AC and DC-PNP versions with valve plug
Malfunction
Cause
Green light does
No voltage supply
not light up
Red light
Overload or short-circuit
flashes
in the load-current circuit
Internal sensor error or
sensor corroded
DC-PNP versions with M12 x 1 plug
Malfunction
Cause
Red light
Overload or short-circuit in
lights up
the load-current circuit
(DC-PNP)
Green light does
No voltage supply
not light up
Red light
Internal sensor error or
flashes (2 Hz)
sensor corroded
NAMUR
Malfunction
Cause
Green light is not
No voltage supply from
flashing
switching amplifier
Red light
Internal sensor error or
flashes (0.3 Hz)
sensor corroded
Measure
Check plug, cable and
voltage supply
Rectify short-circuit
Reduce maximum load
current to under 350 mA
Replace device
Measure
Rectify short-circuit
Reduce maximum load
current to under 250 mA
Check plug, cable and
voltage supply
Replace device
Measure
Check plug, cable and
voltage supply
Replace device
Trouble-shooting
51