UPS 120, UPS 150, UPS 250, UPS 300, UPS 301, UPS 500, UPS 600, UPS 750 and UPS 900 Uninterruptible Power Supplies Caterpillar

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When servicing or repairing electric power generation equipment: Make sure the unit is off-line (disconnected from utility and/or other generators power service), and either locked out or tagged DO NOT OPERATE. Remove all fuses.

Preheat Cycle for the Flywheel

The UPS uses the preheat cycle in order to warm the rotor. Verify if preheat is necessary with the start of the flywheel. There are some different factors that can go into determining if preheat is required or if preheat is not required. Refer to Systems Operation, Testing and Adjusting, RENR9988, "General Information" for an explanation of the process for preheat. Once the preheat cycle is complete, the system will automatically continue with start-up or RPS calibration.

Note: Call technical support for a password in order to bypass the preheat cycle.

Illustration 1	g01258963
SMS Bypass Cabinet (1) Bypass switch (optional) (2) Output switch (optional) (3) Input switch (optional) (4) Upper shield (5) Lower shield (6) GSM circuit breaker (optional)

Illustration 2	g01260515
SMS user interface panel (7) Key switch (8) Soft key (home) (9) LCD display

SMS with Bypass Cabinet

Refer to Illustration 1 for a description of the SMS bypass cabinet. Refer to Illustration 2 for a description of the user interface panel.

Prestart Procedure

1. Turn the key switch (7) to the BYPASS position.

2. Open the output switch (2).

3. Open the input switch (3).

4. Open the bypass switch (1).

Start-up Procedure

1. Apply facility power to the system.

2. Close the input switch (3).

3. Wait while the flywheel cabinet is completing the boot process.

4. Close the output switch (2).

   Note: Verify that the bypass switch (1) is open.

5. Turn the keys witch (7) to the "Online" position.

   The system will enter the "Bypassed-Auto Start" state. The system will begin to charge the flywheel. When the flywheel reaches a rate of 4000 RPM, the system changes to the on-line mode. The system is then operational.

6. Verify that the UPS is in the on-line mode by pressing the"Home" soft key (8) that is located on the user interface panel. Observe the status line on the LCD (9).

SMS without Bypass Cabinet

Refer to Illustration 2 for a description of the User Interface Panel.

Prestart Procedure

1. Turn the key switch (7) to the BYPASS position.

2. Open the external breaker to the SMS Input Bus.

3. Open the external breaker to the SMS output bus.

Start-up Procedure

1. Apply facility power to the open, external input circuit breaker that feeds the SMS Input Bus.

2. Close the external circuit breaker that supplies power to the input bus at the left of the SMS cabinet.

3. Wait while the flywheel cabinet is completing the boot process.

4. Close the external output circuit breaker that connects the system output to the facility load.

   Note: Verify that the bypass switch (1) is open.

5. Turn the key switch (7) on the flywheel cabinet to the "Online" position.

   The system will enter the "Bypassed-Auto Start" state. The system will begin to charge the flywheel. When the flywheel reaches a rate of 4000 RPM, the system changes to the on-line mode. The system is then operational.

6. Verify that the UPS is in the on-line mode by pressing the"Home" soft key (8) that is located on the User Interface Panel. Observe the status line on the LCD (9).