50 1600XPi Series UPS Installation and Operation Manual – 60616-014
19.3 (Optional) External Three-Breaker Maintenance Bypass (No Transformer)
The Three-Breaker MBS solution will allow the user to transfer the load between utility and inverter power sources without
interruption. It also allows the UPS itself to be isolated from utility power for safe maintenance or replacement of the unit.
When using an MBS, the utility and inverter waveforms must be identical so ONLY 240V input and output operation is
available for the 1600XPi in this conguration.
240V Wiring
The following connections must be made to the Utility Panel and the Load Panel. The Main UPS output is located on the
terminal block on the back of the UPS. (TB-4(X1) and TB-7(X3) 240 VAC.) Ensure the UPS voltage selector jumper is set
to 240 V.
MAIN OUTPUT
UTILITY PANEL:
SINGLE Φ
240V
L1
L2
N
G
LOAD
PANEL
L1
L2
N
G
L1
L2
G
X1
X3
N
G
MIB1
MIB2
MBB1
MBB2
L1
L2
UIB1 UIB3
UIB2 UIB4
G
N
See the application instructions included with the External Maintenance Bypass Unit for wiring details.
NOTICE
Do NOT use two legs of a three phase, 208/120V utility to feed the 1600XPi, as shown
below, if this external maintenance bypass is being used. The output of the UPS and
the utility feed have dierent phase to neutral references and transfer between the two
could cause loss of power or damage to the load.
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