TROUBLESHOOTING GUIDE
SYMPTOM
On switching on, the green LED does
not light. Buzzer is off. There is no AC
voltage
Low AC output voltage
(No buzzer alarm)
Buzzer alarm is sounded when load is
switched on. Voltage at DC input
terminals reads between 10 to 10.7 V for
PST-150S-12A or between 20 to 21.4 V
for PST-150S-24A.
Green LED is on.
AC output voltage is available
Buzzer alarm is sounded when load is
switched on. Voltage at the DC input
terminals reads below 10 to 10.7 V for
PST-150S-12A or between 20 to 21.4V
for PST-150S-24A.
Green LED is off.
There is no AC output
There is no AC output.
The green LED is off
Buzzer is on
POSSIBLE CAUSE
There is no voltage at the DC input
terminals
Polarity of the input voltage has been
reversed that has blown the internal DC
side fuses (
Note: Reverse polarity may
cause permanent damage)
Low input voltage at the inverter terminals
and the load is close to the maximum
allowable power
DC input voltage is less than 10.7 V for
PST-150S-12A or less than 21.4 V for
PST-150S-24A
Shut-down due to low input DC voltage
(Less than 10V for PST-150S-12A or less
than 20 V for PST-150S-24A).
Shut-down due to high input DC voltage
(> 16.5 V for PST-150S-12A or >33 V for
PST-150S-24A).
REMEDY
1. Check the continuity of the battery
input circuit.
2. Check that the battery fuse is intact.
Replace if blown
3. Check that all connections in the
battery input circuit are tight
Visibly check the fuse element if it is
blown. The fuses are soldered and are
not easily replaceable. Call Technical
Support for repair.
1. Check that the battery is fully
charged. Recharge, if low.
2. Check that the battery cables are
thick enough to carry the required
current over the required length. Use
thicker cables, if required.
3. Tighten connections of the battery
input circuit
4. Reduce the load
1. Check that the battery is fully
charged. Recharge, if low
2. Check that the battery cables are
thick enough to carry the required
current over the required length. Use
thicker cables, if required.
3. Tighten connections of the battery
input circuit
1. Check that the battery is fully
charged. Recharge, if low
2. Check that the battery cables are
thick enough to carry the required
current over the required length. Use
thicker cables, if required.
3. Tighten connections of the battery
input circuit
1. Check that the voltage at the DC
input terminals is less than 16.5V for
PST-150S-12A or less than 33 V for
PST-150S-24A.
2. Ensure that the maximum charging
voltage of the battery charger /
alternator / solar charge controller is
below 16.5V for PST-150S-12A or
below 33 V for PST-150S-24A
3. Ensure that an un-regulated solar
panel is not used to charge a battery.
Under cold ambient temperatures, the
output of the solar panel may exceed
18 V for 12 V system or 36 V for 24 V
system. Ensure that a charge controller
is used between the solar panel and the
battery
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