c)
Install the new parallel system refers to the previous section.
9)
Remove one unit from the parallel system
There are two methods to remove one unit from the parallel system:
First method:
a)
Press the “OFF” key twice and each time should be lasted for more than 0.5s, then the UPS will enter
into bypass mode or no output mode without output.
b)
Turn off the output breaker of this unit, and then turn off the input breaker of this unit.
c)
After it shutdown, you can move the parallel cable and share current cable. And then remove the unit
out of the parallel system.
Second method:
a)
If the bypass is abnormal, you can not remove the UPS without interruption. You must cut off the load
and shut down the system first.
b)
Make sure the bypass setting is enabled in each UPS and then turn off the running system. All UPS will
transfer to bypass mode.
c)
Remove all the maintenance bypass covers and set the maintenance switches from “UPS” to “BPS”.
d)
Turn off all the input breakers and battery breakers in parallel system.
e)
Turn off the output breaker and move the parallel cable and share current cable of the UPS which you
want, then remove it out of the parallel system.
f)
Turn on the input breaker of the remaining UPS and the system will transfer to Bypass mode.
Set the
maintenance switches from “BPS” to “UPS and put the maintenance bypass covers back.
g)
Turn on the remaining UPS according to 5).
Version
Date
Modification
1.0
20120810
New create
1.1
20140805
Some words correction
2.0
20140902
For UPS with isolation output transformer, need to join the neutral at
the
input terminal
of each UPS together.
Because the input breaker of
the UPS never cut OFF the neutral.
3.0
20150324
Add 30K to the SOP and some small issue corrected.
4.0
20160130
Modify the control boards necessary for parallel description
