UPSB220 Uninterruptible Power Supply Caterpillar

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.

Perform the following steps for a functional check of the UPS system.

1. Ensure that the Rectifier/charger light (1), the Battery light (2), and the Static-bypass light (3) on the control panel are not red. This observation is to avoid an interruption in the supply of power to the load due to incorrect transfer conditions or a battery problem.

2. Press the Inverter OFF button (8). Check that the buzzer (6) and control panel lights function correctly. Refer to Operation and Maintenance Manual, "Modes of Operation".

3. Press the Inverter ON button (7). Check again that the control panel lights function correctly.

4. Run a transfer to battery test.

   1. With the inverter on, open input circuit breaker Q1 (32) .

      The orange "battery" light (2) on the control panel should illuminate.

   2. After 2 minutes on battery power, close input circuit breaker Q1 (32) .

      The rectifier/charger (A) should automatically restart. The orange "battery" light (2) on the control panel should go off.