MY-A Series (10kVA-20kVA) UPS
User Manual
6 Use and Operation
91
Fault phenomenon
Possible reason
normal;
UPS over-temperature protection. Check if the air inlet and air
outlet of UPS is blocked or the working temperature of UPS is
beyond the allowable range.
Usually, UPS works normally.
When power failure, it doesn't
transfer to battery mode or it
transfers to battery mode and
battery under-voltage protection
soon.
Battery aging, the battery capacity loss. Please replace battery;
Battery charger fault. At ordinary time, the battery cannot be
charged;
Battery wire doesn't connect well or the terminals contact is
bad.
When the load is PC, everything
works normally. When power
failure, UPS works normally,
but the computer system halted.
The grounding connection is not so good. The floating voltage
between the neutral wire and the grounding wire is too high.
Table6-2
Meaning of fault symbol and buzzer status
NO.
Fault symbol
Buzzer status
Meaning
1
EPO
Long beep
UPS has emergency protection (if equipped with
EPO function), Bypass output and inverting output
are all closed.
2
Mode fault
Long beep
UPS system mode system settings and the actual
wiring do not match the fault, please check the
main power or bypass wiring, and make the actual
system is consistent with the set mode system.
3
Maintain bypass
fault
Long beep
UPS maintenance bypass protection, inverted
output closed, please checks back board
maintenance bypass detection port is shorted.
4
Output fault
Long beep
The UPS output is faulty, detect the UPS output is
short or over load.
5
Mode mismatch
Long beep
The UPS of the input and output mode in the
parallel does not match the actual system.
