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No load draw (idle current)
When the on / off switch is turned on, all the circuitry inside the inverter becomes alive
and the AC output is made available. In this condition, even when no load is being
supplied (or, if a load is connected but has been switched off), the inverter draws a small
amount of current from the batteries to keep the circuitry alive and ready to deliver the
required power on demand. This is called the idle current or the no load draw. Hence,
when the load is not required to be operated, turn off the on / off switch on the inverter to
prevent unnecessary current drain from the battery.
PROTECTIONS AGAINST ABNORMAL
CONDITIONS
The inverter has been provided with protections detailed below.
Low DC input voltage warning alarm. The voltage at the DC input terminals will be
lower than the voltage at the battery terminals due to the voltage drop in the battery
cables and connectors. The drop in the voltage at the DC input terminals of the inverter
could be due to lower battery voltage or due to abnormally high drop in the cables if the
cables are not thick enough (Please read under
"Installation – Connection from the
) If the
batteries to the DC input side of the inverter – cable and fuse sizes" on page 20
voltage at the DC input terminals falls below 10.5 V for PST-15S-12A or 21 V for PST-
15S-24A, a buzzer alarm will be sounded. The LED (2) will continue to be green and the
AC output voltage will continue to be available. This warning buzzer alarm indicates that
the battery is running low and that the inverter will be shut down after sometime if the
voltage at the inverter terminals further drops to 10 V for PST-15S-12A or 20 V for PST-
15S-24A.
Shut-down due to low DC input voltage. If the inverter continues to power the load
after the low DC input voltage buzzer alarm is sounded, it will shut down temporarily
when the DC input voltage further drops below 10 V for PST-15S-12A or 20 V for PST-
15S-24A . The LED (2) will turn orange and there will be no AC output voltage. The
buzzer alarm will continue to sound.
The unit will reset automatically when the
voltage of the battery rises to 11.5 V for PST-15S-12A or 23 V for PST-15S-24A .
Shut-down due to high DC input voltage. If the voltage at the DC input terminals
exceeds 16.5 V for PST-15S-12A or 33 V for PST-15S-24A, the inverter will be shut
down temporarily. The LED (2) will turn orange and there will be no AC output.
The
buzzer will be sounded. The unit will be reset automatically when the voltage
drops down to 16.7 +/- 0.2 V for PST-15S-12A or 33.5 V +/- 0.2 for PST-15S-24A .
Page 25
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