American Power Conversion 240-320kW 480V - Manual (Page 27)

Alarms and Events
990-4039
User Guide APC Silcon 240-320kW 480V UPS 27
5.4 Rectifying Alarm Messages
Following actions may rectify alarm:
• Check local utility supply. Fuses may be blown or supply switched off
accidentally
• Check if UPS cooling air intake is blocked
• Check if load exceeds maximum output capacity
• If, with power switched on, there is no UPS output voltage - and an attempt
to restart the UPS is in vain - use the external service bypass switch to
bypass UPS.
1. “Battery weak” message appears: Reset “battery weak” signal according to section 4.0
Parameter Settings and initiate battery capacity test according to section 6.3 Battery
Capacity Test. Make a record of obtained back-up time and use battery monitor to reset
alarm. Leave the UPS to recharge battery for at least 16 hours. Start up second battery test
without changing the load. If the test result shows improved back-up time, continue the test
series until no or just insignificant improvements are obtainable. If battery is still weak -
call for assistance.
2. “Battery Defective” message appears: Call for assistance. See section 8 “How to contact
APC”.
5.5 Parallel Operation Alarms
The parallel operation alarm message is: Communication to parallel IF lost
In the event of a parallel operation alarm, all parallel operation functions controlled by
Advanced Power Management will be inactive. In such situations only simple hardware control
such as load-sharing, operation mode etc. is possible.
Correction of false alarm situations during service:
When one system is isolated for service, the above alarm message will apppear if two systems
still operating. To delete this alarm message re-program the station addresses on all systems
in the following sequence:
1 to max_number_system
Alarms Description Action
46. Communication to parallel IF
lost
UPS fault Call for assistance
47. External shutdown accepted Remote signal for switching off
UPS accepted.
UPS switches off automatically –
48. Communication to VQ mains
lost
UPS fault Call for assistance
49. Bypass syncronization error The UPS cannot synchronize with
bypass utility Check if phase rotation of bypass
voltage is correct – if OK, call for
assistance
50. Battery charge error Transferred to battery operation
because of battery charge error Check RFI input fuse and
feedback relay