Kval 990-H, Service Manual

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Using Sensors to Trouble Shoot
KVAL 990-H Service Manual
4-18
Using Sensors to Trouble Shoot
• Photo Sensors often get dirty. Make sure they are clean. If they are not clean, debris
may block the signal or provide a false signal.
• Check output voltages of the sensors in the active mode. The voltage should effec-
tively equal 0 VDC
• Check the output voltages of the sensors in inactive mode.The voltage should effec-
tively equal 24 VDC
• The distance from an eye to the door should be in range. Typically the range should
be 3/4'' to 7/8'' from the top of all eyes to the door.
Location of Sensors on 990-H
Location and operation of sensors can be viewed by way of the
Diagnostic Screen.
Press the
Diagnostics and 990-H I/O
buttons to access the desired screen.
From these screens, view the operations of the sensors and identify the loca-
tions of sensors.
.