APC 480kW 400V manual Rectifying Alarm Messages, Parallel Operation Alarms

Alarms and Events

	Alarms	Description	Action
46.	Communication to parallel IF	UPS fault	Call for assistance
	lost
47.	External shutdown accepted	Remote signal for switching off	–
		UPS accepted.
		UPS switches off automatically
48.	Communication to VQ mains	UPS fault	Call for assistance
	lost
49.	Bypass syncronization error	The UPS cannot synchronize with	Check if phase rotation of bypass
		bypass mains	voltage is correct – if OK, call for
			assistance
50.	Battery charge error	Transferred to battery operation	Check RFI input fuse and
		because of battery charge error	feedback relay

5.4Rectifying Alarm Messages

Following actions may rectify alarm:

•Check local mains 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 mains 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 8.0 “How to contact APC”.

5.5Parallel 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

990-4041

28 User Guide APC Silcon 480kW 400V UPS