F3 Series Charger Manual
13
5
Trouble-
shooting
5.1
Troubleshooting Table
If there is a problem and you suspect the charger is at fault, turn off the AC mains supply before
proceeding. Ensure that the following are correct: AC input wiring, battery and/or load connections
and PC card connectors. Ensure no foreign objects are in charger.
Symptom
Possible Cause
Test
Corrective Action
No output /
Charge Fail
alarm
Control board
failure
Replace with known good
board
Replace board,
DC Fuse blown
Check fuse for continuity
Replace if open
High DC Shutdown
Check LED D30 on control
board
If lit, see "High output
Voltage" under Symptom
below in this chart
Power rectifier
circuit failure
Test all power diodes with
meter, perform SCR test on all
SCRs (figure 5.2)
Replace all shorted, open, or
bad parts
AC failure
Check input supply
Restore AC input supply
Shutdown due to
excessive output
voltage
Check whether LED D30 on
control board is lit
Shut off AC and DC breakers
for at least 2 minutes, then
restore
AC breaker
trips
repeatedly
Power diode, SCR,
or freewheeling
diode short
Check all power devices for
shorts
Replace shorted device(s)
DC fuse blows
or DC
breaker trips
Control board
failure
Replace with known good
board
Replace board, send bad
board to SENS for repair
Freewheeling diode
short
Check diode for short
Replace diode
Low output
voltage / Low
DC alarm
Control board
failure
Replace with known good
board
Replace board,
Misadjusted Float
Voltage pot (R34)
on control board
Adjust pot and see if output
voltage is affected
Adjust R34 to correct output
voltage
Overloaded charger
Turn off DC breaker, check
voltage on INSIDE breaker
terminals
Check load for problems, and
check battery condition
Overheating
Test all power diodes and
SCRs (figure 5.2)
Replace bad devices
Check for obstruction of top
and bottom vents
Remove obstruction(s)
Check for vertical mounting of
charger
Mount charger vertically
Verity that room temperature
is less than 50 C
Reduce room temperature
Verity that AC input voltage
is not higher than charger's
specified operating range
Contact utility company
Check for failure of one phase Contact electrician or utility
company
Bad filter capacitor Disconnect capacitors one at a
time and check for change in
output voltage
Replace capacitor that
corrected output voltage
when removed
