APC BC300 manual Operation Modes, Operating Modes, Sample Display Operation Mode Description

Operation

3.1Operation Modes

The display automatically indicates which mode the unit is operating in. See Table 1 below for sample display messages and an explanation of each.

	Table 1: Operating Modes
Sample Display	Operation Mode Description
Mode
Normal Operation	The UPS is in the normal operation mode. During normal operation,
load power ##%	utility (AC line) passes through the UPS and to the load. The inverter
	regulates the output and charges the batteries. The UPS measures
	all three phases, and the display reads out the% load of the highest
	loaded phase.
Battery Operation	When AC input is out of tolerance (outside programmed limits), the
time ## minutes	UPS is running in battery mode. The main static switch is open, and
	the inverter is powered from the batteries. The power is then fed to
	the loads. If the batteries are depleted, the unit will switch to stand-
	by mode (see below) and wait for utility to return in tolerance. If auto-
	start is programmed to “ON,” the unit will automatically start about
	30 seconds after utility has returned. If auto-start is programmed to
	“OFF,” you must start the unit manually by pressing the green
	button inside the front door. (See the “Parameter Settings” section in
	this User Guide.)
Bypass Operation	The AC input passes unregulated through the bypass static switch,
	through the main transformer, and to the loads. The UPS’ inverter is
	in stand-by and is synchronized to the utility, ready to transfer the
	unit to battery operation if utility voltage is out of tolerance.
Economy Mode	The unit has been programmed to operate in economy mode. The AC
	power flows in bypass, and the UPS will periodically transfer to
	normal operation to charge the batteries (at 7-day intervals by UPS
	default). The inverter is in stand-by and is synchronized to utility,
	ready to transfer to battery operation if utility voltage is out of
	tolerance. The output voltage is not regulated in this mode, but
	efficiency increases. Call APC Technical Support or your nearest
	APC office for more information on programming your APC BC300
	Series UPS for Economy Mode.
** Stand-by **	Both static switches are open. The unit is not supplying output
	voltage.

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User Guide APC BC300 Series 40kW 208/450/480V UPS	7