
What to do if THOMSON TS 870 will not re-transfer to utility source upon restoration?
- L
  lisa94Nov 16, 2025
  If your THOMSON Switch won't re-transfer to the utility source after power is restored, there are several potential causes. First, the Utility Return Time delay period in TSC 900 might not have expired yet; verify the TSC 900 time delay setting. It's also possible that a Load Test or Exercise Test mode has been activated; check the TSC 900 GHC Home Page status indicators and Scheduler page, respectively. The utility supply might not be operating at the correct voltage or frequency levels; verify the nominal levels and compare them to the TSC 900 settings for voltage, phase balance, and frequency. The TSC 900 might also have incorrect utility voltage or frequency settings, requiring reprogramming. Additionally, mismatched Utility and Generator Phase Rotation, unplugged TSC 900 connection pl...
P
patrickhensonNov 19, 2025
What to do if THOMSON TS 870 will not transfer to generator after utility source failure?
- L
  Luis BridgesNov 19, 2025
  If the THOMSON Switch will not transfer to the generator source upon failure of the utility source, there are several possible reasons. The warm-up time delay function might not have timed out yet; verify the TSC 900 timer setting. Ensure that the generator set output circuit breaker, which feeds the ATS, is closed. Also, the generator supply might not be operating at the correct voltage or frequency levels; verify the nominal levels and compare them to the TSC 900 settings. The TSC 900 might have incorrect generator voltage or frequency settings for the ATS, requiring you to reprogram it. Additionally, the Generator Phase Rotation may not match the Utility supply; check the phase rotation on the TSC 900 GHC Utility & Generator Voltage Pages. Finally, check that all TSC 900 connection plug...
E
Eric MartinNov 23, 2025
How to fix a THOMSON TS 870 Switch when generator does not start or stop correctly?
- S
  Shawn WilliamsNov 23, 2025
  If the generator on your THOMSON Switch does not start or stop when it should, here are a few things to check: * Verify the remote engine control panel is set to automatic mode. * Ensure the engine start contact is wired correctly from the ATS to the engine control panel. * For single engine applications, confirm that you are using Engine Start Signal #2 contact on the TSC 900 lower terminal block (J10b). * Make sure the TSC 900 Engine start contact terminal block (j10b) is fully inserted into the controller and connected to the correct position. * Check if the TSC 900 SCU Engine Start relay/contact is defective by verifying the Engine start signal LED diagnostic light is illuminated on the SCU when the engine is signaled to start. If the LED is on, verify the contacts are closi...

Summary

Product Revision History

Operating & Service Manual Version

Historical summary of changes made to the product since original release.

Equipment Storage

Equipment Storage Procedures

Procedures for correct storage of the transfer switch prior to installation.

Notes to Installer

Installation Codes;Permits

Permits required by local authorities for installing standby generator sets and ATS.

Application

UL listing and intended applications for emergency power systems per NEC.

Installation Location

Requirements for installation environment, temperature, humidity, and sunlight.

Power Cabling

Requirements for power cabling installation, conduit, ampacity, and connections.

Control Wiring

Requirements for control wiring installation, conduit, sizing, and routing.

Generator Set Automatic Operation

How the TS 870 operates with generator sets using remote automatic starting.

Load Types

Suitable load types and limitations for the TS 870.

Upstream Over Current Protection (Non-Service Entrance Rated)

Requirement for upstream over current protection for non-service entrance models.

Upstream Overcurrent Protection (Service Entrance Rated)

Over current protection for utility source and generator for service entrance models.

Withstand;Interrupting Current Ratings

Reference to electrical ratings for withstand/interrupting current.

Transfer Switches with Integral Over Current Protection

Requirement to set over current protection prior to operation for integrated models.

Transfer Switches with Multi-Tap Voltage Capability

Confirmation of correct system voltage configuration for multi-tap capability.

Remote Start Contact Field Wiring

Guidelines for remote engine start control field wiring.

