Panasonic ST4 Instruction Manual
5.2 Troubleshooting of Controller ST4-C12EX
83
5.2 Troubleshooting of Controller ST4-C12EX
First of all, check the wiring, the power supply voltage and the power supply capacity.
The display of the fault display (red) on ST4-C12EX varies depending on the condition of the
error as shown in the following table.
Symptom
Cause
Remedy
Power is not being supplied.
Check that the power supply capacity is
sufficient.
Connect the power supply correctly.
All indicators are
OFF.
Supply voltage is out of the specified
range.
Set the supply voltage to 24V DC
+10
-15
%.
Emission halt input
indicator (orange)
lights up.
The controller is in the emission
halt condition.
Check that the emission halt input
terminals (between T1 and T2)
short-circuit.
Reset input
terminal is not
wired.
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.
Relay is welded.
Replace the relay.
Relay response
time is slow.
Replace the relay with proper response time.
Interlock indicator
(yellow) lights up.
Reset condition is
not cancelled.
Reset signal at
start-up is not
input. (manually)
Use a momentary switch.
Replace the switch.
Large noise
Check the noise condition around this device.
Fault display:
•
Setting data error
Internal error
Replace the ST4-C12EX.
The emitters and receivers are of
different types.
Use the same type of emitter and receiver. Do
not mix them.
Series connection condition is out of the
specified range.
Set the series connection condition within the
specified range (see "Connecting Multiple
Sensors Heads" on page 23).
The serial signal short-circuits.
Check that the cable of ST4-A
□
, ST4-CCJ
□
(optional) or ST4-CCJ05-WY (optional) is not
disconnected and the connectors are not loose.
Fault display:
•
System
between
emitter and
receiver on
ST4-A
□
error
The connected ST4-A
□
is faulty.
Perform the sensor diagnosis function (see page
71).
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.
Fault display:
•
Control
output
(OSSD 1/2) error
Control output (OSSD 1/2) short-circuits
with other I/O wires, or the control output
(OSSD 1/2) short-circuits with other
control output (OSSD 1/2).
Wire the control output (OSSD 1/2) wires
correctly (see page 36).
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