Operating instructions

FC Operation & Maintenance Guide (20 & 25 Amp)

• Remove jewelry, watches, rings, etc. before installing battery or charger.

READ THIS

FIRST

CAUTION: Failure to follow installation instructions may cause equipment

damage, or void the equipment warranty. READ THESE INSTRUCTIONS

BEFORE PROCEEDING!

• The charger must be connected to a battery for it to operate properly (see Section 4.1). If

the charger is feeding a load and charging a battery, disconnecting the battery will cause the

output voltage to rise to unsafe levels with possible damage to connected loads. Always

disconnect the AC mains power before disconnecting the battery from the charger. If

the charger is not connected to a battery it will operate at approximately half its rated

voltage, and the alarm relays (if the unit is so equipped) will chatter.

• Do not connect the battery leads to the charger backwards. Doing so will blow the output

fuse when the charger is energized

• Changing factory-set potentiometers voids the warranty. Contact the factory if the settings

on your charger are incorrect.

Before determining that the charger is not working correctly, check the following:

1. Is AC power available to the charger?

2. Are any fuses blown?

3. Is the charger connected to a battery of the correct voltage?

4. Was the charger damaged in transit or installation?

5. If you determine that the charger is not working because it is not putting out any current,

check the battery’s state of charge. If the battery is fully charged it is perfectly normal for

the charger to indicate zero current flow. See Figure 4.1.

6. If the battery is being over-

or undercharged, check whether the output voltage settings have

been tampered with. The pots should be covered with either white adhesive paper dots or

a hard red varnish.

Overview

This manual covers installation, operation and troubleshooting of 20 & 25 amp SENS battery

chargers type FC and FCA. Complete parts lists and board-level documentation is not

included; these are available separately from SENS.

Please follow the installation and use instructions. They are vital to the satisfactory operation of

the charger. Service information is provided for the benefit of customers experienced in the

service of powe

r conversion equipment. If there are any doubts about adjusting, maintaining or

servicing the equipment, return the charger to the factory for adjustment/repair.