Switching Off And Isolating Isolation One Ups While The Other Remains In Service; Switching On A Ups That Was Previously Switched Off And Isolated From The System; Complete System Shutdown - Liebert 7200 Series User Manual

7200 Series UPS User Manual
Single Module and 1+1 Parallel System
7.5.4 Switching OFF and isolating isolation one UPS while the other remains in
service.
This operation is permitted only for a system configured in the "redundant parallel mode".
1. In sequence, open the UPS switches Q4 (output), Q1 (rectifier input), Q2 (bypass input).
2. Open the isolator located inside the battery auxiliary distribution box, relative to the UPS that is
being excluded.
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 input) and the output circuit-breaker on
the power distribution switchboard.
If the output circuit-breaker of the single UPS is not installed on the power distribution switchboard,
remember that voltage supplied by the UPS which has remained in service will still be present on the
output terminals of the shutdown UPS.
Wait about 5 minutes before accessing the interior of the equipment to allow all the internal capacitors
to discharge.
7.5.5 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).
If this occurs, proced the next step.
If this does not occur and a voltage close to 0V is measured, this means that the active UPS is
operating under the battery charge current limiting condition.
In this case, open Q1 (rectifier input) then open the circuit-breaker located inside the battery
cabinet, close Q1 again and check the voltage level on the display. The battery circuit-breaker must
be closed again after completing the operation described in point 4.
4. Close the isolator located inside the battery auxiliary distribution box, for to the UPS which has
been switched ON.
5. Close UPS switch Q4 (output), wait about 20 seconds and check that the message NORMAL
OPERATION appears on the message page display.
7.5.6

Complete system shutdown.

Follow the procedure described in paragraph 2.5 by working on both UPS modules.
After completing the operation, open isolator Q1 and Q2 located in the battery auxiliary distribution
box.
System start-up and shutdown procedures (Common battery)
document in response to "powersure ups"
Chapter 7 - 1+1 Parallel System
Page 7-13
Issue 6
(03/98)