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