Separate A Ups Unit From The Rpa Parallel System (System Redundancy) - ABB MegaFlex UL S1 Series User Manual

72/86

7.3.2 Separate a UPS unit from the RPA Parallel System (System Redundancy)

Note!
If eBoost™ option is available, make sure that eBoost™ Operation Mode is disabled before starting
this procedure.
The Load is powered by the UPS Redundant RPA Parallel System.
One UPS unit of the RPA Parallel System has to be turned OFF, while the Load is shared between the
other units supplying the Parallel Bus.
The control bus cable connecting
the system has been powered ON.
Initial status:
Load supplied by all Inverters of the RPA Parallel
System.
1. Disconnect the Inverter performing the "Inverter OFF" command on the Unit to separate.
1 - Perform the "Inverter OFF" command from the screen:
Commands 1 / Inverter / OFF.
2 - Repeat the "Inverter OFF" command from the screen:
Commands 1 / Inverter / OFF.
With Redundant System, performing the "Inverter OFF" command the Inverter shuts down and it will stay OFF.
Performing the "Inverter OFF" command the Load is transferred to the Utility and the Inverter remains
operating, it means the system is not redundant.
In this case is not possible to switch-OFF one unit without transferring the Load on Mains.
• Load supplied by Inverter(s) of the other Unit(s) of the RPA Parallel System.
Synoptic diagram of the unit to separate
2. Open the "Q1 – External UPS Output Circuit Breaker" (Pos. O) on the Unit to separate.
•
LED ALARM is lit.
Synoptic diagram of the unit to separate
J1A - J2A and J1B - J2B
MegaFlex 1000 to 1600 UPS User Manual / REV-A
cannot be connected or disconnected after
Synoptic diagram of other units
Synoptic diagram of other units
Continue →