7.3.3 Reconnect a UPS unit to Redundant Parallel System
NOTE:
The Load is still powered by the other units supplying the parallel bus.
This UPS unit will be powered on and connected to the parallel bus in order to
share the Load with each other's.
The high speed bus cable connecting J1A - J2A and J1B - J2B in any case cannot be
connected or disconnected after the system has been powered on.
The bus terminals must be properly connected before powering the additional
unit.
If eBoost™ option is available, make sure that eBoost™ Operation Mode is disabled
before starting this procedure.
If IEMi option is available, make sure that IEMi Operation Mode is disabled before
starting this procedure.
Open the front door, of the Unit to reconnect, and make sure that:
• All the connections to the input/output terminals or bus bars of the UPS have been made correctly.
• The protection panels are fastened in their correct position.
• The switches Q1 and CB3 (option) are open (Pos. O) and the “External Battery Protections” must be
open (Pos. O).
1.
Switch-ON the Utility voltage, on the Unit to reconnect, from the input distribution (both
At this stage the Electronic Power Supply and Control Panel are switched ON and the Buzzer sounds.
Press “MUTE” key to reset Acoustical Alarm.
LED ALARM remains lit.
2. Close “Q1 - UPS Output switch” (Pos. I) on the Unit to reconnect.
•
Rectifier starts automatically.
LED 1 (Rectifier) blinking, indicates Soft-start.
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