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Troubleshooting
Panasonic ST4 Instruction Manual
82
Symptom
Cause
Remedy
Output polarity
was changed
during operation of
the device.
Turn OFF the power of the device and change
the output polarity.
Fault indicator
blinks nine times
•
Switch
setting
error
Output polarity
selection switch
(PNP/NPN setting)
Switch is broken.
Replace the ST4-C11.
Fault indicator
blinks ten times or
more
•
Effect
from
noise/power
supply or failure of
internal circuit
Affected by noise or power supply.
Internal circuit is damaged.
Check the noise condition around this device.
Check the wiring, supply voltage, and power
supply capacity.
If the error is not resolved, contact our office.
The beam axes are not correctly aligned.
Align the beam axes.
When connecting sensors in series, match the
sensor addresses between emitter and receiver
of ST4-A
□
.
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
for series connection.
Make sure that the colors of the connectors
match: gray: emitter, black: receiver.
Control output
indicator (green)
does not light up.
The connected ST4-A
□
is faulty.
Check the indicator of the connected ST4-A
□
(see "Connecting Multiple Sensors Heads" on
page 23).
For details, see "Troubleshooting of the Sensor
ST4-A
□
" on page 86.
If the device does not work normally after checking the items in the preceding table, contact our
office.
The blinking interval of the fault indicator (yellow) is shown in the following figure. There is
approx. 2 seconds between blinking cycles.
Blinking cycle of
the fault indicator
(yellow)
Lights up
Turns OFF
0.3 sec.
0.3 sec.
2 sec.
Number of blinks
Number of blinks
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CH - 5453 Busslingen
Tel. +41 (0)56 222 38 18
Fax +41 (0)56 222 10 12
www.sentronic.com
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