Marathon TS 910 User Manual (English)

Questions and Answers:

A
Andrew SilvaJul 31, 2025
What to do if my Marathon Switch won't re-transfer to the utility source after power is restored?
- R
  Robert KelleyAug 1, 2025
  If the Marathon Switch does not re-transfer to the utility source upon restoration, it might be due to a few reasons. First, check if the TSC 9 Isolation plug is disconnected and reconnect it. Second, the utility voltage might be below 80% of the rated voltage, so check the utility source for adequate voltage. Finally, the transfer switch will automatically bypass an in-phase transfer after 5 minutes, so determine the cause of the alarm and rectify it before the TSC 9 is reset.
J
Joseph RodriguezAug 6, 2025
Why does my Marathon TS 910 Switch transfer to the generator source when there is no power failure?
- L
  lisa85Aug 6, 2025
  If your Marathon Switch transfers to the generator source without a power failure on the utility source, it could be because the utility supply voltage is less than 70% on one or both phases of the nominal voltage. In this case, verify that the TSC 9 has the correct voltage configuration jumper setting for your system voltage.
L
lkaufmanAug 12, 2025
What to do if my Marathon Switch won't transfer to generator after utility power failure?
- J
  Jaime TurnerAug 12, 2025
  If the Marathon Switch won't transfer to the generator source upon failure of the utility source, there are a few potential causes. First, the generator set may not be producing enough voltage/frequency, or the output circuit breaker might be open, so check the generator set output. Second, the warm-up time delay function may not have timed out yet, so verify the TSC 9 timer setting. Finally, if utility voltage is present, the in-phase transfer control may not have detected an ‘in-phase condition to permit transfer, so determine the cause of alarm and rectify before TSC 9 is reset.
S
Steven Marshall MDAug 18, 2025
Why doesn't my Marathon Switch generator start or stop correctly?
- T
  Tom BurnsAug 18, 2025
  If the generator on your Marathon Switch does not start up or stop when it should, there are a few things you can check. First, verify that the remote engine control panel is set for automatic mode. Next, verify that the engine start wiring is on the correct terminals of the TSC 9 controller. Finally, verify the time delay setting of the TSC 9 controller.
D
Dorothy OwensAug 25, 2025
How to troubleshoot a Marathon Switch generator exerciser that isn't working right?
- N
  Nicole HowardAug 26, 2025
  If the Generator Exerciser on your Marathon Switch is not operating correctly, it could be due to a couple of reasons. First, the exercise test may have been incorrectly cancelled before the Genset operated on load for a minimum of 60 seconds. Refer to manual section 18.9.2. Also, an Exercise Alarm condition may have been activated. To resolve this, press and hold the 'E' and 'T' pushbuttons together for 10 seconds until the alarm LED goes out.

Marathon TS 910 Specifications

General

Brand	Marathon
Model	TS 910
Category	Switch
Language	English

Summary

1 PRODUCT REVISION HISTORY

2 EQUIPMENT STORAGE

3 NOTES TO INSTALLER

3.1 APPLICATION

Details the intended application for the TS 910 Transfer Switch, specifying optional standby use only.

3.2 CHECK EQUIPMENT DELIVERY

Instructions for verifying the transfer switch upon delivery and checking for any damage.

3.3 CHECK LINE VOLTAGE/AMPERAGE

Guidance on verifying the line voltage and amperage of the transfer switch against site requirements.

3.4 INSTALLATION REQUIREMENTS

3.4.1 Installation Codes/Permits and ATS Sizing

Requirements for installation codes, permits, and sizing the automatic transfer switch.

3.4.2 Installation Location

Specifies suitable environments and conditions for installing the transfer switch.

3.4.3 Power Cabling

Guidelines for installing power cabling, conduit, and conductor requirements.

3.4.4 SYSTEM PHASING-HIGH LEG DELTA SYSTEMS

Instructions for connecting to 3-phase 4-wire delta systems, emphasizing high leg connection.

3.4.5 Control Wiring

Details on control wiring installation, conduit sizing, and conductor requirements.

3.4.6 Generator Set Automatic Operation

Describes how the TS 910 operates with generator sets for automatic starting.

3.4.7 Upstream Overcurrent Protection (Non-Service Entrance Rated TS 910)

Information on overcurrent protection requirements for non-service entrance rated switches.

3.4.8 Upstream Overcurrent Protection (Service Entrance Rated TS 910)

Details on overcurrent protection for service entrance rated switches.

3.4.9 Withstand/Interrupting Current Ratings

Provides information on the withstand and interrupting current ratings of the transfer switch.

