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CAUTION
Ensure correct polarity battery string series connection. i.e. inter-tier and inter-block connections
are from (+) to (-) terminals. Don't mix batteries with different capacities or different brands, or
even mix up new and old batteries.
WARNING
Ensure correct polarity of string-end connections to the Battery Circuit Breaker and from the
Battery Circuit Breaker to the UPS terminals i.e. (+) to (+) / (-) to (-) but disconnect one or more
battery cell links in each tier. Do not reconnect these links and do not close the battery circuit
breaker unless authorized by the commissioning engineer.
3.9 UPS Parallel Installation
The following sections introduce the installation procedures specified to the parallel system.
3.9.1
Cabinet installation
Connect all the UPS needed to be put into parallel system as below picture.
Make sure each UPS input switch is in 'OFF' position and there is no output from each UPS connected. Battery
groups are connected separately, change the setting to parallel mode through display or computer access.
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WARNING
Make sure the N, R (L1), Y (L2), B (L3) lines are correct and grounding
is well-connected.
CAUTION
Don't switch off the output breaker while UPS is in parallel operation. First disconnect
the UPS switch through display and then switch off the output.
3.9.2
Parallel Cable Installation
Shielded and double-insulated control cables available must be interconnected in a ring
configuration between UPS units as shown below. The ring configuration ensures high reliability
of the control.
3.9.3
Requirement for the parallel system
A group of paralleled UPS behaves as one large UPS system but with the advantage of presenting
higher reliability. In order to assure that all UPS are equally utilized and comply with relevant
wiring rules, please follow the requirements below:
•
All UPS must be of the same rating and connected to the same Bypass source
•
Output of all the UPS must be connected to a common output BUS
•
The length and specification of power cables, including the Bypass input cables and UPS
output cables should be the same. This facilitates load sharing when operating in Bypass mode.
Conclusion
•
It is economical to install power cable according to the full rating capacity initially with respect to
future requirements. The diameter of the cable shown below are that of a PVC cable.
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