Banner EZ-SCREEN Low-Profile Safety Light Curtain Systems - Manual (Page 54)

52
P/N 133487
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
52
P/N 140044 rev. E
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Troubleshooting and Maintenance
5.3 Electrical and Optical Noise
The EZ-SCREEN LP 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 LP
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; or
• Sensor input or output wires routed too close to “noisy” wiring.
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 LP wiring is low voltage; running these wires
alongside power wires, motor/servo wires, or other high-voltage
wiring, can inject noise into the System. It is good wiring practice
(and may be required by code) to isolate EZ-SCREEN LP wires
from high-voltage wires.
The Banner model BT-1 beam tracker (see Section 2.4) is a
good tool for detecting electrical noise (transient spikes and
surges). Cover the lens of the beam tracker with electrical tape
to block optical light from the receiver lens. Press the “RCV”
button, and position the beam tracker on the wires going to the
EZ-SCREEN LP or any other nearby wires. Noise caused by
the switching of inductive loads will cause the beam tracker’s
indicator to light; address the noise problem by installing proper
transient suppression across the load.
Checking for sources of optical noise: Turn off the
EZ-SCREEN LP emitter, completely block its beams, or open the
Test input, then use a Banner BT-1 beam tracker to check for
light at the receiver. Press the “RCV” button and move the beam
tracker along the full length of the receiver’s sensing window.
If the beam tracker’s indicator lights, check for light from other
sources (other safety light screens, grids, or points, or standard
photoelectric sensors) by “tracking down” the emitted light from
them.
5.4 Servicing and Maintenance
Cleaning
EZ-SCREEN LP standard 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 alcohol, as they may
damage the acrylic lens covers.
Warranty Service
EZ-SCREEN LP components are designed for reliability. Do
not open the emitter or receiver housings, other than the
configuration access door. (Following configuration, close the
access door and tighten the screw to maintain IP65 status.)
Sensors contain no field-replaceable components. If repair
is necessary, do not attempt to repair an emitter or receiver
yourself; return the unit to the factory, as described below.
1. Contact a Banner Factory Application Engineer at the
address or numbers listed below or on the back page:
Banner Engineering Corp.,
9714 Tenth Avenue North
Minneapolis, MN 55441
Phone: 763.544.3164 or
Toll-Free (US only): 888.373.6767
email: [email protected]
They will attempt to troubleshoot the System from
your description of the problem. If they conclude that a
component is defective, they will issue a return merchandise
authorization (RMA) number for your paperwork, and give
you the proper shipping address.
2. Pack the component(s) carefully. Damage which occurs
during return shipping is not covered by warranty.
Opening a switch or relay contacts connected to the emitter Test
connections, or supplying a voltage of less than 3V dc to Test
only, simulates a Blocked condition, for testing purposes.
To verify proper operation, measure the voltage between emitter
Test (pin 8, violet) and dc COM (pin 6, blue) and refer to the
following table:
Supply
Voltage
Other Conditions Appropriate
Action
10 to 30V dc Emitter should be in
Run mode with beam
scanning occurring.
If not, check the
+24V dc (pin 1,
brown) to verify
proper supply
voltage
Outside the
rated supply
voltage
specifications
— Correct the supply
voltage and recheck
emitter operation.
10 to 30V dc Test1 is 10 to 30V dc,
but emitter is not in
Run mode with beam
scanning.
Replace the emitter.
Less than
3V dc
Emitter should be in Test
mode with no scanning
occurring.
If not in Test mode,
replace the emitter.
5.2 Test Mode (continued)