UPSB220 Uninterruptible Power Supply Caterpillar

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Working with electrical circuits is hazardous. Bodily contact with electrical potential will cause personal injury or death. Ensure that personnel are trained in proper operating procedures in order to ensure safe operation.

Parallel UPS Unit for Increased Output

Illustration 1	g02361044
Control Panel (1) Rectifier/charger light (2) Battery light (3) Static-bypass light (4) Inverter light (5) Load light (6) Buzzer (7) Inverter ON button (8) Inverter OFF button (9) Scroll Up/Increment key (10) Scroll Down/Decrement key (11) Validate key (12) Main Menu key (13) Voltage Measurement key (14) Current Measurement key (15) Frequence and Power Measurement key (16) Anomaly light (17) Primary Message key (18) Battery key (19) Forced-transfer (20) Alarm reset (21) Buzzer reset (22) Display

Illustration 2	g02345901
Circuit Breaker Diagram The fuses are to protect against catastrophic rectifier and inverter semiconductor failure that could be caused by the normal AC source or the load.

Normal AC input (30) - Three-phase 480 VAC 60 Hz line voltage. Utilized in Normal operation to support the load.

Bypass AC input (31) - Three-phase 480VAC 60Hz line voltage utilized in Bypass or Maintenance operations to support the load.

Q1 (32) - Isolates the rectifier/charger (A) from the normal AC source (30). Q1 is a molded circuit breaker.

Rectifier/charger module (A) - Converts three-phase AC power from the normal AC source supply (30) into DC power for the normal inverter (B) input. This module float charges or recharges the battery (D) .

Inverter module (B) - Converts the DC power supplied by the rectifier/charger module (A) or the battery unit (D) into three-phase AC power for the load.

Q5N (33) - Q5N is a switch that can isolate the UPS system from the load.

QF1 (34) - QF1 is a circuit breaker for battery (D) protection and isolation.

Battery unit (D) - The battery unit provides backup power for the inverter (B) in the event of a voltage drop or a normal AC input (20) failure.

Static bypass module (C) - Ensures the instantaneous transfer of the load to the bypass AC source input (31) in the event of an inverter (B) shutdown. The shutdown can be initiated by the user, by a protective device, or a sudden load.

Q4S (36) - Q4S is a switch that isolates the static bypass (C) from the bypass AC source input (31) .

Q3BP (35) - Q3BP is a switch to isolate the UPS for maintenance. During maintenance the Q3BP transfers the load to the bypass AC source input (31) without interrupting the supply of power.

Note: The normal AC input and the bypass AC input have different functions. Depending in the installation, each input may be protected differently upstream and/or come from different sources.

Illustration 3	g02362617
(7) Inverter ON button (8) Inverter OFF button (23a) "Q3BP" (24a) "Q5N" (25) "Q4S" (26) "QF1" (27) "Q1"

Parallel UPS Startup

Use the following steps to start the UPS:

1. Ensure that all load devices are off or that the load is disconnected.

2. Close the upstream switches supplying normal and bypass AC source power on the LV switchboard.

3. Close normal AC input switch Q1 (27) .

   The system powers up in the following sequence:

   • Rectifier/charger automatically starts

   • Rectifier/charger green light (1) on the control panel illuminates

   • Battery light (2) on the control panel turns red

4. Close battery circuit breaker QF1 (26) .
   • Battery light (2) on the control panel goes off

   • Green Static-bypass light (3) and green Load light (5) on the control panel illuminate

5. Close "Main 2" input switch Q4S (25) for the units.

6. Close inverter output switch Q5N (24) for the inverters and in the external bypass unit (24a) .

7. Open maintenance bypass switch Q3BP (23a) in the external bypass unit.

8. Press the inverter ON button (7) on the control panel
   • The green inverter light (4) on the control panel flashes

   • The inverter starts. Ef the bypass AC source transfer conditions are satisfied and on-line mode is selected, the load is transferred to the inverter.

9. When a sufficient number of inverters are ready, the inverter-output contactors close.
   • The green inverter light ( 4) on the control panel for the on-line mode illuminates.

   • The green static-bypass light (3) on the control panel goes off.

Parallel UPS Shutdown

Use the following steps to shut down the UPS.

The UPS system is no longer protecting the electrical load. The UPS continues to be supplied with AC power. Maintenance or servicing for the UPS can now be carried out.

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Bodily contact with electrical potential can cause bodily injury or death. To avoid the possibility of injury or death, ensure that the main power supply has been disconnected before performing any maintenance or removing any modules.

1. Shut down the UPS by pressing the OFF button (8) for 3 seconds.

   The load is no longer protected by the UPS.

2. Close bypass switch "Q3BP" (23) .

3. Open isolating switch "Q5N" (24) .

4. Open isolating switch "Q4S" (25) .

5. Open isolating switch "QF1" (26) .

6. Open isolating switch "Q1" (27) .

   Note: Wait a minimum of 5 minutes for the capacitors to discharge. Ensure that the capacitors are at zero energy prior to performing maintenance within the cabinets.

7. Wait until the display and LED lights go off.