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Panasonic ST4 Instruction Manual
5.1 Troubleshooting of Controller ST4-C11
81
Symptom
Cause
Remedy
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)
Control output (OSSD 1/2) short-circuits
with +V or 0V.
Wire the control output (OSSD 1/2) wires
correctly (see page 36).
The PNP/NPN settings of the output
polarity selection switch and the control
output (OSSD 1/2) do not match.
Check the output polarity selection switch.
Fault indicator
blinks twice
•
Control
output
(OSSD 1/2) error
1
Output circuit error.
Output circuit is damaged.
Replace the ST4-C11.
Excessive incoming current flows in the
control output (OSSD 1/2).
Current value should be within the specified
control output (OSSD 1/2).
For details, see "Specifications, Controller
ST4-C12EX" on page 90.
Control output (OSSD 1/2) short-circuits
with +V or 0V.
Wire the control output (OSSD 1/2) wires
correctly (see page 36).
The PNP/NPN settings of the output
polarity selection switch and the control
output (OSSD 1/2) do not match.
Check the output polarity selection switch.
Wire the control output (OSSD 1/2) wires
correctly (see page 36).
Fault indicator
blinks three times
•
Control
output
(OSSD 1/2) error
2
Output circuit error.
Output circuit is damaged.
Replace the ST4-C11.
Fault indicator
blinks four times
•
Extraneous
light
error
Extraneous light is entering or light from
other ST4-A
□
is entering.
When the power is ON, prevent any extraneous
light from entering the receiver.
If the extraneous light is coming from ST4-A
□
,
execute the interference prevention function
see "Interference Prevention Function" on page
54.
In case of ST4-A
□
V, execute the emission
amount adjustment function (see page 57) as
well.
If the error could not be resolved, contact our
office.
Fault indicator
blinks seven times
•
Reset
error
Voltage level of reset input signal is
unstable.
Wire the reset input terminals correctly (manual
reset: between X1 and X2, or auto reset:
between X1 and X3).
Supply voltage is out of the specified
range.
Set the supply voltage to 24V DC
+10
-15
%.
Fault indicator
blinks eight times
•
Input
voltage
monitor error
Internal reference voltage error.
Check the power supply capacity.
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