Electrical and optical noise, Sources of electrical noise, Sources of optical noise – Banner EZ-SCREEN Safety Light Curtain Systems User Manual
Page 49: Servicing and maintenance, Cleaning
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 Trip or Latch condition. In very extreme electrical
noise cases, a Lockout is possible. In order to minimize the effects of transitory noise, the EZ-SCREEN Type 2 will respond 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.
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 highvoltage wiring,
can inject noise into the EZ-SCREEN Type 2. 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
on page 65) is a very good tool for detecting electrical noise. It can be used
to detect electrical transient spikes and surges. Cover the lens of the BT-1 with electrical tape to block optical light from getting into 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. Noise caused by the switching of inductive loads should be addressed by installing proper transient suppression
across the load.
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 to check for light at the receiver. Press the “RCV” button on the BT-1 and move it across the full length of the receiver’s
sensing window. If the BT-1’s indicator lights, check for light from other sources (other safety light screens, screens or points, or standard
photoelectric sensors) by “tracking down” the emitted light from them.
Servicing and Maintenance
Cleaning
EZ-SCREEN Type 2 emitters and receivers are constructed of aluminum with a yellow painted finish and are rated IP65. Lens covers are
acrylic. Emitters and receivers are best cleaned using mild detergent or window cleaner and a soft cloth. Avoid cleaners containing alco-
hol, as they may damage the acrylic lens covers.
EZ-SCREEN® Type 2 Light Screen Instruction Manual
122452 rev. B
www.bannerengineering.com - tel: 763-544-3164
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