MR33 Series (75K-600K) Modular UPS
User Manual
6 Maintenance and Troubleshooting
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103
NO Abnormal phenomena
Possible reason
8
Buzzer long beeps, the
UPS turns to bypass
supply power.
See the fault information on touch screen.
9
There
is
mains,
but
buzzer
beeps
intermittently.
The mains voltage or frequency exceed the allowable range of
the UPS.
10
At mains status, the UPS
works normally, once
power outage, the UPS
works normally but load
system halt.
The grounding is not so good and the float voltage between
neutral wire and grounding wire is too large.
11
FAULT indicator of a
power unit is on.
The power module is fault, replace it in time.
6.4.2 Emergency Dispose for System Fault
How to deal with the system fault in emergency
When system fault, shut down the power supply of UPS by the touch screen, if necessary, close the
user load and disconnect the input and output switch of the UPS to avoid further damage for the UPS.
Inform the engineering technicist to maintain.
How to deal with the fault of single power module in emergency
When some power module fault, it will be insulated with system automatically. Generally, it will not
influence the system normal operation, but it will decrease the redundancy degree of the module. At
this time, please shut down the fault module and pull it out of the cabinet, and then inform the
engineering technicist to maintain.
After pulling out the module, there still has high voltage inside the module and on the rear connector
pin. It is necessary to wait enough time (
≥
10min) and then open the cover to maintain.
Summary of Contents for MR33 Series
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