NiMH Battery Charger
NiMH Battery Charger
DESCRIPTION:
General
Battery
Charging Plug-Pack
Minimum Power Supply
Typical Charge Time
Battery Life
NiMH Battery Charger
10 cell (12V nominal), ≤2800mAh
Input: 100 to 240VAC 50/60Hz 0.8A
Output: 24VDC 1.25A
22VDC to 28VDC min. 18W
<4 hours
>300 discharge-charge cycles typical
OPERATION:
The NiMH battery charger is designed to allow safe, fast charging of a NiMH battery pack while
also supplying power to the connected indicator. Operation is fully automatic, requiring only the
connection of a plug-pack power supply to initiate charging. Charging should normally take less
than 4 hours to complete.
While the plug-pack supply is disconnected and sufficient battery charge remains, the charger
will automatically supply the output from battery power. To protect the battery pack, the charger
will automatically disconnect the output when the battery is below a safe level.
The battery charger supports a dual colour (Red/Green) LED annunciator to show status.
Status Annunciator
OFF
Input Power Output Power Charging
Not present Battery 1
No
Meaning
Battery operation
GREEN
Present
Input
No
Ready
RED
Present
Input
Yes
Input
2
FLASHING GREEN
Present
No
Charging
Fault 3
Notes:
1. If battery is sufficiently charged.
2. It is necessary to remove then reconnect the input power before further charging will occur.
3. Refer to troubleshooting section for further information.
While charging is occurring it is normal for the battery to get hot. The battery temperature is
monitored and charging may be suspended if the temperature becomes excessive. This is
most likely to occur when the ambient temperature is high. This will result in an extended
charging period. The status annunciator will remain RED during suspended charging.
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TROUBLESHOOTING:
Problem
Flashing green Status
Annunciator 1
(within a few seconds of plugpack connection)
Flashing green Status
Annunciator 4
(following a charge cycle)
Battery gets hot
Insufficient battery life
With plug-pack connected,
Status Annunciator never
lights
Possible solutions
• Wait for up to 30min: The battery may be excessively
discharged and will take some time to recover.
• Check Input Voltage: The charger requires a minimum 22V.
• Check Battery Connections: The battery connections may be
faulty.
• Replace Battery: The battery may have failed.
• The battery may have failed to reach 100% charge, however
the battery should be sufficiently charged to operate normally.
To start a further charge cycle, simply disconnect the plugpack supply for a few seconds and reconnect. If at this point
the annunciator shows solid green, no further charging is
required.
• It is normal for battery to get quite hot (80°C (176°F)) during
charging.
• Reduce System Power Requirements: Turn off or reduce
backlight brightness; enable auto power-off (if supported).
• Replace Battery: A battery will typically last at least 300
discharge-charge cycles.
• Check Wiring Polarity: The input supply polarity may be
reversed. Ensure plug-pack polarity is correct, and all
intermediate connections maintain polarity.
• Check Input Voltage: The charger requires a minimum 22V
Notes:
4. To clear this state, it is necessary to disconnect the plug-pack supply for a few seconds and
reconnect.
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CONNECTIONS:
WARNING
• The battery and the supply plug-pack must be isolated (disconnected)
before installing or removing this device.
• Output connection must be completed before Input or Battery connections
are made.
Output connection “Out”
Connect attached wires to indicator
power input.
Red (‘+’) to Indicator positive.
Black (‘-‘) to Indicator negative.
Status Annunciator
Pre-connected LED or
2 way connector.
Input connection “In”
2 way screw terminal block.
Positive supply to ‘+’ terminal.
Negative supply to ‘-‘ terminal.
Battery connection
4 way connector.
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