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Troubleshooting
Panasonic ST4 Instruction Manual
86
5.3 Troubleshooting of the Sensor ST4-A
□
Emitter-related problems
Symptom
Cause
Remedy
All indicators are
OFF.
Failure of cable connection.
Make sure that the connector is not loose.
In case of series connection, find the disconnected
part (the one for which the sensor's indicator lights
up).
The beam axes are not correctly
aligned.
Align the beam axes.
Normal operation is indicated when the sensor
receives the light beam and the interruption
indicator (red) turns OFF.
The beam
interruption
indicator (red) and
the stable incident
beam indicator
(green) light up
simultaneously.
The emitter is connected to another
emitter.
Check if the emitter is connected to the receiver
side.
Make sure that the colors of the connectors match:
gray: emitter, black: receiver.
The sensor is in the emission halt
condition.
Check that the emission halt input terminals
(between T1 and T2) of the controller are
short-circuited.
The beam
interruption
indicator (red) lights
up.
The sensor is damaged.
Replace the emitter of ST4-A
□
.
Receiver-related problems
Symptom
Cause
Remedy
Failure of cable connection.
Make sure that the connector is not loose.
In case of series connection, find the disconnected
part (the one for which the sensor's indicator lights
up).
All indicators are
OFF.
The sensor is in an unstable incident
beam condition.
Align the beam axes.
Normal operation is indicated when the stable
incident beam indicator (green) lights up.
The receiver of ST4-A
□
is wrongly
connected to the emitter connector of
the controller, and the emitter of
ST4-A
□
is wrongly connected to the
receiver connector of the controller.
Mixed connection of emitter and
receiver at series connection.
The beam
interruption
indicator (red) and
the stable incident
beam indicator
(green) light up
simultaneously.
The sensor is damaged.
Make sure that the colors of the connectors match:
gray: emitter, black: receiver.
The beam axes are not correctly
aligned.
Align the beam axes.
Normal operation is indicated when the interruption
indicator (red) turns OFF and the stable incident
beam indicator (green) lights up.
The beam
interruption
indicator (red) lights
up.
The receiver is connected to another
receiver.
Check if the receiver is connected to the emitter
side.
Make sure that the colors of the connectors match:
gray: emitter, black: receiver.
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