Dielectric Testing

Warning against dielectric testing with TSC 900 controller connected.

Installation of Open Type Transfer Switches

Reference to factory for additional information on open type installation.

Seismic Anchoring

Information on seismic certification and anchoring requirements.

Anchoring Notes

Details on anchoring design standards, details, and expansion anchors.

General Description

TSC 900 ATS Controller

Description of the TSC 900 microprocessor-based controller and its components.

ATS Power Switching Mechanism

Overview of the four types of ATS power switching mechanisms.

S-Style ATS Mechanism (100 A-800 A, Open Transition)

Details of the S-Style ATS mechanism, its configuration, and operation.

T-Style ATS Mechanism (1000 A-1200 A, Open Transition)

Details of the T-Style ATS mechanism, its configuration, and operation.

MO-Style ATS Mechanism (400 A-800 A Closed Transition)

Details of the MO-Style ATS mechanism for closed transition.

MO-Style ATS Mechanism (1000 A-1200 A Open & Closed Transition)

Details of the MO-Style ATS mechanism for open and closed transition.

Product Model Code

Explanation of the 21-digit product code structure and definitions.

Typical Commissioning Procedures

Safety precautions and general information for commissioning procedures.

Automatic Sequence of Operation

Standard ATS - Open Transition

Describes the automatic sequence for open transition during power failure and return.

Standard ATS - Closed Transition

Describes the automatic sequence for closed transition during power failure and return.

Transfer Control Switch (Open;Closed Transition)

Two positions: Open Transition (break-before-make) and Closed Transition (make-before-break).

Synchronizing Protection

Details on synchronizing protection using TSC 900 in-phase monitor and factory settings.

Closed Transition Time Period

Specifies the time period for parallel operation during closed transition.

Closed Transition Failure Mode Operation

Describes how the TSC 900 monitors and reacts to closed transition failures.

Transfer Fail Alarm (Switching Device Fail to Close)

Explains the transfer fail alarm for switching device failure to close.

Dual Source ATS

Information on optional dual source system configurations.

Dual Utility ATS

How the Dual Utility ATS operates with preferred and standby sources.

Dual Prime Generator ATS

How the Dual Prime Generator ATS operates with preferred and standby generators.

Dual Standby Generator ATS

Operation of Dual Standby Generator ATS in a Master/Slave configuration.

Service Entrance Rated ATS

Notes applicable only to Service Entrance configured transfer switches.

Service Entrance Rated ATS Normal Operation

Describes normal operation for Service Entrance rated ATS.

Over Current Trip

Actions taken by TSC 900 controller during over current trip conditions.

Service Disconnect Procedure

Step-by-step procedure for performing a service disconnect.

Additional Service Disconnect Procedures (S-Style 100 A-800 A Open Transition)

Additional procedures if the Service Disconnected pilot light is not illuminated.

S-Style Mechanism Service Disconnect Procedures

Procedures for manual operation of the transfer switch mechanism to neutral position.

Additional Service Disconnect Procedures (MO Style ATS Mechanism)

Additional procedures for MO Style ATS mechanism service disconnect.

Test Modes

How to test the transfer switch using TSC 900 display or test switches.

Over Current Protection

Standard TS 870 Automatic Transfer Switch

Information on standard models requiring upstream over current protection.

Optional TS 870 ATS with Integral Over Current Protection

Details on optional integral over current protection for utility source.

General Notes on Servicing Transfer Switch Mechanisms

Maintain Mechanical Integrity

Checks for mechanical integrity of transfer switch mechanisms.

Maintain Electrical Integrity

Checks for electrical integrity, connections, and insulation.

Maintain Operational Integrity

Checks for operational integrity of control devices and calibration.

ATS Manual Operating Instructions

S-Style ATS - Manual Operation

Procedure for manual operation of S-Style ATS.

S-Style ATS Manual Operation Steps

Steps for inserting and rotating the manual handle for S-Style ATS.

