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12.6 Test Mode
If System will not align or go to a Green/Clear condition, the emitter’s Test input may be open. If so, the receiver Reset
indicator will be Yellow, all Zone indicators Red, and the Status LED Red; the 7-segment display will show a numerical value
equal to the total number of beams, minus one. (Multiple-digit codes are displayed sequentially.) For example, if an array
has 55 beams total, the display would indicate 54. The emitter’s Status indicator will flash Green. See
70) and
Receiver
Emitter
Dash
Flashing Green
Yellow
Red
Number of Beams
Yellow or OFF
All Red
(less one)*
Figure 45. Test Mode
*The 7-segment display sequentially shows a numerical value equal to one less than the total number of beams. For
example, if an array has 55 beams total, the display indicates 54.
Opening a switch or relay contacts connected to the emitter Test connections, or supplying a voltage of less than 3 V 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 30 V dc
Emitter should be in Run mode with beam scanning condition
If not, check the +24 V 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 30 V dc
Test1 is 10 to 30 V dc, but emitter is not in Run mode with beam
scanning
Replace the emitter
Less than 3 V dc
Emitter should be in Test mode with no scanning occurring
If not in Test mode, replace the emitter
12.7 Electrical and Optical Noise
The EZ-SCREEN LPM 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. To minimize the effects of transitory noise, the EZ-SCREEN
LPM 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
12.7.1 Check for Sources of Electrical Noise
It is 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 LPM 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 LPM System. It is good wiring practice (and may be required by code)
to isolate EZ-SCREEN LPM wires from high-voltage wires.
EZ-SCREEN Low-Profile System with Integral Muting
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