Murphy Modex BC700 Series User Manual

Automatic battery chargers 3 amp constant current

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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

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’.
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.

When ordering, please specify:–

a) Product type: BC700 (12V) or BC701 (24V)
b) Battery type: lead acid, or number of Ni-Cd cells,

or special calibration requirements

Accessories:–
CVT502/506 Battery voltage trips, DIN rail mounted
CVT102/106 Battery voltage trips, 11 pin plug-in

The Generator Controls Division of

R

M020101

Issue 4, revised 07/98

Catalogue section 75

Dimensions (mm)

BC700 BC701

Connection

230V
110V

AC

supply

N

Boost switch/timer

E

Boost

charge

fail

Charge

Fail

BC700/701

+

+

RCF

battery

Product Specifications

Power supply:

BC700

BC701

Nominal voltages

Voltage ranges

110 or 230 V AC (pin selectable)

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

o

C

EMC emission/immunity

to EN50081-2/EN50082-2

Since 1939

Frank W. Murphy Manufacturer

PO Box 470248, Tulsa, Oklahoma 74147, USA

Tel: + 1 918 627 3550 Fax: + 1 918 664 6146

email: [email protected]

web: http://www.fwmurphy.com

Frank W. Murphy Southern Division

PO Box 1819, Rosenberg, Texas 77471, USA

Tel: + 1 281 342 0297 Fax: + 1 281 341 6006

email: [email protected]

Frank W. Murphy Ltd.

Incorporating Modex Automation

Church Road, Laverstock, Salisbury U.K.

Tel: + 44 1722 410055 Fax + 44 1722 410088

Pour service en Français, tél: + 44 1722 410697

email: [email protected]

web: http://www.fwmurphy.co.uk

Murphek Pty. Ltd.

1620 Hume Highway, Campbellfield, Vic. 3061 Australia

Tel: + 61 3 9358 5555 Fax: + 61 3 9358 5558

email: [email protected]

Murphy Switch of California

PO Box 900788, Palmdale, California 93590, USA

Tel: + 1 805 272 4700 Fax: + 1 805 947 7570

email: [email protected]

web: http://www.murphyswitch.com

Murphy de Mexico S.A. de C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje

San Luis Potosí, S.L.P. México 78384

Tel: + 52 48 206264 Fax: + 52 48 206336

email: [email protected]

Frank W. Murphy Pte, Ltd.

No. 2 Tuas South Street 2, Sprintecs Building

02-01/02, Singapore 637895

Tel: + 65 863 1398 Fax: + 65 863 0208

email: [email protected]

Frank W. Murphy Ltd. en France

Tel: +33 (1) 30 76 26 26 Fax: +33 (1) 30 76 39 89

Direct usine Tel: + 44 1722 410697

email: [email protected]

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