APC BC300 manual Alarms and Events

Alarms and Events

Table 5: Possible Alarms

	Low DC	The UPS has been running on	If the UPS is programmed for
	shutdown (This	battery power because of a power	auto-start, it will automatically
	alarm is normal	outage or problems in the AC input.	restart when the power outage
	when the UPS	Battery voltage has dropped below	ends and AC input is again
	has run on	the shutdown setting, and the UPS	available. If the UPS is not
	battery for a	has shut down. If bypass is within	programmed for auto-start, you
	long time)	tolerance, the unit will transfer to	can restart the UPS when the
		static bypass operation. If not, the	power outage ends by pressing
		unit will transfer to stand-by and	the green button inside the door.
		will not supply output voltage.
	Low DC	The UPS has been running on	If possible, restore AC input
	warning (This	battery power for a while because of	power to the UPS. If you cannot
	alarm is normal	a power outage or problems in the	do this, prepare for a possible Low
	when the UPS	AC input. Battery voltage has	DC shutdown by shutting down
	has run on	fallen to the warning alarm setting.	the loads (protected equipment)
	battery for a	If the APC BC300 Series is	connected to the UPS.
	while)	operating on battery, the unit’s
		status will not change, but battery
		voltage will eventually drop to the
		shutdown setting. At this point, the
		unit will shut down and sound a
		“Low DC shutdown” alarm. If the
		“Low DC warning” alarm occurs
		during a battery capacity test, the
		unit transfers back to normal
		operation.
		If the unit has not been running on
		battery power, call APC Technical
		Support.
	Mains freq. is	The utility (AC input) frequency is	Ask an electrician to make sure
	out of tolerance	out of tolerance. The unit transfers	that the correct input frequency is
		to battery operation. If utility	available to the UPS. The
		returns to a frequency within	electrician must correct any
		tolerance, the unit transfers back to	problems in input frequency. If
		normal operation. If not, the unit	input frequency is correct, call
		continues to run on battery until	APC Global Service.
		the “Low DC shutdown” alarm
		occurs. Then, if bypass is within
		tolerance, the unit transfers to
		bypass. If not, the unit transfers to
		stand-by and does not supply
		output voltage.
	Mains is	The utility (AC line voltage) was	If possible, restore AC input
	moment. out of	momentarily too high or too low.	power to the UPS. If AC input is
	tolerance (This	The unit transfers to battery; if	available to the UPS, ask an
	alarm occurs	utility returns to a frequency	electrician to make sure that 1)
	during a power	within tolerance, the unit transfers	the correct input voltage is
	outage)	back to normal operation.	available to the UPS. 2) this
			voltage is within an acceptable
			UPS range
			990-1403
User Guide APC BC300 Series 40kW 208/450/480V UPS			17