Eaton 9355 Series - Parallel Bypass

Eaton 9355 Parallel UPS (10/15 kVA) User's Guide 164201601—Rev E0 57
3. If present, switch the maintenance isolation breaker (MIS) on the parallel tie cabinet to the OFF position;
otherwise, switch the UPS breakers (may be designated MOB or UPS) on the parallel tie cabinet to the
OFF position.
To return to Normal Mode from maintenance bypass:
1. Verify that the maintenance isolation breaker (if present) on the Tie Cabinet is in the OFF position or all of
the UPS breakers are in the OFF position.
2. Switch on utility power where the UPSs are connected.
In a parallel capacity system (N+0 or N+1), apply utility to the minimum number of UPSs required for
capacity.
The
Eaton 9355 Parallel UPS (10/15 kVA) User's Guide S 164201601 Rev B
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Chapter 10 Parallel Bypass
To switch the parallel UPS to maintenance bypass from Normal mode:
1. From any UPS, set the system to internal Bypass mode:
S Using the button on the front panel display, scroll to the Control
menu option and press the
button.
S Press the button to select the Go to Bypass Mode option.
The
indicator illuminates and the indicator extinguishes,
indicating the UPS system is operating in Bypass mode.
2. Switch the bypass breaker (may be designated MBP or CBP) in the
parallel tie ca binet to the ON position.
3. If present, switch the maintenance isolation breaker (MIS) on the
parallel tie ca binet to the OFF position; otherwise, switch the UPS
breakers (may be designated MOB or UPS) on the parallel tie
cabinet to the OFF position.
To return to Normal mode from maintenance bypass:
1. Verify that the maintenance isolation breaker (if present) on the Tie
Cabinet is in the OFF position or all of the UPS breakers are in the
OFF position.
2. Switch on utility power where the UPSs are connected.
In a parallel capacity system (N+0 or N+1), apply utility to the
minimum number of UPSs required for capacity.
The
indicator illuminates, indicating the UPS system is
operating in Bypass mode.
The display indicates On Manual/Maintenance Bypass.
3. Verify voltage is present on the UPS output by checking that an
output voltage reading present on the front panel LCD display.
The load is now powered by utility power.
indicator illuminates, indicating the UPS system is operating in Bypass mode.
The display indicates On Manual/Maintenance Bypass.
3. Verify voltage is present on the UPS output by checking that an output voltage reading present on the front
panel LCD display.
The load is now powered by utility power.
4. If present, switch the maintenance isolation breaker (MIS) on the wall-mounted bypass cabinet to the ON
position; otherwise, switch the UPS breakers (may be designated MOB or UPS) on the wall-mounted
bypass cabinet to the ON position.
5. Switch the bypass breaker (may be designated MBP or CBP) in the wall-mounted bypass cabinet to the
OFF position.
The UPS is now powering the load in Bypass mode.
NOTE Use the same UPS that was used to set internal bypass to return the parallel system to
Normal mode.
6. On the same UPS front panel, set the UPS to Normal mode:
• Press the
OPERATION
Eaton 9355 Parallel UPS (10/15 kVA) User's Guide S 164201601 Rev B
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The following table shows the indicator status and description.
Indicator Status Description
Green
On The UPS is operating normally.
Flashing S The UPS is starting up or is shut down and waiting for power to return.
S A new information message is active.
S Bypass is not available.
Off The UPS is turned off and will not turn on automatically.
Yellow
On The UPS is in Battery mode.
Yellow
On The UPS is in Bypass mode.
Red
On The UPS has an active alarm.
Flashing There is a new UPS alarm condition. See “Troubleshooting” on page 67 for
additional information.
Changing the Language
Press and hold the first button on the left for a pproximately five seconds
to selec t the language menu. This action is possible from any LCD menu
screen.
Display Functions
As the default or after 15 minutes of inactivity, the LCD displays the
selectable s tartup screen. The default is the Eaton logo and can be
changed to the Mimic sc reen in the User Settings menu.
The bac klit LCD automatically dims after a long period of inac tivity. Press
any button to restore the screen.
Use the two middle buttons (
and ) to scroll through the menu
structure. Press the
button to enter a submenu. Press the button
to select an option. Press the
ESC
button to cancel or return to the
previous menu.
button to select the Go to Normal Mode option.
• Each UPS goes to Normal mode.
The UPS is now powering the load in Normal mode.
Operation