Manual 82510
Magnetic Pickups and Proximity Switches
Woodward
14
Checking Proximity Switch Operation
To check the operation of a proximity switch, a load resistance must be placed across the terminals from
which the speed control speed sensor was removed. An oscilloscope may provide adequate load
resistance.
Proximity Switch Wiring
The proximity switches supplied by Woodward are wired for a “sinking” type output. Figure 2-2 shows a
typical wiring method. Other proximity switches, not supplied by Woodward, are wired dc “source”. Figure
2-3 shows a typical dc source wiring method. AC proximity switches are seldom used with Woodward
controls.
Figure 2-2. Suggested Wiring for a “Sinking” Type Proximity Switch
Figure 2-3. Suggested Wiring for a “Source” Type Proximity Switch
Released
