Critical Power
Modifications reserved
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GE_UPS_USM_TLE_SUL_M62_1M0_2US_V010.docx
User Manual
TLE Series 625 - 750 - 1000 UL S2
4.3.2
Features of RPA Parallel System
The
TLE Series 625 - 750 - 1000 Parallel System
is designed to provide a complete
Redundant Parallel
Architecture
, and is free from common equipment.
Not only the
Inverters
but also the
Bypass
functions are redundant.
When one UPS needs maintenance or service, the
Load
is powered by the other units.
The redundant communication bus to which all units are connected keeps each unit informed about the
status of all the other units.
The
control panel
located on each unit allows controlling and monitoring the status of this unit.
4.3.3
System control
A
high-speed redundant, serial communication bus
, guarantees the exchange of data and thus the
communication between the CPU's of each unit.
Each module controls is own function and operational status and communicates with all other modules,
in order to act or react if necessary, adapting to the new conditions.
4.3.4
Synchronization
All units are identical, but one unit is arbitrarily selected as the reference and all the other units
synchronize to this unit, which in turn synchronizes to the
Utility Bypass
voltage, as long as the latter is
within tolerances.
In case of reference failure, another unit in the
Parallel System
is automatically chosen to take over the
reference role.
The
Bypass Input
for all the units of the
Parallel System
must be supplied from the same AC source (no
phase shift allowed between them).
4.3.5
Load sharing
On each unit of the
Parallel System
,
Inverter Output Voltage
and
Current
are measured and applied to a
Load
sharing bus.
An eventual difference between the units is therefore automatically equalized.
NOTE !
It is strongly recommended that no transformers, automatic circuit breakers or
fuses should be installed between the units output and the Load common bus bars.
However, it is recommended that a disconnection or isolation switch is installed in
order to totally isolate a unit if needed.
