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Maintenance 39
5.2 Troubleshooting
Table 39
provides a list of the problems that may occur on the Helios DC System 4000/48, along
with their possible causes. Blown fuses and tripped circuit breakers should always be investi-
gated before utilizing
Table 39.
Table 39 Fault diagnosis
Fault symptom Possible causes
No DC output current
Open AC circuit breaker
Open DC circuit breaker
Faulty connection between the power shelf and the rectifier (Helios
Rectifier 100/48)
Faulty connection between the rectifier and the power plant
Sense leads opened
Incorrect indication of the DC
output current
Incorrect meter calibration
Loose shunt leads connection
Low float voltage
Faulty rectifier(s)
Shorted battery cell(s)
Prolonged power failure
Incorrect float voltage adjustment
Sense leads opened
Low recharge voltage
Incorrect float voltage adjustment
Discharge load greater than the rectifier’s capacity (batteries are
recharging or the system is in manual bypass)
Sense leads opened
High float or recharge voltage
Faulty rectifier(s)
Incorrect Float/Equalize adjustment
Failure to generate alarms
during alarm conditions
Incorrect connections between the controller and the rectifiers and
distribution panels
Failure to generate cabinet
alarm during minor or major
alarm conditions
Faulty LP fuse on the controller (F31)
Faulty cabinet alarm lamp
Faulty or loose connection
Failure to generate RFA alarm
under appropriate conditions
Faulty rectifier
Faulty wiring
Faulty RFA LED
Failure to generate FA alarm
Faulty wiring
Faulty fuse
Faulty FA LED
Loose connection
HV lamp lit
High discharge voltage condition
Incorrect HV level adjustment
LV lamp lit
Low discharge voltage condition
Incorrect LV level adjustment
HF lamp lit
High discharge voltage condition
Incorrect HF level adjustment
LF lamp lit
Low discharge voltage condition
Incorrect LF level adjustment
FA lamp lit
Blown fuse or extended FA alarm
CFA lamp lit
Blown charge fuse
DFA lamp lit
Blown distribution fuse
RECT MIN lamp lit
One rectifier has failed
RECT MAJ lamp lit
Two or more rectifiers have failed
RECT FAN lamp lit
Defective rectifier fan(s)