Maintenance bypass
Bypass input
Mains circuit
_,-
AC/ DC rectifier
input
DC/ DC boost
DC
I
AC inverter
Charger
Operation process for fault mode of bypass output
5.8 Maintenance bypass (manual operation)
-
.......
output
When UPS is faulty or needs on-site maintenance, qualified personnel will manually
switch the UPS to maintenance bypass mode. At this time mains power of bypass
input supplies power to the load directly, there is no electricity inside the UPS for
maintenance operation.
Note:
Make sure the system bypass is normal and not to start frequency conversion,
otherwise it may cause power failure or even damage to loads.
If the UPS has no output and needs manual operation on maintenance switch,
please ensure to disconnect all input breaker and the UPS display screen is
extinguished completely, then put the maintenance switch to "BYPASS" by hand,
otherwise it may cause damage to the UPS.
Refer to 4.6.4 for details.
5.9 Test mode
Test mode is specially used for test purpose, it is available to control UPS
step-startup and drive test etc. by back-end software.
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