Murphy BCEG-24-20 - Manual (Page 12)

Section 75 00-02-0615
02-29-08 - 8 -
The BCEG-12-10 and BCEG-24-10 models are fitted with a self-resetting polyfuse on the DC
output. If reverse polarity or short circuit faults occur, turn off AC power and disconnect the
outputs. This will allow the polyfuse to reset. The charger can then be re-connected and
switched back on. No replacement of output fuse should be necessary. If fuse fails to reset,
the charger should be returned to supplier. BCEG-24-20 models are fitted with an automotive
type blade fuse. Ensure correct rating when replacing fuses.
Automatic Battery Charger
The Guardian is an automatic battery charger. If battery voltage falls below a preset voltage
(12.2V on a 12V lead-acid battery) the charger will automatically enter an increased charging
voltage state (boost). Once the batteries have reached a charged state, the charger will switch
to it’s normal “float” voltage. This prevents over-charge, which in turn prevents the battery
from over-gassing and subsequently maximizes battery life.
Connection to Power Supply
Ensure supply is off before connection is made to charging unit. Ensure unit is properly
grounded to the charger’s metal chassis.
CAUTION: Ensure correct AC voltage is supplied to unit. Applying 240VAC on
a 120VAC unit will destroy it and could cause serious personal injury.
Connection to Batteries
Ensure power supply is off before connecting charger to batteries. Ensure battery type and
voltage are correct before connecting to batteries.
WARNING: Charging either different voltage or type of batteries from stated
type may result in damage to both the charging unit and/or batteries and could
result in serious personal injury.
Disconnection of Batteries
Ensure power supply is off before disconnecting charger from batteries.
WARNING: Disconnecting the batteries while power supply is connected to the
charger could result in a spark at battery terminals, which could ignite the
hydrogen given off from the batteries.
Boost Initiate Connection
The charger will be in it’s normal mode of operation while the boost link is broken. Upon
connecting the two boost initiate terminals the charger will perform a single auto-boost cycle.
While the charger outputs a higher voltage, once the battery voltage has reached this point,
the charger returns to it’s normal float mode of operation.