UPSB505 Uninterruptible Power Supply UPS Battery - 50Hz Caterpillar

High voltage levels are present within the UPS. The UPS should be opened only by service personnel that are qualified. The UPS must have a proper ground connection to earth.

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Failure to connect the unit to a suitable grounding electrode creates an electrical shock hazard. An electrical shock will result in serious personal injury or death.

Personal Protective Equipment (PPE) suitable to the work being performed must be worn when performing maintenance on the UPS.

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High voltage is present. Work on this equipment must be performed by authorized trained personnel. Personnel must be wearing Personal Protective Equipment that meets regulatory requirements to protect the body for the work that is being performed. Failure to use appropriate PPE to protect the body will result in serious personal injury or death.

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Performing maintenance inspections with power supplied to the UPS may result in serious personal injury or death. When using an external maintenance bypass, the UPS can be fully de-energized. When using an internal maintenance bypass, the UPS is not fully de-energized. Refer to the Building System Schematic to ensure that all necessary precautions have been taken before performing any maintenance procedure. Use lock out and tag out procedures as required.

The following tests will verify the load transfer sequence and the maintenance bypass operation of the unit.

Configure the UPS for Test mode before beginning this tests as follows:

1. Place the MAINS 1 (Q1) input switch in the On (closed) position.

2. Place the MAINS 2 (Q4S) input switch in the ON (closed) position.

3. Place the output switch in the ON (closed) position.

4. Place the battery disconnects in the ON (closed) position.

5. Place the internal maintenance bypass switch in the OFF (open) position.

6. Turn off the inverter if the inverter is not off already.

Reverse Transfer Operations

1. Ensure that the UPS is in normal operation.

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Illustration 1	g02112699

2. Press and hold the "OFF" button (46) for 3 seconds to stop the inverter.

3. Silence any remaining alarms.

4. Verify the following on the graphical display:
   • The voltage transfers from the output bus to the static bypass.

   • The "Normal Mode Load Not Protect" message is present.

   • The "UPS ON" LED (49) is not illuminated.

   • The audible alarm activates.

   • The audible alarm can be silenced.

Forward Transfer Operations

1. Press the "ON" button (47) .

2. Verify the following:
   • The voltage transfers from the output bus to the inverter.

   • The "Normal Mode Load Protected" message is present on the graphical display.

   • The "UPS ON" LED (49) is illuminated green.

Maintenace Bypass Operation

Note: During this operation, do not open the Mains 1 (Q1) input switch. If this switch is opened, you will have to wait a minimum of 5 minutes before the UPS can be restarted. This period allows the DC capacitors to discharge.

1. Transfer to the internal maintenance bypass.

   1. Ensure the UPS is in normal operation.

   2. Press and hold the "OFF" button (46) for 3 seconds to stop the inverter.

   3. Silence any alarms and verify that the load transfers to the static bypass.

   4. Close the maintenance bypass switch.

   5. Open the UPS output isolation switch and verify that the load is supplied by the maintenance bypass.

2. Perform the following actions if an external maintenance bypass cabinet (MBC) is present.

   1. Close the MBC using the maintenance bypass switch.

   2. Open the MBC use the UPS Isolation switch and verify that the load is supplied by the maintenance bypass.

   3. When the MBC is a 3-CB configuration, open the UPS input switch.

      Note: If the UPS is a single feed installation with the Mains 1 Input switch and Mains 2 Input switch both receiving power from the MBC bypass input switch, then input power to the UPS has been turned off. Open QF1 and wait for a minimum of 5 minutes for the DC capacitors to discharge before proceeding.

3. Return the load to the UPS static bypass following normal operating procedures.

4. Return the UPS to normal operation and verify that the load is supplied by the inverter.