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LED Status
Alignment Top
Yellow flashing
Alignment Bottom
Yellow OFF
Status Blocked
Red flashing
Status Clear
Green OFF
Alignment Top
Yellow OFF
Alignment Bottom
Yellow OFF
Status Blocked
Red flashing
Status Clear
Green OFF
Alignment Top
Yellow OFF
Alignment Bottom
Yellow OFF
Status Blocked
Red ON
Status Clear
Green ON
Alignment Top
Yellow OFF
Alignment Bottom
Yellow OFF
Status Blocked
Red ON
Status Clear
Green flashing
Alignment Top
Yellow OFF
Alignment Bottom
Yellow OFF
Status Blocked
Red OFF
Status Clear
Green OFF
6.3 Electrical and Optical Noise
The EZ-SCREEN Type 2 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 In very extreme electrical noise cases, a Lockout
is possible. To minimize the effects of transitory noise, the EZ-SCREEN Type 2 responds to noise only if the noise is detected on multiple
consecutive scans.
If random nuisance Trips occur, check the following:
•
Poor connection between the sensor and earth ground
•
Optical interference from adjacent light screens or other photoelectrics
•
Sensor input or output wires routed too close to noisy wiring
6.3.1 Sources of Electrical Noise
Checking for sources of electrical noise: It is very important that the light screen sensors have a good earth ground. Without this, the
System can act like an antenna and random Trips and Lockouts can occur.
All EZ-SCREEN Type 2 wiring is low voltage; running these wires alongside power wires, motor/servo wires, or other high-voltage wiring,
can inject noise into the EZ-SCREEN Type 2 System. It is good wiring practice (and may be required by code) to isolate EZ-SCREEN Type 2
wires from high-voltage wires.
The Banner model BT-1 Beam Tracker (see
detect electrical transient spikes and surges. Cover the lens of the BT-1 with electrical tape to block optical light from entering the
receiver lens. Press the RCV button on the BT-1 and position the Beam Tracker on the wires going to the EZ-SCREEN Type 2 or any other
nearby wires. The noise caused by switching of the inductive loads should be addressed by installing proper transient suppression
across the load.
6.3.2 Sources of Optical Noise
Checking for sources of optical noise: Turn off the emitter, completely block the emitter, or open the Test input, then use a Banner BT-1
Beam Tracker (see
Alignment Aids
the full length of the receiver's sensing window. If the BT-1's indicator lights, check for emitted light from other sources (other safety
light screens, screens or points, or standard photoelectric sensors).
Possible Cause and Appropriate Action
Optical Fault
If the condition continues, contact Factory.
Internal Fault
If the condition continues, contact Factory.
Reset/Test Input Fault
Test Mode - Reset/Test input is open.
Power Supply Failure - Check power supply.
Alignment Aids
on page 52 ) is a good tool for detecting electrical noise. It can be used to
on page 52 ) to check for light at the receiver. Press the RCV button on the BT-1 and move it across
www.bannerengineering.com - Tel: 763.544.3164
Receiver
•
Open Reset/Test for at least 0.25 seconds and close.
•
Check for optical interference or noise.
•
Open Reset/Test for at least 0.25 seconds and close.
•
Check the power supply for low or erratic voltage, or excessive electrical
noise.
•
Verify the sensor has a good earth ground.
•
Reset/Test input open at power-up.
•
Switch the device OFF, verify the Reset/Test input is connected to +24 V
dc (e.g., the reset button or switch is closed) and reapply power.
®
EZ-SCREEN
Type 2 Light Screen
39
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