KR series
（
6
-
10kVA
）
user
’s manual
- 34 -
5.4. Operation of Parallel system
5.4.1 Parallel System start up
Please keep load off before Parallel System starting up, and make sure all the
breakers are off.
Startup steps as following:
1. After confirming correct installation, start parallel units in turns as per UPS start
steps.
2. When each unit has input from inverter mode, test inverting voltages of each parallel unit- the
difference between Max. and Min voltage should not exceed 5V. At this time, close the breakers of
each parallel unit’s switching box and the circumfluence current should less than 3A.
If the voltage difference is bigger than 5V, check whether the voltage of each UPS unit is 220V; If
the voltage difference is bigger than 10V, report for maintenance. In addition, too big
circumfluence current will lead to inverter damage. If the circumfluence current is bigger than 3A,
report for maintenance.
3. Then close the output switching box’s main air breaker, each output branch air
breaker, then start the loads in turn.
5.4.2 Parallel System Shut down
System should not be turned On-Off frequently when it works normally.
1. Shut down all the output loads of the Parallel System firstly.
2. Shut down each UPS unit following the shutdown sequence by pressing the Off
key on panel in turn.
3. Turn off the output breaker on each UPS unit (It’s allowed to not shut down in
daily usage.)
5.4.3 Online shutdown Parallel System
When a parallel unit fails, this parallel unit will quit the parallel system
automatically with voice and light alarm. Now, just operate the process according
to chart 5.4-1 to make the failed unit completely quit from parallel system, and
realize online hot maintenance or replacement.