3.5 DIELECTRIC TESTING

3.6 SERVICE DISCONNECT ATS CONFIGURATION

4 GENERAL DESCRIPTION

4.1 PRODUCT MODEL CODE

4.2 TS 910 OPTIONAL ACCESSORIES

4.3 TYPICAL COMMISSIONING PROCEDURES

5 GENERAL THEORY OF OPERATION

5.1 AUTOMATIC SEQUENCE OF OPERATION

Details the step-by-step sequence for automatic operation of the transfer switch.

5.2 SERVICE ENTRANCE AUTOMATIC TRANSFER SWITCH OPERATION

Operation details for service entrance rated automatic transfer switches.

6 OVER CURRENT PROTECTION

6.1 STANDARD TS 910 AUTOMATIC TRANSFER SWITCH

Explains overcurrent protection for standard TS 910 models and their requirements.

6.2 SERVICE ENTRANCE RATED TS 910 AUTOMATIC TRANSFER SWITCH

Details integral overcurrent protection for Service Entrance rated TS 910 models.

7 GENERAL NOTES ON SERVICING TRANSFER SWITCH MECHANISM

8 TRANSFER SWITCH MECHANISM OPERATION

8.1 AUTOMATIC OPERATION

Describes how the TSC 9 controller manages automatic operation of the transfer mechanism.

8.2 MANUAL OPERATION

Procedure for operating the transfer switch manually, emphasizing safety precautions.

9 RECOMMENDED MAINTENANCE

10 FRONT INTERIOR VIEW (100A STANDARD ATS)

11 FRONT INTERIOR VIEW (100A SERVICE ENTRANCE ATS)

12 FRONT INTERIOR VIEW (200A STANDARD ATS)

13 FRONT INTERIOR VIEW (200A SERVICE ENTRANCE ATS)

14 FRONT INTERIOR VIEW (400A STANDARD ATS)

15 FRONT INTERIOR VIEW (400A SERVICE ENTRANCE ATS)

16 ENCLOSURE DIMENSIONS/CABLE TERMINALS

17 REQUIREMENTS FOR UPSTREAM CIRCUIT PROTECTIVE DEVICES

17.1 100A, 2P TRANSFER SWITCH UPSTREAM CIRCUIT PROTECTIVE DEVICES

17.2 100A, 3P TRANSFER SWITCH UPSTREAM CIRCUIT PROTECTIVE DEVICES

17.3 200A, 2P TRANSFER SWITCH UPSTREAM CIRCUIT PROTECTIVE DEVICES

17.4 200A, 3P TRANSFER SWITCH UPSTREAM CIRCUIT PROTECTIVE DEVICES

17.5 400A, 2P TRANSFER SWITCH UPSTREAM CIRCUIT PROTECTIVE DEVICES

17.6 400A, 3P TRANSFER SWITCH UPSTREAM CIRCUIT PROTECTIVE DEVICES

18 TSC 9 Transfer Switch Controller

18.1 DESCRIPTION

Provides a general description of the TSC 9 controller and its function within the transfer switch.

18.2 ELECTROSTATIC DISCHARGE PRECAUTIONS

Details precautions to prevent damage from static electricity when handling the TSC 9 controller.

18.3 DIELECTRIC TESTING

Guidance on performing dielectric testing on the transfer switch, noting isolation requirements for the controller.

18.4 TSC 9 FACEPLATE

Identifies components and indicators on the TSC 9 controller faceplate.

18.5 TSC 9 FACEPLATE LIGHTS AND PUSHBUTTON OPERATION

Explains the operation of TSC 9 controller lights and pushbuttons.

18.6 TSC 9 PRINTED CIRCUIT BOARD

Overview of the TSC 9 controller's printed circuit board and its components.

18.7 TSC 9 OPERATING INSTRUCTIONS

Instructions for operating the TSC 9 controller using front faceplate pushbuttons.

18.8 TSC 9 OPERATING MODE DESCRIPTIONS

Describes various operating modes and alarm logic of the TSC 9 controller.

18.9 TEST MODES

Describes the available test modes for the TSC 9 controller.

18.10 TRANSFER FAIL FAULT RESET

Procedure for resetting a Transfer Fail condition on the TSC 9 controller.

18.11 LAMP TEST

Procedure for initiating a lamp test on the TSC 9 controller.

18.12 TIMER BYPASS

Procedure for bypassing active timing sequences on the TSC 9 controller.

18.13 TSC 9 VOLTAGE SENSING

Explains voltage sensing capabilities and set points of the TSC 9 controller.

18.14 TSC 9 GENERATOR FREQUENCY SENSING

Details frequency sensing capabilities for the generator supply by the TSC 9 controller.

Marathon TS 910 User Manual

Table of Contents