Automatic Transfer Switches CTG, CTGD Series Caterpillar

For the CTSD transfer switches, there is a delay timer which delays the transfer from OPEN to EMERGENCY. There is also a delay timer that delays the transfer from OPEN to NORMAL.

Initial Start-Up

Illustration 1	g00827163

Before starting the operation test, check the nameplate rating on the transfer switch in order to verify that the system voltage is correct. An example of the nameplate is shown in illustration 1.

Illustration 2	g00829994

Make sure that you have read all of the information about the options and the accessories that are provided on the ATS. Make sure that you understand all of the information about the options and the accessories that are provided on the ATS. After all of the options and the accessories are understood, follow the following steps in order to set up the ATS. Refer to illustration 2. The LED indicators illuminate in order to indicate the following information: the sources that are available, the position of the switch and the control function of the MX100.

Note: If the LED indicators are flashing, refer to Service Information, "Troubleshooting".

1. If the transfer switch is equipped with the Disconnect Switch ("DS"), turn the switch to the INHIBIT. Close the external circuit breaker for the normal power source. The "NORMAL AVAILABLE" and the "NORMAL POSITION" LED indicators will illuminate. If the "NORMAL AVAILABLE" LED does not illuminate, verify that the source voltage is above the pickup value. On the initial start-up, the "DELAY ENGINE STOP" LED will illuminate for the duration of the engine stop timer.

   Note: The generator set will start and the generator set will run while the engine stop timer is running.

2. Close the external circuit breaker for the emergency power source. Start the generator set in the "MANUAL" mode. When the voltage and frequency reach preset values, the "EMERGENCY AVAILABLE" LED will illuminate.

3. Check the voltages at the terminals for the emergency power source. Verify that the phase rotation of the emergency power source is equal to the phase rotation of the normal power source.

4. After the sources have been verified, shut down the generator set. Put the generator set control in the automatic position. The "EMERGENCY AVAILABLE" LED will turn off.

   Note: The generator set will continue to run if the "DELAY ENGINE STOP" LED is illuminated.

5. If the transfer switch is equipped with the Disconnect Switch ("DS"), turn the switch to ENABLE. Make a final inspection of the ATS. Close the cabinet door and lock the cabinet door.

6. Run the appropriate test. The appropriate test is determined by the model of the transfer switch.

CTG Test

1. Close the circuit breaker for the normal power source.

   The controller will illuminate the "NORMAL AVAILABLE" LED. The "NORMAL AVAILABLE" LED is illuminated in order to show that the normal power source is available.

2. Check the voltages at the terminals for the normal power source.

3. Close the circuit breaker for the emergency power source.

4. Start the generator set.

   The controller will illuminate the "EMERGENCY AVAILABLE" LED. The "EMERGENCY AVAILABLE" LED is illuminated in order to show that the emergency power source is available.

5. Check the voltages at the terminals for the emergency power source.

6. Use a phase rotation meter in order to verify that the phase rotation of the emergency power source is equal to the phase rotation of the normal power source.

7. Shut down the generator set.

8. Put the generator set control in the automatic position.

9. Complete a visual inspection of the transfer switch.

10. Close and lock the cabinet door.

11. Initiate the test by pressing the "TEST" button on the keypad of the controller.

    Press the test button and hold the test button until the switch transfers to the emergency power source.

    Note: Releasing the "TEST" button before the switch transfers to the emergency power source will terminate the test.

12. In order to start the transfer back to the normal power source, release the "TEST" button.

    The transfer switch will complete the transfer back to the normal power source after the delay for the transfer to the normal power source has elapsed. The engine cooldown timer allows the generator set to run without a load for a preset cooldown period.

CTGD Test

1. Close the circuit breaker for the normal power source.

   The controller will illuminate the "NORMAL AVAILABLE" LED. The "NORMAL AVAILABLE" LED is illuminated in order to show that the normal power source is available.

2. Check the voltages at the terminals for the normal power source.

3. Close the circuit breaker for the emergency power source.

4. Start the generator set.

   The controller will illuminate the "EMERGENCY AVAILABLE" LED. The "EMERGENCY AVAILABLE" LED is illuminated in order to show that the emergency power source is available.

5. Check the voltages at the terminals for the emergency power source.

6. Verify that the phase rotation of the emergency power source is equal to the phase rotation of the normal power source.

7. Shut down the generator set.

8. Put the generator set control in the automatic position.

9. Complete a visual inspection of the transfer switch.

10. Close and lock the cabinet door.

11. Initiate the test by pressing the "TEST" button on the keypad of the controller.

    Press the test button and hold the test button until the switch transfers to the emergency power source. A delay timer delays the transfer from OPEN to EMERGENCY.

    Note: Releasing the "TEST" button before the switch transfers to the emergency power source will terminate the test.

12. In order to start the transfer back to the normal power source, release the "TEST" button.

    The transfer switch will complete the transfer back to the normal power source after the delay for the transfer to the normal power source has elapsed. A delay timer delays the transfer from OPEN to NORMAL. The engine cooldown timer allows the generator set to run without a load for a preset cooldown period.