T-Style ATS - Manual Operation

Procedure for manual operation of T-Style ATS.

T-Style ATS Manual Operation Steps

Steps for pulling and pushing the manual handle for T-Style ATS.

MO Style ATS - Manual Operation

Overview of MO Style ATS manual operation methods.

Electrically Operated ATS Door Push Buttons

Explanation of AUTO and MAN modes for electrically operated push buttons.

Manual Transfer to Gen Supply (Open Transition)

Procedure for manually transferring to generator supply in open transition.

Manual Transfer to Gen Supply Steps

Details on charging the generator power switching device and closing it.

Manual Transfer to Utility Supply (Open Transition)

Procedure for manually transferring to utility supply in open transition.

Manual Transfer to Utility Supply Steps

Details on charging the utility power switching device and closing it.

Mechanically Operated Power Switching Device Push Buttons

Details on mechanical push buttons for power switching devices.

Manual Utility Transfer Steps

Steps for opening the generator power switching device and closing the utility power switching device.

Front View (Typical) 3;4 Pole 100 A-250 A S-Style Transfer Mechanism

Front View (Typical) 3 Pole 400 A-800 A S-Style Transfer Mechanism (Cover Removed)

Front View (Typical) 3;4 Pole MO Style Transfer Mechanism

Cable Terminal Information

Requirements for Upstream Circuit Protective Devices

Withstand Current Ratings (No Integral Overcurrent Protection)

Table of withstand current ratings for models without integral overcurrent protection.

Interrupting Capacity Current Ratings (With Integral Overcurrent Protection)

Table of interrupting capacity current ratings for models with integral overcurrent protection.

Ground Fault Site Test Requirements

Performance Test

Details on performance testing using calibrated current injection apparatus.

Troubleshooting

Will not Re-transfer to Utility Source

Lists probable causes and corrective actions for failure to re-transfer to utility.

Will not Re-transfer to Utility Source (Cont.)

Continues listing causes and actions for failure to re-transfer to utility.

Will not Transfer to Generator Source

Lists causes and actions for failure to transfer to generator.

Will not Transfer to Generator Source (Cont.)

Continues listing causes and actions for failure to transfer to generator.

Transfer to Generator Source Without Utility Failure

Lists causes and actions for transfer to generator without utility failure.

Generator Start;Stop Issues

Lists causes and actions for generator start/stop issues.

Missing Time Delays

Lists causes and actions for missing time delays.

Load Terminals No Power with Apparent Source Connection

Lists causes and actions for apparent source connection issues.

Motor Overheating and Thermal Protector Issues

Lists causes and actions for motor overheating and thermal protection.

GHC Display Issues

Lists causes and actions for GHC display issues.

GHC Display Issues (Cont.)

Continues listing causes and actions for GHC display issues.

Replacement Parts

Replacement Parts Information

Information on ordering replacement parts for the transfer switch.

Component Description and Part Numbers

Table of component descriptions, part numbers, and comments.

Product Return Policy

Notes

Performance Test Form

Appendix A

Typical TS 870 ATS Commissioning Procedures

Procedures for S-Style 100A-800A ATS commissioning.

Pre-Energization Checks

Checks to be performed before energizing the ATS.

Equipment Energization

Procedures for energizing the ATS and checking initial boot-up.

Verify Indicator Lights and Voltage

Verifying indicator lights, generator voltage, phase rotation.

Test Automatic Starting and Transfer

Testing generator start/transfer and utility power outage test.

Appendix B

TS 870 System Voltage Change Procedure

Procedure for changing system voltage on the TS 870.

ATS Potential Transformer Tap Change

Steps for changing voltage transformer primary taps.

TSC 900 Software Programming

Steps for logging in and changing system voltage via software.

Appendix C

Seismic Certification

Certification for seismic applications per AC156.

THOMSON TS 870 Specifications

General

Brand	THOMSON
Model	TS 870
Category	Switch
Language	English

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