Powerware 9315 - Manual (Page 41)

35 Powerware 9315 Parallel Redundant System I & O
164202013 Rev. D 041599
Operating Instructions for
the Parallel Redundant System
The following procedures are for the operation of UPS modules in parallel. After
installation of the parallel redundant system, the UPS modules run in parallel with
each other.
Module Output Breakers (MOBs)
The parallel cabinet contains two MOBs labeled MOB 1 and MOB 2. The UPS
modules should be labeled in accordance with which MOB it is connected (e.g.,
MOB 1 should be wired to UPS 1).
When both MOB 1 and MOB 2 are closed, each UPS module operates as part of a
parallel system. When one MOB is open, the redundant UPS module continues to
support the critical load. The redundant UPS module acts as a single stand-alone
system.
How to Open and Close the MOB
CAUTION:
Improper operation of these circuit breakers can cause the loss of the critical
bus (output) or damage equipment.
Close the MOB only when its designated OK TO CLOSE lamp is illuminated.
A UPS module’s designated MOB, MOB 1 or MOB 2, may be opened if the MOB
for the redundant module is closed and its OK TO CLOSE lamp is illuminated.
Refer to How to Isolate a Module in this chapter for information on when a module’s
designated MOB can be opened.
Starting and Stopping Using Parallel Redundant System
Start each module as described for normal UPS system startup in the PowerwareÒ
9315 Operation manual provided with the UPS system. If the MOBs have been
opened, they should only be closed when the OK TO CLOSE lamp is illuminated.
The following descriptions give details on starting in modes, turning the module off,
and using the LOAD OFF pushbutton.