User Manual for Lead Acid Interactive UPS
04/22v.1
Page 11
VD-Series (5000VA-10kVA)
Chatsworth Products (CPI)
2.2.3 Maintenance Bypass Distribution Module Operation
Transfer to Maintenance Bypass
To transfer to maintenance bypass from UPS, follow the below steps:
Step 1: Press “OFF” button of UPS unit to transfer to bypass mode.
Step 2: Open the maintenance switch door. If step 1 is not executed first, then UPS unit will transfer to
bypass mode automatically with control output signal connection when opening the maintenance switch
door.
Step 3: Transfer rotary switch to “BPS” position and switch off UPS input breaker on the module. Then,
all devices are directly powered by utility and there is no current through the UPS. The output and input
of UPS are isolated from the system. You may now service or maintain the UPS by shutting down the
batteries of UPS.
Transfer to UPS Protection
After maintenance service is done, follow below steps to transfer back to UPS operation.
Step 1: Switch on the input breaker of the module and reconnect UPS battery input breaker. Then UPS
will enter to bypass mode.
Step 2: Transfer rotary switch to “UPS” position. Then, all devices are powered by utility through UPS
bypass mode.
Step 3: Close back maintenance switch door and press “ON” button of UPS unit. Then, all devices are
protected by the UPS.
NOTE
: If maintenance will be executed in another place, before removing the UPS and the module,
please follow steps of “Transfer to Maintenance Bypass” and then disconnect all wires between UPS
and the module for complete isolation.
2.2.4 Specification of Critical Components
Parameter
5K/6K Max.
10K Max.
Input breaker
Current
50 A
63 A
Voltage
250 V
250 V
Bypass switch
Current
80 A
80 A
Voltage
600 V
600 V