Wallen “S” voltage convertors use intelligent
monitoring circuitry as a safety feature designed into the convertor,
to provide soft and non-damaging shutdown.
Two LEDs on the front interconnection
panel indicate the operating status of the voltage covertor:
If the green
LED is lit, the convertor is operating normally.
If neither the
green nor the
red LED is lit, there is a 24V
red LED is lit, then there is a
problem on the output side - probably a short circuit or a wrong-polarity