23
KEOR S 3-10 kVA
Oper
ating & I
nstalla
tion M
anual
UPS can only be paralleled with the same model/capacity units.
In case of N+1 configuration, Maintenance Bypass Circuit Breaker (Q4) cannot be used.
In case of 1+1 configuration, Maintenance Bypass Circuit Breaker (Q4) can be used.
5.4.
Installation Procedures and Instructions for Parallel Systems (for 6-10kVA)
5.4.1.
Important Safety Instructions
•
Maximum of 4 identical power Keor S unit can be connected in parallel.
• Make sure those UPS in parallel are with the same ratings and types. For instance, the UPS without galvanic
transformer cannot be in parallel with the UPS with galvanic transformer.
• The protection devices must be chosen properly as defined in Table.3 considering total parallel UPS power.
• The parallel function of the UPS can only be enabled in Normal Mode.
• Before any parallel coupling is proceeded, make sure the difference of the inverter voltage of each UPS in
parallel at NO load should be less than 1VAC. Please consult to authorized dealer if the voltage difference is
over 1VAC.
• Make sure the RJ45 communicating wire is connected tightly during parallel mode; otherwise, it might
cause outage or damage of both the UPSs and the output device.
• Only two terminal resistors on the rear panel of the two (2) or four (4) of the UPS in parallel shall be set at
“ON” position and the rest of them should be set at “OFF” position; otherwise, the parallel operation of those
UPS might be abnormal or damaged.
5.4.2.
Parallel System Accessories and Installation Position
1. Accessories:
• 1 set of RJ-45 communication wire for parallel system (C1, C2)
• 1 set of Metal bracket (F1)
• 1 set of cable ties (T1 or T2 and T3)
Parallel System Accessories
Figure.5.4.2-1
