BCM 1220 BATTERY CHARGER
PM004 Rev 2 00/09/21 Thomson Technlogy
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3.2. "EQUALIZE" VOLTAGE ADJUSTMENT
NOTE: Set "float" before proceeding with equalize adjustment.
3.2.1. Switch the charger to the "equalize" mode with switch.
3.2.2. Wait until the battery voltage stabilizes. (The output current should be almost
zero, unless a load is also connected to the battery. This may take many hours!)
3.2.3. If the voltage is incorrect, adjust equalize potentiometer located on the printed
circuit card. Turn the adjusting screw clockwise to increase voltage, and
counterclockwise to reduce voltage. Adjust in small increments, allowing voltage
to stabilize after each adjustment. When properly set, return the switch to "float".
3.3. "CURRENT LIMIT" ADJUSTMENT
NOTE: The "current limit" potentiometer is located on the printed circuit card. It is factory set at
100% of the nameplate rating. Do not exceed this setting or damage to the charger may
result.
During any testing or adjustment of the charger, observe the charging current. In the event that
the current exceeds the nameplate rating, current limit adjustment is required before further
operation.
3.3.1. It is necessary to connect the charger to a lower than nominal voltage load. This
may be accomplished by either:
- Cranking the engine, preferably with the engine disabled to prevent it
from cranking, or;
- Connecting the charger to a partial battery (if inter-cell jumpers are
exposed) or one of a lower voltage (eg. 12 volt battery for 24 volt
charger).
3.3.2. Observe the output current. If the current is within 10% of the nameplate rating,
adjustment is not required.
3.3.3. To adjust current limit, turn the potentiometer on the printed circuit board
(clockwise to decrease). Do not energize the AC supply, except momentarily,
until you are sure the current limit is not set too high.
4. DISCONNECTING THE BATTERY (e.g. For Engine Servicing)
Always turn off the AC supply before disconnecting the battery. This will prevent sparks, and will
ensure that electrical circuits are not fed by the charger alone, which could cause damage.
