Troubleshooting Of The Sensor St4-A - Panasonic ST4 Instruction Manual

Troubleshooting

5.3 Troubleshooting of the Sensor ST4-A□

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