Parallel system and critical load shutdown, Using the ups load off pushbutton – Powerware 9390 UPS 100160 kVA User Manual
Page 118
UPS OPERATING INSTRUCTIONS
EATON Powerware
®
9390 UPS (20–80 kVA) Installation and Operation Manual
S 164201603 Rev 2 www.powerware.com
9-10
3.
Close the UPM input feeder circuit breaker.
4.
If the UPM is dual feed, close the UPM Bypass input feeder circuit breaker.
5.
Press the CONTROLS pushbutton on the main menu bar of the UPM. The System
Controls screen appears.
6.
On the System Controls screen, the power module (PM) status should indicate
SHUTDOWN.
7.
Press the NORMAL pushbutton on the System Controls menu bar of the UPM.
8.
Observe the following messages appear sequentially on the power module (PM)
status line of the UPM:
DC STARTING
INVERTER STARTING
INVERTER SYNCING
READY
ONLINE
The rectifier and inverter turn on. When the inverter reaches full voltage, the
UPM synchronizes with the output and closes output contactor K3. The UPM is
online and in Normal mode with the NORMAL status indicator illuminated and in
parallel with the other system UPMs.
9.
Close battery breakers for the UPM any time after INVERTER SYNCING or
CLOSE BATTERY appears on the display.
9.2.7
Parallel System and Critical Load Shutdown
To perform maintenance or service on the critical load, shut down power to the load
by performing the following procedure:
C
A
U
T
I
O
N
Using the following procedure removes all output from the critical load. You should use this procedure only
when you need to de‐energize both the parallel system and the critical load.
1.
Turn off all equipment that is being powered by the parallel system.
2.
Press the CONTROLS pushbutton on the main menu bar on any UPM. The
System Controls screen appears.
3.
Press the BYPASS pushbutton on the System Controls menu bar of any UPM.
The UPMs transfer to Bypass mode.
4.
Press the pushbutton to display System Controls Screen 2.
5.
Press the PM OFF pushbutton on the System Controls menu bar.
The
power module (PM)
status indicates
SHUTDOWN
.
The input and output
contactors open, the battery breaker or disconnect is tripped, and the power
module is turned off. The bypass source supplies the critical load.
6.