Liebert Hipulse E - Page 117

Chapter 11 – ‘1+N System’ Liebert Hipulse E User Manual
Single or '1+N' UPS System
Page 11-4 (07/04)
11.2.1.2 Switching OFF and isolating one UPS while the other remains in service.
1. In sequence, open the UPS isolators Q4 (output), Q1 (rectifier input), Q2 (bypass input).
2. Open the battery circuit breaker .
To completely isolate the UPS, open the a.c. power supply circuit-breaker (both circuit-breakers if separate supplies are
provided for the rectifier and the bypass supply) and the output circuit-breaker on the power distribution switchboard.
WARNING
If individual UPS output isolation circuit-breaker are not installed on the power distribution switchboard,
remember that voltage supplied by the others UPS which remains in service will still be present on the output
terminals of the shutdown UPS.
WARNING: Wait 5 minutes for the internal d.c. bus bar capacitors to discharge.
11.2.1.3 Switching ON a UPS that was previously switched OFF and isolated from the system.
1. Close the circuit-breakers relative to the shutdown UPS that were previously opened on the power distribution
switchboard.
2. Close the switches Q1 (rectifier input) and Q2 (bypass input) of the UPS.
3. Select the MEASUREMENT function from the display on the main menu, then press ENTER and select
BATTERY. Press ENTER and check that the voltage level has reached the rated value (432V or 446V or 459V in
accordance with the number of battery blocks).
4. Close the battery circuit breaker .
5. Close UPS switch Q4 (output), wait about 20 seconds and check that the message NORMAL OPERATION
appears on the display operator panel.
11.2.1.4 Complete system shutdown.
Follow the procedure described in Chapter 9  Operating Instruction: paragraph 9.6 by working on several UPS
modules.
11.2.1.5 Complete system reset.
Follow the procedure described in Chapter 9  Operating Instruction: paragraph 9.7 by working on several UPS
modules.