Safety Switch
Safety Switch Magnet
Safet
Blade
Fig 24
3. Test for continuity at the terminals of the switch with the Safety Blade resting between
the switch and the magnet. The switch should measure as OPEN.
4. If the switch measures CLOSED make sure the blade is resting squarely between the
switch and magnet. Otherwise the distance between the switch and magnet may need
to be increased by 1/16”. If no more adjustment can be made, flip the magnet 180
degrees to see if that will allow the switch to open during testing.
5. When pressing the Safety Buttons, the switch should measure CLOSED. If the switch
measures OPEN, the distance between the switch and magnet may need to be de-
creased by 1/16”.
6. If the switch will not change from OPEN to CLOSED when the Safety Blade is raised
de-spite adjustment, replace the switch and the magnet.
TSM-21 Diagnostic Manual Parker/Humphrey Solenoids
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