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Parallel Bypass
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 switch the parallel UPS to maintenance bypass from Normal mode:
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
1.
From any UPS, set the system to internal Bypass mode:
the UPS breakers are in the OFF position.
S
Using the
2.
Switch on utility power where the UPSs are connected.
menu option and press the
In a parallel capacity system (N+0 or N+1), apply utility to the minimum number of UPSs required for
S
Press the
capacity.
The
The
indicating the UPS system is operating in Bypass mode.
The display indicates On Manual/Maintenance Bypass.
2.
Switch the bypass breaker (may be designated MBP or CBP) in the
3.
Verify voltage is present on the UPS output by checking that an output voltage reading present on the front
parallel tie cabinet to the ON position.
panel LCD display.
3.
If present, switch the maintenance isolation breaker (MIS) on the
The load is now powered by utility power.
parallel tie cabinet to the OFF position; otherwise, switch the UPS
4.
If present, switch the maintenance isolation breaker (MIS) on the wall-mounted bypass cabinet to the ON
breakers (may be designated MOB or UPS) on the parallel tie
position; otherwise, switch the UPS breakers (may be designated MOB or UPS) on the wall-mounted
cabinet to the OFF position.
bypass cabinet to the ON position.
To return to Normal mode from maintenance bypass:
5.
Switch the bypass breaker (may be designated MBP or CBP) in the wall-mounted bypass cabinet to the
OFF position.
1.
Verify that the maintenance isolation breaker (if present) on the Tie
The UPS is now powering the load in Bypass mode.
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
6.
On the same UPS front panel, set the UPS to Normal mode:
minimum number of UPSs required for capacity.
button to enter a submenu. Press the
•
ESC
button to cancel or return to the
The
•
operating in Bypass mode.
The UPS is now powering the load in Normal 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.
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164201601 Rev B
The load is now powered by utility power.
button on the front panel display, scroll to the Control
button to select the Go to Bypass Mode option.
indicator illuminates and the
indicator illuminates, indicating the UPS system is operating in Bypass mode.
NOTE
Use the same UPS that was used to set internal bypass to return the parallel system to
Normal mode.
button
Press the
button to select the Go to Normal Mode option.
indicator illuminates, indicating the UPS system is
Each UPS goes to Normal mode.
Eaton 9355 Parallel UPS (10/15 kVA) User's Guide
button.
indicator extinguishes,
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164201601 Rev B
Eaton 9355 Parallel UPS (10/15 kVA) User's Guide 164201601—Rev E0
65
Operation
57
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