2.
Select EAA Controls.
3.
Select Enable VMMS.
The entire UPS system transfers to the Variable Module Management
System mode and the critical load is supplied by the bypass source. If the
bypass source is not available or the conditions are not correct for the
VMMS mode, the power module remains on and an alarm sounds. The
green status indicator for normal operation is illuminated. The UPS status
is shown as
UNIT ONLINE, VMMS
. The UPM status is shown as
READY
.
7.3.8
Transferring from the Variable Module Management System
mode to the double conversion mode
Note: Note that theVariable Module Management System mode commands
are displayed only if enabled at the factory or by an authorized Eaton
Customer Service Engineer.
To transfer the critical load to the double conversion mode:
1.
In the home screen, press Controls.
2.
Select EAA Controls.
3.
Select Disable VMMS.
The UPS system transfers to the battery mode and then to the double
conversion mode. If the power module is not available, the system remains
in the bypass mode and an alarm sounds. The green status indicator for
normal operation is illuminated. The UPS status is shown as
UNIT
ONLINE
. The UPM status is shown as
ACTIVE
.
7.3.9
Shutting down the UPS system and critical load
To perform maintenance or service on the critical load, shut down the power to
the load by performing the following procedure:
1.
Turn off all the equipment that is powered by the UPS system.
2.
Perform the LOAD OFF procedure (see Section
).
The input, output, and bypass backfeed contactors open, the battery
breaker or disconnect is tripped, and the power module is turned off.
3.
Open the UPS front door.
4.
Open the rectifier input switches.
5.
Check that the battery breaker is open.
6.
Close the UPS front door.
7.
Open the UPS input and bypass feeder circuit breakers.
8.
Repeat steps 3–7 for all the UPSs in the system.
Eaton 91PS/93PS UPS 8–40 kW
User's and installation guide
©
Eaton Corporation plc 2018. All rights reserved.
Revision: 005
Document ID: P-164000493
92 (117)
