7200 Series UPS User Manual Chapter 7 - 1+1 Parallel System
Single Module and 1+1 Parallel System Optional Equipment
document in response to "powersure ups"
Page 7-7
Issue 6
(03/98)
7.3 System start-up and shutdown procedures (Separate batteries)
These operations must be performed one at a time, progressing to the next step only after having
completed the previous step on both UPS modules.
7.3.1 System start-up
Follow the procedure for the single UPS by referring to paragraph 2.2.
For a system configured in the “redundant parallel” mode, the first of the two UPS modules available
will change its state from “load on bypass” to “load on inverter” (turning on and off the relative mimic
leds) and will inhibit the “load on bypass” message on the second module. When the second module
becomes available, it will enter the “load on inverter” state and this led on the mimic panel will turn on.
For a system configured in the “power parallel” mode, the two UPS modules will simultaneously
change from “load on bypass” to “load on inverter” when both will become active.
7.3.2 Switching the system to maintenance bypass from normal operation.
Follow the procedure for the single UPS by referring to paragraph 2.3.
For a system configured in the “redundant parallel” mode, the changeover from “load on inverter” to
“load on bypass” will occur only when the operation described in point 4 has been completed on both
UPS modules.
7.3.3 Switching the system ON from a maintenance power down condition.
Follow the procedure for the single UPS, referring to paragraph 2.4.
7.3.4 Switching OFF and isolating 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 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.
If individual UPS output isolation circuit-breaker are not installed on the power distribution
switchboard, remember that voltage supplied by the UPS which remains in service will still be present
on the output terminals of the shutdown UPS.
Wait approximately 5 minutes before accessing the interior of the equipment to allow all the internal
capacitors to discharge.
7.3.5 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).
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 message page display.
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