APC 60-80KW 208/480V UPS manual Rectifying Alarm Messages

		Alarms and Events
40.	RAM1 memory write error	UPS fault	Call for assistance
41.	Memory write error	UPS fault	Call for assistance
42. Communication to VQ bypass		UPS fault	Call for assistance
	lost
43. Communication to VQ output		UPS fault	Call for assistance
	lost
44.	Communication to DMU lost	UPS fault	Call for assistance
45.	Communication to controller	UPS fault.	Call for assistance
	lost	Display will show invalid UPS
		data
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 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 utility 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”.

990-4035

User Guide APC Silcon 60-80kW 208V/480V UPS 27