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26 User Guide APC Silcon 240-320kW 400V UPS
990-4057
Alarms and Events
Alarms Description Action
23. Main inverter failure Temperature of main inverter, too
high or inverter fuse blown
Check fan, check for airflow
obstructions, check for overload,
check fuse
24. High temperature of delta
inverter
Temperature of delta inverter, too
high
Check fan, check for airflow
obstructions, check for overload
25. Low DC shutdown Battery discharged to minimum
permissible level
Ensure battery recharging
26. Low DC warning Battery nearly discharged Save your data now
27. Mains momentarily outside
tolerance
Short disturbances on mains
supply (1 ms transients)
–
28. Mains outside tolerance Mains input voltage R.M.S. value
outside tolerance
–
29. Mains frequency outside
tolerance
Mains input frequency outside
tolerance
–
30. Bypass momentarily outside
tolerance
Short disturbances on bypass
voltage
–
31. Bypass outside tolerance Bypass input voltage outside
tolerance
–
32. Bypass frequency outside
tolerance
Bypass input frequency outside
tolerance
–
33. Output momentarily outside
tolerance
Short disturbance on output
voltage (inrush current)
If message reappears -
call for assistance
34. Output outside tolerance Output voltage outside tolerance Call for assistance
35. Output frequency outside
tolerance
Output frequency outside
tolerance
Call for assistance
36. High battery temperature Battery ambient temperature too
high
Check system ambient
temperature, check fan, check for
airflow obstructions
37. Battery weak Battery capacity below 75% or
battery MCCB/fuse switched off
Test battery capacity
38. Battery defective Insufficient battery capacity or
battery MCCB/fuse switched off
Call for assistance
39. System locked in operation
mode
UPS has made 10 attempts within
1 minute to switch from bypass to
battery operation, or “High DC
warning” has appeared 10-20
times within 1 minute
Unlock.
If message reappears -
call for assistance
40. RAM1 memory write error UPS fault Call for assistance
41. Memory write error UPS fault Call for assistance
42. Communication to VQ bypass
lost
UPS fault Call for assistance
43. Communication to VQ output
lost
UPS fault Call for assistance
44. Communication to DMU lost UPS fault Call for assistance
45. Communication to controller
lost
UPS fault.
Display will show invalid UPS data
Call for assistance