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Chapter 7 - 1+1 Parallel System
System start-up and shutdown procedures (Common battery)
7.5
System start-up and shutdown procedures (Common battery)
The isolators Q1 and Q2, located in the "Auxiliary Battery Distribution Box", must be operated following the
procedures described below. Incorrect operation of these isolators might cause the circuit-breaker located in the
battery cabinet to open or blow the battery fuse located in the UPS.
In the system start-up and maintenance by-pass configuration procedures, the operations must be
performed one at a time, going to the next one only after having completed the previous one on both
UPS modules.
7.5.1
System start-up
Follow the procedure for the single UPS by referring to paragraph 2.2.
After completing the operations described in point 4, and before going to point 5, close isolators
Q1 and Q2 located inside the "auxiliary battery distribution box".
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 leds on
the mimic panel) and will inhibit the "load on bypass" state on the second one. When the second one
becomes available, it will enter the "load on inverter" state and the relative led on its mimic panel will
turn on.
For a system configured in the "power parallel" mode, the two UPS modules will simultaneously
change the state from "load on bypass" to "load on inverter" when both will become available.
7.5.2
System maintenance by-pass configuration procedure
Follow the procedure for the single UPS by referring to paragraph 2.3.
After completing the operation, open isolators Q1 and Q2 located inside the auxiliary box for common
battery.
For a system configured in the "redundant parallel" mode, the changeover from "load on inverter" to
"load on bypass" will take place only when the operation described in point 4 has been completed on
both UPS modules.
7.5.3
Procedure to switch the system from the maintenance by-pass mode to
the normal operating condition
Follow the procedure for the single UPS by referring to paragraph 2.4.
After completing the operations described in point 2, and before going to point 3, close the
isolators Q1 and Q2 located inside the "auxiliary battery distribution box".
Page 7-12
Issue 6
(03/98)
document in response to "powersure ups"
WARNING
7200 Series UPS User Manual
Single Module and 1+1 Parallel System
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