When ordering, please specify | Murphy BC701 Series instruction

R	M020101
The Generator Controls Division of	Issue 4, revised 07/98
	Catalogue section 75

BC700/701 series

AUTOMATIC BATTERY CHARGERS 3 AMP CONSTANT CURRENT

The Modex range of 3 Amp constant current chargers provide for the fully automatic monitoring and charging of standby diesel generator battery packs.

The advantages of this type of charger are primarily:–

∙Rapid recovery of battery charge, equivalent to a considerably higher rating ‘taper’ type charger.

∙Protection from overcharging. The unit switches off automatically once the batteries are fully charged.

∙Prolonged battery life, from the reduction of gassing and continual exercising of the cells.

When connected, the charger measures the battery terminal voltage. If this is below a pre-calibrated threshold, the unit outputs a series of charge pulses to the battery, regulating the average current to a constant 3 Amps.

Between charge pulses, the BC700 continues to monitor the battery terminal voltage. When the measured voltage has climbed to a suitable threshold the charger turns off, allowing the battery to decay back to the lower voltage threshold before the cycle is repeated. The ‘switch off’ and ‘switch on’ voltage thresholds are factory calibrated according to the type of battery used:–

	BC700 (12 V)			BC701 (24 V)
	Lead	Ni-Cd		Lead	Ni-Cd
Calibration:	Acid	9 cell	10 cell	Acid	18 cell	20 cell

Normal operation:
Switch on, VDC	12.6	12.3	13.8	25.4	24.7	27.6
Switch off, VDC	13.7	13.2	14.8	27.4	26.6	29.5

Boost operation:
Switch on, VDC	14.9	13.6	15.0	29.5	27.2	29.9
Switch off, VDC	15.7	14.5	15.9	31.5	28.9	31.9

Product Specifications

Power supply:	BC700	BC701
Nominal voltages	110 or 230 V AC (pin selectable)
Voltage ranges	95 – 135 V AC or 190 – 270 V AC
Frequency range	45 – 65 Hz.
Power consumption	< 80 VA	< 160 VA
DC charge output:
Charge current	3 Amps
Switch off threshold range	13.0 – 15.9 V DC	26.1 – 31.9 V DC
Switch on/off hysteresis	approx. 1 V DC	approx. 2 V DC
Charge fail output:
Type/rating	– ve DC (open collector transistor)
	max. 150 mA @ 33 V DC
General:
Weight	approx. 1.75 kg	approx. 2.55 kg
Ambient temperature range	–10 to	+55 oC
EMC emission/immunity	to EN50081-2/EN50082-2

Connection

The rate of the charge/decay cycle depends on the capacity and condition of the battery and the static load across it (the charger itself presents negligible load).

The ‘boost’ mode of operation may be selected by linking two terminals, either through a remote panel switch, relay or timer. This increases the switch on and switch off voltage thresholds, and may be used for short periods to increase the battery charge level.

The charge cycle state is indicated by two LEDs: amber for ‘on charge’ and green for ‘charge complete’.

	AC	230V
	AC	110V
	supply	110V
	supply	N
		N
		E

Charge + Fail

BC700/701

Boost –

RCF

charge

fail

battery

–

Two –ve DC (open collector transistor) outputs are provided for the remote signalling of ‘on charge’ and ‘charger fail’ conditions.

The BC700 series uses an open-chassis, metal cased design, suitable for bolt or stud mounting in an enclosed panel. Electrical connection is by ¼" blade terminals on the main PCB.