Kval MLX, Operation And Service Manual

Page: 134 / 144

About Switches and Sensors
KVAL MLX Operation/Service Manual
6-16
.
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.
The L imit Switch is activated by an assembly moving a switch arm.
• .Depending on the model of limit switch, the
amount of “pre-travel” (amount of movement from
the arms resting position) is either 5 or 20 degrees
before the limit switch actuates (Clicks).
Switch Arm