Operating Procedures
6.12Isolating One Module in a Multi-Module System
NOTE
The
1. With all UPS modules in the system in Normal mode, open the external output isolator.
NOTE
Opening the external output isolator under these condtions puts the UPS module into Standby mode. This is indicated by a flashing inverter LED and the message “Check UPS output.”
An “Inverter asynchronous” alarm is also normal. The remaining UPS modules will remain on line and “Parallel comm fail” will annunciate.
2.Press the UPS EPO to isolate the batteries.
3.Open the UPS door to gain access to the main power switches SW1 and CB1.
4.Turn the rotary switch (SW1) to the Bypass position then continue to rotate to Test.
NOTE
With the UPS external output breaker open and auxiliary switches closed the UPS control will enable the UPS switch to be rotated through “Bypass” without initiating the remaining on line UPS modules to transfer to Bypass.
5. Open rectifier input breaker CB1.
! WARNING
Hazardous Battery Voltage
No operator serviceable parts are located behind covers that require a tool for their removal. Only qualified service personnel are authorised to remove such covers.
The UPS battery and connecting terminals remains energized at hazardous voltage levels at all times. The battery is located behind protective covers that require a tool for their removal: inside the UPS cabinet, inside a
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