7.2.1Normal Mode
In Normal mode, utility AC power is supplied to the UPMs. Power from the output of the UPMs is then supplied to the SSBM for parallel operation. The SSBM then supplies the critical load with clean, filtered AC power. The message “System Normal” appears in the status area of the Control Panel LCD screen.
Figure 7---1 shows the path of electrical power through the Parallel Capacity/Redundant system when operating in Normal mode.
UPM
INPUT
UPM1
BATT
UPM2
BATT
UPM3
BATT
UPM4
BYPASS
INPUT
SSBM |
|
| FBP |
CBP |
|
(open) | SS |
|
CBS
OUTPUT TO
CRITICAL
LOAD
BATT
Path of Electrical Power
Figure 7---1. Path of Current Through the Parallel Capacity/Redundant System
in Normal Mode.
If the utility AC power is interrupted or is out of specification, the UPMs automatically switch to Battery mode to support the critical load with no interruption. When utility power returns, the UPMs return to Normal mode.
If the UPMs becomes overloaded or unavailable, the SSBM switches to Bypass mode. The SSBM automatically returns to Normal mode when the error condition is cleared and system operation is restored within specified limits.
Powerware 9315 Parallel Capacity/Redundant System with PHP SSBM | |
| 164201373 Rev. A 092402 |
