CBC EA 900RT 10KVAH, User Manual

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TRUE ON LINE UPS

TRUE ON LINE UPS

APPENDIX

:    

Parallel operation (6KVA and 10KVA)

N+X is currently the most  reliable power supply structure. N  represents the minimum UPS
number that the total load  needs; X represents the redundant  UPS number, i.e. The fault UPS
 number that the system can  handle simultaneously. The bigger the X is, the higher reliability
of the power system is.  For occasions where reliability is  highly depended on, N+X is  the
optimal mode.
As long as the UPS  is equipped with parallel cables,  up to 3 UPSs can  be connected in parallel
to realize output power sharing  and power redundancy.

1. Brief introduction of the redundancy

      1) Users need to opt  a standard 25-pin communication cable,  which should have 25 cores,
correspondings stitches and shield, as  the UPS parallel cable. The length  of the parallel cable
is appropriate to be less  than 3m.
      2) Strictly follow the stand-alone wiring requirement to perform the input wiring of each UPS.
      3) Connect the output wires  of each UPS to an  output breaker panel, disconnect the  jumper
on JP1 and JP2 of  the terminal block first, and  connect each output breaker to  a main output
breaker and then to the  loads.
The requirement of the output  wiring is as follows:

2. Parallel installation

When the distance between the  UPS in parallel and the  breaker panel is less than  20 meters,
the difference between the wires of  input & output is required  to be less than 20%.
When the distance between the  UPS in parallel and the  breaker panel is greater than  20
meters, the difference between the wires  of input & output is required to be less than 10%.

       1) To perform the general operation, follow the  stand-alone operating requirement;
       2) Startup: The units transfer to  INV mode simultaneously as they start  up sequentially
in utility power mode;
Shutdown: the units shut down  sequentially in INV mode. When the  last one completes the
shutdown action, each unit will  shut down the inverter simultaneously  and transfer to bypass
mode.

3. Operation and maintenance

Load

Input  Switch Board

Output  Switch Board

Load

Load

Load