Powerware 9315s - Manual (Page 63)

7--11 Powerware 9315 Parallel Capacity/Redundant System with PHP SSBM
164201373 Rev. A 092402
7.3.1 Maintenance Bypass Mode (Optional)
The Parallel Capacity/Redundant system can be manually transferred to
maintenance bypass if the System Maintenance Bypass (SMB) has been provided.
Maintenance bypass is used when the system is not operating or is in need of
service. The maintenance bypass source supplies the commercial AC power to the
load directly. The SMB is configured with electrical interlocks.
CAUTION:
The critical load is not protected while the Parallel Capacity/Redundant
system is in Maintenance Bypass mode.
Figure 7---6 shows the path of electrical power through the Parallel
Capacity/Redundant system when operating in Maintenance Bypass mode.
UPM1
UPM2
UPM3
UPM4
SS
FBP
CBP
CBS
BYPASS
INPUT
OUTPUT TO
CRITICAL
LOAD
BATT
UPM
INPUT
BATT
BATT
BATT
SSBM
SMB
MIS MBP
MAINTENANCE
BYPASS
INPUT
Path of Electrical Power
(open)
Figure 7---6. Path of Current Through the Parallel Capacity/Redundant System
in Maintenance Bypass Mode.