Troubleshooting
SF4C Safety light curtain
108
6.2.4 Fault
Indicator
(Yellow) Lights up or Blinks
Error
Cause
Remedy
Noise is outside the specified range.
Check the noise status around this
device.
[Digital error indicator: ]
Error in the setting data of SF4C
Internal error
Replace this device.
[Digital error indicator: ]
System error between emitter
and receiver
Different types of emitter and receiver
have been connected
Only pair up emitters and
receivers of the same type, i.e.
with the same number of beam
channels.
[Digital error indicator: ]
Extraneous light error
Extraneous light is entering or light from
other model is entering.
When the power is on, prevent any
extraneous light from entering the
receiver, if the extraneous light is
coming from other models see
"Device Placement" on page 22.
Control output 1 (OSSD 1) wire (black)
or control output 2 (OSSD 2) wire
(white) is short-circuited.
Control output 1 (OSSD 1) wire (black)
or control output 2 (OSSD 2) wire
(white) is not correctly wired or is wired
with other I/O wires.
Excessive incoming current flows in
control output 1 (OSSD 1) wire (black)
or control output 2 (OSSD 2) wire
(white).
Wire the control output 1 (OSSD 1)
wire (black) and the control output
2 (OSSD 2) (white) correctly.
The current value for the control
outputs should be within the
specified range "Wiring" on page
34.
The output polarity setting wire (shield),
the control output 2 (OSSD 2) wire
(white) is not correctly wired.
Wire the output polarity setting
wire (shield) correctly.
(0V: PNP, +V: NPN output)
Wire the output polarity setting
wire (shield) of the receiver
correctly "Wiring" on page 34.
[Digital error indicator: ]
Control output (OSSD1/2) data
error
Output circuit error.
The output circuit is damaged.
Replace this device.
[Digital error indicator: ]
Wiring error of the output polarity
setting wire (shield)
•
The output polarity setting wire
(shield) comes down or
short-circuits with other I/O wires.
•
The output polarity setting wire
(shield) connection of the
emitter/receiver is incorrect.
Wire the wire output polarity
setting (shield) correctly.
(0V: PNP output, +V: NPN output)
Relay contact is
welded.
Replace the relay.
Response time of
the relay is slow.
Replace the relay with a proper
response time (see page 73).
[Digital error indicator: ]
External device error
When using the
safety relay
Contact point "b"
of the relay is not
wired.
Wire the contact point correctly.
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