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6

5. Operating Instructions (cont.)

5.8.7.  Manual Equalization Start

3. The battery will be available when the green LED comes back on and the 
display shows AVAIL
4. The battery is now ready for use.  If the battery remains plugged in and refresh 
charge has been enabled, refreshes will occur to maintain an optimal charge. 
Push the ON/OFF button before unplugging the battery.

5.8.8.  Automatic Equalization Start

If an equalization day has been programmed in Charger configurations the 
equalization charge will start automatically on the programmed day of the week 
after charging is complete.  
NOTE: The factory default IEI Equalize, 6 hour Equalize, Sunday at 00 hour.
The battery will be available when the green LED comes back on and the display 
shows AVAIL.  The battery is now ready for use.  If the battery remains plugged in 
and refresh charge has been enabled, refreshes will occur to maintain an optimal 
charge. Push the ON/OFF button before unplugging the battery.

6. Fault codes

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.

6.1.  Fault Display

7. Service and Troubleshooting 

7.1.  Fault Display

7.1.  Fault Display (cont.)

Error

Cause

Solution

TH-Amb

Ambient temperature too 

high

Move the charger in a 

place with lower ambient 

temperature. Follow 

instrucitons 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 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.

MOD TH

Module thermal fault 

(check the air flow, 

ambient, refer to Module 

Status Description 

to check the internal 

temperature sensor)

Check that the fan(s) is 

(are) working correctly 

and/or that the ambient 

temperature is not too high 

or whether there is poor 

natural ventilation to the 

charger. 

If all modules are  

in thermal fault, a TH fault 

will follow.

MOD FUS

Module output fuse 

damaged

Call for Service

MOD Err

Module internal error 

Call for Service (check the 

Module status description)

MOD VBAT

Battery voltage is 

corrupted vs Fuse voltage 

and VLMFB vs Modules 

Call for Service (check the 

voltage reading on the 

Module Status Description)

TH-LOCK

Module is locked because 

of repetive thermal events

Check the Exx,CDV file  

to make action before  

to reset the locking or Call  

for Service

POWER  

MODULE OFF

No CANBUS 

communication between 

display and module

 Check ribbon cable, AC 

mains, Module plugged, 

idle = off or Call for Service

DF-VREG

Modules don't follow the 

regulation voltage setting 

Call for Service  

(replace the faulty module) 

DF-ID

Menu setting does no 

match the module type  

(ie: Cell setting = 12V, 

Module type 40 cells)

Use correct module.

CANBUSERROR

CAN bus error

Call for Service

DEFEEP

Memory access denied

Call for Service

DEFRTC

clock access denied

Call For Service

Error

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 

Too high or too low battery 

voltage. 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 profile has 

been achieved with a 

fault condition, that can 

be a current increase 

in regulation phase 

demonstrating a battery 

heating or a badly 

programmed regulation 

voltage, or the charging 

time is too long and has 

exceeded the safety limit. 

Check charging para meters: 

profile, temperature, 

capacity, cables. Check the 

battery (defective cells, high 

temperature, water level).

DF7

Air pressure pump fault. 

Current Di-Dt, thermal  

run away.  

Call for Service

TH

Charger Thermal  fault,   

all modules are on 

thermal fault (check 

air flow, 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.

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7.2.  Maintenance and service

7.2.1.  WARNING: THERE ARE  DANGEROUS VOLTAGES WITHIN THE 

BATTERY CHARGER CABINET. ONLY A QUALIFIED PERSON SHOULD 
ATTEMPT TO ADJUST OR SERVICE THIS BATTERY CHARGER.

7.2.2. 

The charger requires minimal maintenance. Connections and 
terminals should be kept clean and tight. The unit (especially the 
heatsink) should be periodically cleaned with a low pressure air to 
prevent any excessive dirt build up on components. Care should be 
taken not to bump or move any adjustments during cleaning. Make 
sure that both the AC lines and the battery are disconnected before 
cleaning. The frequency of this type of maintenance depends on the 
environment in which this unit is installed.

7.2.3. 

Any data, descriptions or specifications set forth herein are subject 
to change without notice. Before using the product(s), the user 
is advised and cautioned to make its own determination and 
assessment of the suitability of the product(s) for the specific use in 
question and is further advised against relying on the information 
contained herein as it may relate to any general use or indistinct 
application. It is the ultimate responsibility of the user to ensure that 
the product is suited, and the information is applicable to the user’s 
specific application. The product(s) featured herein will be used 
under conditions beyond the manufacturer’s control and therefore 
all warranties, either express or implied, concerning the fitness or 
suitability of such product(s) for any particular use or in any specific 
application, are disclaimed. The user expressly assumes all risk and 
liability, whether based in contract, tort or otherwise, in connection 
with the use of the information contained herein or the product itself.

© 2022 EnerSys. All rights reserved. Trademarks and logos are the property of EnerSys and its affiliates except UL

®

which is not the property of EnerSys. Subject to revisions without prior notice. E.&O.E.
EMEA-EN-OM-IMPAQ-1022

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