Critical Power
Modifications reserved
Page 16/91
GE_UPS_USM_TLE_SUL_M16_M50_2bU_V010.docx
User Manual
TLE Series 160 - 500 UL S2B
4.2.5
Automatic Bypass
In normal operation, the
Load
is supplied by
the
Inverter
.
When the control system detects a fault in
the
Inverter
, an overload condition or a short-
circuit condition, the
Automatic Bypass
will
transfer the critical
Load
to the
Utility
without
interruption.
When the
Inverter
recovers, or the overload
or short-circuit condition is corrected, the
Load
will be automatically transferred back to
the
Inverter
.
Fig. 4.2.5-1 Block diagram Automatic Bypass
If the UPS is unable to return to normal mode following an automatic transfer to
Bypass mode
, an
alarm condition will be initiated.
In case of RPA Parallel System
Each unit has its own internal Bypass.
These units are continuously exchanging information, enabling all of the internal Bypass circuits in a
Parallel System to operate simultaneously.
If the Inverter of a unit fails, its Bypass circuit remains available to the Parallel System.
It is excluded only if the unit is separated from the common bus by opening its output switch
Q1
.
