Operating instructions

FC Operation & Maintenance Guide (20 & 25 Amp)

The FCA's alarm system includes a Form C contacts. The contacts change position whenever

the associated alarm is activated.

Adjustments

Customer service of the charger is recommended only if the technician is experienced in electrical

and electronic equipment. If a trained technician is not available, return the charger to the factory

for adjustment.

Instructions for charger adjustment are found on the following pages.

5.1 Adjusting the Charger Output Voltage

NOTE: There are two ways to adjust the charger voltage. The first method requires only an external

precision voltmeter. The second method takes less time, but requires a 40 volt, 100,000 micro farad

capacitor and an adjustable load.

NOTE: The charger can not be correctly adjusted without either a battery or the capacitor mentioned

above. SENS’ True Voltage Sensing circuit senses battery voltage only between charging current

pulses. The charger will provide its correct voltage only when a battery is connected.

All chargers (adjustment procedure where capacitor and & load bank are not available)

Use an external precision voltmeter connected to either the battery or the charger output terminals.

Make all adjustments in small increments to allow the battery voltage level to react to the new setting.

The adjustments must be made while the battery is connected to the charger, so some patience will be

required.

1. Open lower front panel to gain access to control circuit. The top cover hinges upward, the lower

cover hinges downward.

2. Remove protective paper dots from potentiometers labeled FLOAT and BOOST.

3. Turn boost voltage pot fully counter clockwise.

4. Adjust float pot in small increments until the battery reaches the desired voltage. The current output

should be in the range of 1 to 2 amps. As it takes the battery time to react to voltage changes, some

patience will be required.

5. Turn the boost pot fully clockwise (maximum output voltage).

Now adjust the boost charge voltage as described below:

Different adjustment procedures are used for AUTOBOOST and timed boost chargers.

AUTOBOOST chargers only (not equipped with a timer)