02/02
66
Item
No.
DISPLAY ALARM MESSAGES Interpretation – Action
16. RECT.: SWITCH OPEN
RECT.: CURRENT LIMIT
BATTERY FUSE FAIL
DC BUS: FAST OVER VOL
Most of the rectifier fault messages are self explanatory, however, the DC bus :
OVERVOLTAGE message informs the operator the DC bus bar voltage is too high.
17. BYP: ABSENT
BYP: OVERVOLTAGE
BYP: UNDERVOLTAGE
BYP: FREQUENCY ERROR
INPUT FAILURE: Input AC supply failed or out of specified acceptable range. Do not
switch OFF the inverter where this indication is active or the load will lose its power.
18. BYP:SCR FAILURE One or more of the static switch SCR’s has developed a fault. The bypass would not
support the load in the event of UPS failure, immediate action is required. Seek qualified
assistance.
19. BYP. PHASE ROT. ERROR This message informs the operator that the input power lines have been cross-connected
and the phase sequence is incorrect.
20. CONTACTOR FAILURE The contactor has not closed on load at the correct time. Probably the load is on bypass.
If allowable, seek qualified assistance.
21. INV. PARALLEL ERROR This message has meaning only on paralleled 1+1 system: the parallel board has detected
a wrong sharing of the load and has blocked its inverter. Seek qualified assistance.
22. MANUAL BYPASS CLOSED This is a status warning that the load is being powered through the maintenance bypass
line and is unprotected from mains supply aberrations.
23. INV.: UNSYNCHRONIZED This warns that the inverter is not synchronized with the bypass supply, which is normally
due to a problem with the bypass supply being outside an acceptable frequency window.
Do not switch OFF the inverter when this alarm is active or the load will experience a
power break.
24. BATTERY: DISCHARGING This is a status warning that the battery is discharging. It normally accompanies a
[BYP:ABSENT] or [RECT.: SOFTWARE BLOCK] message.
25. AUTONOMY XXXX min The micro monitors the battery percentage capacity while on charge and the battery time
remaining while on discharge. It calculates the time remaining as function of the discharge
current against the programmed ampere-hour capacity of the battery. It will update the
time remaining as the load is changed.
26. BATTERY UNDER TEST This message informs the operator that the system is carrying out a periodic battery test.
27. BOOST TIME EXPIRED This message in only applicable to systems which include the boost charge option, boost
time charge elapsed set value, battery should be controlled by service personnel.
28. LOAD ON BYPASS This is a status that the load is being powered through the static bypass line and is
unprotected from mains supply aberrations.
This action is either selected by the operator or fault condition, check for other fault
messages.
29. RECT: SOFTWARE BLOCK
RECT.: OFF VIA DISPLAY
This is status message confirming that the inverter bypass has been selected off by the
operator from either the front panel display or an external PC or by a switch on UPS, uP
PCB.
30 BYP: HARDWARE BLOCK
BYP: OFF VIA DISPLAY
This is a status message confirming that the bypass has been selected off by the operator
from either an external PC or by a switch on UPS, µP PCB.
31. INV.: SOFTWARE BLOCK
INV.: OFF VIA DISPLAY
This is a status message confirming that the inverter has been selected off by the operator
either from the front panel display or an external PC or by a switch on UPS, µP PCB.
32. BYP.: TXR COUNT BLOCK This message informs the operator that the load has been transferred to the bypass more
than eight times in one minute. After eight transfers, the load will remain on bypass. This
message could be initiated by a load causing the UPS to overload. It requires
investigation.
In addition to the above messages there are a number of software alarms (i.e. BAD EEPROM, BACK-UP, BATTERY
LOW etc.) that will require attention from a qualified engineer.
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