How to Wire and Test Limit Switch?

The limit switch is a commonly used small current master electrical appliance. It utilizes the collision of the moving parts of the production machinery to make or break the control circuit to achieve certain control purposes. Usually, ATO limit switch is used to limit the position or stroke of mechanical movement, so that the moving machinery can automatically stop, reverse movement, variable speed movement or automatic round-trip movement according to a certain position or stroke.

The limit switch can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as still life) or on moving objects. When the animal approaches the still life, the contact of its connecting rod drives the switch to cause the closed contact to break or the open contact to close. The circuit and mechanism are controlled by the change of the open and closed states of the switch contacts.

ATO limit switch, its rated current and voltage are customizable, such as 10A/120VAC, 2A/48VDC, etc. It also has fully enclosed 1NO + 1NC contact, which is cast from high-temperature resistant material.

Wiring and Testing

1st, open the shell. There are a pair of NO contacts and NC contacts.

2nd, let's test its NO contacts. Turn on the roller limit switch. When the limit switch is pressed, the coil of the contactor is energized and the contact is attracted.

Finally, connect NC contacts. By default, the contactor coil is closed. Wiring and testing are complete.

See the video below for more information on wiring and testing the roller limit switch.