Proximity Switch Testing

Grounding hsi sensing can check a proximity sensor that contains a wire connected to the metal housing.

Proximity switch testing.

The test voltage is typically 100 volts. If not you could have uncontrolled motion from other sources due to conditions in the ladder logic. When this field is interrupted by a conductive object moving into the field the switch will detect this and cause a contact closure or opening based on the type of proximity switch. Testing switches proximity solenoids contactors or relays.

The proximity switch generates a small radio frequency field. This test can be done in ac and or dc voltage. For technical drawings and 3 d models click on a part number. By definition these switches are non contact sensors using magnetic electric or optical means to sense the proximity of objects.

Dc 2 3 or 4 wire type sensors. Allows for fast field checks troubleshooting and or demonstration of 10 30 v dc sensors with a maximum sensor current draw of 100 ma. The proximity switch usually has 3 specific wires going to the switch. Make sure to put the machine in e stop when testing the switches or solenoids manually to check there diagnostics.

Pocket sized sensor tester with push type terminals makes wire connections quick and easy. Insulation resistance this test measures the dc resistance across the open contacts measured in ohms with an ohm meter and the switch in a de energized state. Testers for proximity and photoelectric switches verify the signal output type of dc switches a red light indicates npn and a green light indicates pnp.