Trouble Shooting
The Fault LED is solid on when a protection is triggered and output of the charger is off. When the cause of
the fault has been clear up, Fault LED becomes off and charger returns to normal operation. Almost all the
protections are by software design and self recoverable, once the cause of fault has been dealt with. There
are two layers of protection for Input and Output Over-Voltage, the first layer is by software and the second
layer by hardware as a double insurance to protect the charger and the connected devices.
Problem
Indication
Possible Causes
Suggested Solution
Recovery Condition
Low Voltage
Disconnect (LVD)
Ignition Control is not
set to Auto ON
Fault LED ON
12V battery system:
Input voltage <12.8V for
20s.
Check the starter
battery voltage.
Use correct size
cable between
charger and starter
battery.
12V battery system:
Automatic recovery
when input voltage
rises above 13.4V for
60s.
Fault LED ON
24V battery system:
Input voltage <25.6V for
20s
24V battery system:
Automatic recovery
when input voltage
rises above 26.8V for
60s.
Low Voltage
Disconnect
(LVD)
Ignition Control is set
to
Auto ON
Fault LED ON
12V battery system:
Input voltage <9V for 5s
Check the starter
battery voltage.
Use correct size
cable between
charger and starter
battery.
12V battery system:
Automatic recovery
when input voltage
rises above 11V for
5s.
Fault LED ON
24V battery system:
Input voltage <18V for 5s
24V battery system:
Automatic recovery
when input voltage
raise above 22V for
5s.
Output Over Voltage
Protection (Output
OVP)
Two layers of
protection
First layer by
software
Second layer by
hardware
Fault LED ON
Software OVP:
Output terminal voltage
>set absorption Voltage
+0.6V for 2s.
Disconnect any load
to battery and check
battery voltage.
If no load connected
to battery in first
place. Check battery
voltage if over set
absorption voltage,
disconnect battery.
Software OVP:
Automatic recovery
when the voltage on
output terminal is
reduced below
absorption Voltage
+0.3V for 3s.
Fault LED ON
Hardware OVP:
Output terminal voltage
>
34.0
V.
FUSE will blow.
Hardware OVP:
Does not automatic
recovery
Required to replace
the blown FUSE.
Input Over Voltage
Protection (Input
OVP)
Two layers of
protection
First layer by
software
Second layer by
hardware
Fault LED ON
PV LED may
also be on at
the same time.
Software input OVP:
Charger output will be
shutdown when input DC
voltage higher than 32V.
Check input battery
voltage is not higher
than 32V.
Software Input OVP:
Automatic recovery
when the voltage on
input terminal is
reduced below 31.5V
for 5s.
Input Over Voltage
Protection (Input
OVP) by hardware.
All LEDs OFF
including the
FAULT LED.
Hardware Input OVP:
The FUSE will blow when
input terminal voltage
higher than 33.5V.
Find out about the
Input source
condition & spec
such as voltage
surge etc.
Before replacing with
the new fuse.
Hardware input OVP:
Does not automatic
recovery
Required to replace
the blown
FUSE.
Over Temperature
Protection (OTP)
Fault LED ON
Charger internal
temperature is too high.
Check input &
exhaust ends have
no blockage and
a minimum 10mm
clearance.
Automatic recovery
when charger
temperature reduce to
normal level.
FAN fault
Fault LED ON
FAN not working
Check for objects
jamming fan or Fan
is out of order.
Remove objects which
jamming
the fan .
P.12
REV.0 20200311
7673-5936-0560
