8 Troubleshooting
8.1 Lockout Conditions
A Lockout condition causes both S4B OSSD outputs to turn off or remain off, sending a stop signal to the guarded machine.
Each sensor provides diagnostic error codes to identify the cause(s) of lockouts (see
on page 42).
The following tables indicate a sensor lockout condition:
Emitter Lockout Conditions
Status indicator
Flashing Red
Receiver Lockout Conditions
Status indicator
Flashing Red
Zone indicators
on page 42
To recover from a Lockout condition, correct all errors and cycle power to the device.
8.2 Receiver Error Codes
Indicators
Error Description
Appropriate Action
Flashing
Output Error
caused by:
•
one or both outputs being shorted to a
power supply (high or low)
•
by shorting OSSD 1 to OSSD 2
•
by an overload (greater than 0.5 A)
•
Disconnect the OSSD loads and reset the receiver.
•
If the error clears, the problem is in the OSSD load(s) or in the
load wiring.
•
If the error continues with no load connected, replace the
receiver.
Flashing
Receiver Error
occurs because of excessive
electrical noise or an internal failure
•
Perform a reset per Checkout Procedures: Shift and Daily
Checkout Procedure.
•
If the error clears, perform a Daily Checkout procedure (per
Checkout Procedures: Shift and Daily Checkout Procedure;
Daily Checkout Card) and if the System checks out, resume
operation. If the System fails the Daily Checkout procedure,
replace the receiver.
•
If the error clears, check the external connections and
configuration settings.
•
If the error continues, replace the receiver.
8.3 Electrical and Optical Noise
The S4B is designed and manufactured to be highly resistant to electrical and optical noise and to operate reliably in
industrial settings. However, serious electrical and/or optical noise may cause a random nuisance trip.
In extreme electrical noise cases, a Lockout is possible. To minimize the effects of transitory noise, the S4B responds to
noise only if the noise is detected on multiple consecutive scans. If random nuisance trips occur, check the following:
•
Optical interference from adjacent light screens or other photoelectrics
•
Sensor input or output wires routed too close to noisy wiring
8.3.1 Checking for Sources of Electrical Noise
All S4B wiring is low voltage; running these wires alongside power wires, motor/servo wires, or other high-voltage wiring can
inject noise into the S4B System. It is good wiring practice (and may be required by code) to isolate S4B wires from high-
voltage wires.
1. Use the Banner model BT-1 Beam Tracker Alignment Aid (see
on page 47) to detect electrical
transient spikes and surges.
2. Cover the lens of the BT-1 with electrical tape to block optical light from entering the receiver lens.
S4B Safety Light Curtain
42
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