Features Of Rpa Parallel System; System Control; Synchronization; Load Sharing - GE TLE 160 User Manual

4.3.2 Features of RPA Parallel System

The TLE Series 160 - 500 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.
Modifications reserved
GE_UPS_USM_TLE_SUL_M16_M50_2bU_V010.docx
Critical Power
Page 18/91
User Manual TLE Series 160 - 500 UL S2B