29
immediately to avoid possible damage to the UPS or equipment.
12. Operation in maintenance bypass mode
This operation is only available for professional or qualified technicians.
When the UPS needs repair or service and then the load can
’
t be shut off, the UPS needs to turn to
maintenance mode.
1) First, turn off the UPS (Bypass enabled -Active setting must be checked before turning off UPS!)
2) Second, remove the cover of maintenance bypass switch on the panel.
3) Third, t
urn the maintenance switch to “B
PS
” position
and turn off the UPS input breaker and output
breaker.
3-5. Parallel Operation
1. Parallel system initial startup
Please make sure that all of the running UPSs are parallel models and have the same configuration.
1)
Turn on each UPS in AC mode respectively (Refer to section 3-4(1)). Then, measure the inverter
output voltage of each phase for each UPS with a multi-meter. Calibrate the inverter output voltage
by configuring inverter voltage adjustment (Refer to SETTING
➔
VOL CALI screen) in LCD menu
until the inverter output voltage difference of each UPS is within 1V or less.
2) Turn off each UPS (Refer to section 3-4(7.)). Then, follow the wiring procedure in section 2-4.
3) Remove the cover of parallel share current cable port on the UPS, connect each UPS one by one
with the parallel cable and share current cable, and then screw the cover back.
4)
Turn on the parallel system in AC mode:
a)
Turn on the line input and bypass breaker of each UPS. After all UPSs enter to bypass mode,
measure the output phase to phase voltage between all units to make sure the phase
sequence is correct. If voltage differences are near to zero, that means all connections are
met. Otherwise, please check if the wirings are connected correctly.
b)
Turn on the output breaker of each UPS.
c)
Turn on each UPS in turns. After a while, the UPSs will enter to AC mode synchronously and
then, the parallel system initialisation process is complete.
5)
Turn on the parallel system in Battery mode:
a)
Turn on the battery breaker and output breaker of each UPS.
b)
Turn on any UPS. A few seconds later, the UPS will enter to battery mode.
c)
Turn on another UPS. A few seconds later, the UPSs enter to Battery mode and add to the
parallel system.
d)
If you have the third UPS, follow the same procedure of c). Then, the parallel system is
complete.
If you would like to have more information regarding to the parallel operation, please contact
your supplier or service center for detail parallel operation instruction.
2. Add new units into the parallel system
1) You cannot add a new unit into the parallel system when the whole system is running. You must
cut off the load and shutdown the system or transfer load to external bypass mode if available.
2) Make sure all of the UPS are parallel models, and follow the wiring refer to section 2-4.
3) Install the new parallel system refers to the previous section.
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