Troubleshooting Of Controller St4-C11 - Panasonic ST4 Instruction Manual

Troubleshooting

5.1 Troubleshooting of Controller ST4-C11

First of all, check the wiring, the power supply voltage and the power supply capacity.
The number of blinks of the fault indicator (yellow) on ST4-C11 varies depending on the
condition of error as shown in the following table.
Symptom
All indicators are
OFF.
Emission halt input
indicator (orange)
lights up.
Interlock indicator
(yellow) lights up.
Fault indicator
lights up
Microcomputer
error
Fault indicator
blinks once
• Error between
emitter and
receiver of
ST4-A□
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Cause
Power is not being supplied.
Supply voltage is out of the specified
range.
The controller is in the emission halt
condition.
Reset condition is Reset input
not cancelled. terminal is not
wired.
Relay is welded.
Relay response
time is slow.
Reset signal at
start-up is not
input. (manually)
Large noise
Internal error
The emitters and receivers are of
different types.
Series connection condition is out of the
specified range.
The serial signal short-circuits.
The connected ST4-A□ is faulty.
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CH - 5453 Busslingen
Panasonic ST4 Instruction Manual
Remedy
Check that the power supply capacity is
sufficient.
Connect the power supply correctly.
Set the supply voltage to 24V DC
Check that the emission halt input terminals
(between T1 and T2) short-circuit.
Wire the reset input terminals correctly (manual
reset: between X1 and X2, or auto reset:
between X1 and X3).
To ensure the safety of the system, use the NC
contact of a forcibly guided relay.
Replace the relay.
Replace the relay with proper response time.
Use a momentary switch.
Replace the switch.
Check the noise condition around this device.
Replace the ST4-C11.
Use the same type of emitter and receiver. Do
not mix them.
Set the series connection condition within the
specified range (see "Connecting Multiple
Sensors Heads" on page 23).
Check that the cable of ST4-A□, ST4-CCJ□
(optional) or ST4-CCJ05-WY (optional) is not
disconnected and the connectors are not loose.
Check the indicator of the connected ST4-A□
(see "Connecting Multiple Sensors Heads" on
page 23).
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