EnerSys NexSys+ TC3 IQ - Service and Troubleshooting

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SERVICE & TROUBLESHOOTING
Service and Troubleshooting
Fault Display
In case of a fault, one of the corresponding fault codes
listed below will appear on the display. If it is a critical
fault, charging will stop and the red Fault LED will be
illuminated.
Fault Codes
Fault Cause Solution
DF-CUR
Current fault before DF1 (can be low mains, phase
missing or faulty module).
Call for service.
DF1
Critical current fault, all modules are on DF1 fault
(check the mains and phase missing).
Call for service.
DF2 Output fuse fault, battery reverse polarity.
Check the correct connection of the battery (reversed polarity
cables) and the output fuse.
DF3 Incorrect battery voltage for charger setting.
Battery voltage too high or too low. Battery voltage must be
between 1.6V and 2.4V per cell for lead-acid technology. Use
proper charger for battery.
DF4 Overdischarge. Charge continues.
DF5
Battery or charger setting inspection (Ah security,
charge timeout, negative voltage Dv/Dt).
DF5 appears when the charging prole has been achieved
with a fault condition. That can be an increase in current
during the regulation phase indicating battery heating or a
badly programmed regulation voltage, or the charging time
is too long and has exceeded the safety limit. Check charging
parameters: prole, temperature, capacity, cables. Check the
battery: defective cells, high temperature, water level.
DF7
Air pressure pump fault. Current Di-Dt,
thermal runaway.
Call for service.
TH
Charger thermal fault, all modules are on thermal
fault (check air ow and ambient temperature).
Verify the proper operation of the fans and/or absence of too
high ambient temperature, or there is poor natural ventilation
to the charger.
TH-Amb Ambient temperature too high.
Move the charger to a place with lower ambient temperature.
Follow instructions on installation and safety.
DFMOD
Module faulty (refer to Module Menu to know the
fault type).
Call for service.
MOD DEF Module is unplugged or does not answer.
Clean the module or the backplane connection. If not working,
call for service.
MOD DFC
Module converter faulty; the module can’t output
the maximum current (check the AC phases and
AC fuse).
Check power supply.