Operating Instructions
3
01370E
indicating complete electrical circuits between
the electronic timer inside the charger to the
equipment battery pack as well as to live AC
power.
After the control relay pulls in with a click, the
transformer will hum, indicating that the
transformer has been energized by AC power.
After the transformer hums, the ammeter needle
will deflect, indicating initial charge rate.
3.
Monitor the ammeter for the initial charge rate.
The correct initial charge rate will vary due to
numerous factors. Refer to the chart to
determine the minimum and maximum initial
charge rate for the specific current rating
charger.
CORRECT INITIAL CHARGE RATE
Charger Current
Rating
Minimum
Start
Rating
Maximum
40
31
40
48
If the batteries are heavily discharged and the
AC input line voltage is higher than nominal, the
initial charge rate may exceed the maximum
initial charge rate for the specific current rating
charger. Under normal conditions, the charge
rate will decrease to or less than the specified
maximum charge rate in less than 120 minutes.
If the ammeter still reads in excess of the
specified maximum charge rate after 120
minutes, turn the charger off by depressing the
STOP button until the ammeter decreases to
zero or disconnecting the AC plug from its
receptacle.
CAUTION: TO PREVENT BATTERY
DAMAGE, CHARGER OVERHEATING AND
TRANSFORMER BURN OUT, DO NOT ALLOW
THE CHARGER TO OPERATE FOR MORE THAN
120 MINUTES WITH THE AMMETER READING IN
EXCESS OF THE SPECIFIED MAXIMUM CHARGE
RATE. THIS MISUSE WILL CAUSE OVER-
HEATING AND TRANSFORMER BURNOUT WILL
RESULT.
This high charge rate is caused if the charger is
connected to a battery pack with a system
voltage lower than, or Amp-Hour capacity
greater than, specified on the charger. If battery
maintenance has recently been performed, test
to see if an individual battery in the battery pack
has been connected reverse polarity. A
common error is to install one or more of the 6
volt batteries in a battery pack in reverse
polarity. Using a suitable DC voltmeter, test to
be sure all batteries in a battery pack are
correctly installed, and also test by measuring
the battery system voltage at the equipment
battery connector, and compare it to the system
voltage specified in the charger nameplate.
After charging for 120 minutes at this excessive
rate, the measured on-charge voltage should
rise to the voltage specified by the charger
nameplate. Voltage measurements, while
charging, lower than the charger system voltage
indicates an incorrect or failed battery pack that
must be corrected before using the charger.
If the batteries have been recently charged, the
battery is cold (temperature below 65
°
F), or the
AC input voltage is lower than nominal, the initial
charge rate may only reach the minimum initial
charge rate at turn-on for the specific current
rating charger.
If the initial charge rate is less than half of the
specified minimum initial charge rate at the
moment of turn-on, the charger may be
malfunctioning due to electrical overload
damage. Turn the charger off by depressing the
STOP button until the ammeter decreases to
zero or disconnecting the AC plug from its
receptacle.
CAUTION: DO NOT USE THE CHARGER IF
THE OUTPUT IS LOW. BATTERIES WILL NOT
REACH FULL CHARGE, THEREBY INCREASING
THE POSSIBILITY OF A HARMFUL DEEP
DISCHARGE DURING THEIR NEXT USE.
This too low a charge rate at the instant of turn-
on can be due to a battery pack system voltage
that is higher than specified on the charger, a
charger malfunction resulting from electrical
overload damage, or component failure. Test
for the correct battery pack system voltage with
a suitable voltmeter at the equipment battery
connector and compare with the system voltage
specified on the charger nameplate.
DANGER: TO REDUCE THE RISK OF
ELECTRIC SHOCK, ALWAYS DISCONNECT
BOTH THE POWER SUPPLY CORD AND THE
OUTPUT CORD BEFORE ATTEMPTING ANY
MAINTENANCE OR CLEANING.
The charger fuses are located behind the front
panel.
DO NOT REMOVE THE FRONT PANEL
FOR INSPECTION WITHOUT FIRST DISCON-
NECTING BOTH THE POWER SUPPLY CORD
AND THE OUTPUT CHARGING CORD. RISK
OF ELECTRIC SHOCK.
Visually inspect and electrically test the fuses. A
blown (OPEN) DC fuse indicates an electrical
overload damage caused short circuit failure of a
rectifier diode or reverse polarity connection of
the charger to the batteries. Melted fuses or
fuse links can result from weak fuseholders or
fuseholder connections.
