Precautions for All Limit Switches

(Not including Safety Switches)
Note: Refer to the Precautions section for each Switch for specific precautions applicable to each Switch.

If the Switch is to be used as a switch in an emergency stop circuit or in a safety circuit for preventing accidents resulting in injuries or deaths, use a Switch with a direct opening mechanism, use the NC contacts with a forced release mechanism, and set the Switch so that it will operate in direct opening mode.
For safety, install the Switch using one-way rotational screws or other similar means to prevent it from easily being removed. Protect the Switch with an appropriate cover and post a warning sign near the Switch in order to ensure the safety.

Do not supply electric power when wiring. Otherwise electric shock may result.

Keep the electrical load below the rated value

Be sure to evaluate the Switch under actual working conditions after installation.

Do not touch the charged switch terminals while the Switch has carry current, otherwise electric shock may result.

If the Switch has a ground terminal, be sure to connect the ground terminal to a ground wire.

Do not disassemble the Switch while electric power is being supply. Otherwise electric shock may result.

The durability of the Switch greatly varies with switching conditions. Before using the Switch, be sure to test the Switch under actual conditions. Make sure that the number of switching operations is within the permissible range.
If a deteriorated Switch is used continuously, insulation failures, contact weld, contact failures, switch damage, or switch burnout may result.

Maintain an appropriate insulation distance between wires connected to the Switch.

Some types of load have a great difference between normal current and inrush current. Make sure that the inrush current is within the permissible value. The greater the inrush current in the closed circuit is, the greater the contact abrasion or shift will be. Consequently, contact weld, contact separation failures, or insulation failures may result. Furthermore, the Switch may become broken or damaged.

Wiring

Pay the utmost attention so that each terminal is wired correctly. If the terminal is wired incorrectly, the Switch will not function.
Furthermore, not only will the Switch have a bad influence on the external circuit, the Switch itself may become damaged or burnt.

Mounting

Do not modify the actuator, otherwise the operating characteristics and performance of the actuator will change.

Do not enlarge the mounting holes of the Switch or modify the Switch. Doing so may result in insulation failures, housing damage, or physical injuries.

Be sure to evaluate the Switch under actual working conditions after installation.

Do not apply oil, grease, or other lubricants to the moving parts of the actuator, otherwise the actuator may not operate correctly.
Furthermore, intrusion of oil, grease, or other lubricants inside the Switch may reduce sliding characteristic or cause failures in the Switch.

Mount the Switch and secure it with the specified screws tightened to the specified torque along with flat washers and springs. The actuator of a Pushbutton Limit Switch mounted to a panel with excessive tightening torque may not operate correctly.

Be sure to wire the Switch so that the conduit opening is free of metal powder or any other impurities.

If glue or bonding agent is applied, make sure that it does not adhere to the movable parts or intrude inside the Switch, otherwise the Switch may not work correctly or cause contact failure. Some types of glue or bonding agent may generate a gas that may have a bad influence on the Switch. Pay the utmost attention when selecting the glue or locking agent.

Do not drop or disassemble the Switch, otherwise the Switch will not be capable of full performance. Furthermore, the Switch may become broken or burnt.

Some models allow changes in head directions. When changing the head of such a model, make sure that the head is free of any foreign substance. Tighten each screw of the head to the rated torque.

Be sure to take measures so that no foreign material, oil, or water will penetrate into the Switch through the conduit opening. Be sure to attach a connector suited to the cable thickness and tighten the connector securely to the rated torque.

Do not impose shock or vibration on the actuator while it is fully pressed. Otherwise, the actuator will partially abrade and an actuation failure may result.

Wiring

If the wiring method is incorrect, the wires may get caught on objects or the lead wires may be pulled excessively. Make sure that the lead wires are sufficiently long and secure them along the wiring path.

Pay the utmost attention so that each terminal is wired correctly. If a terminal is wired incorrectly, the Limit Switch will not function properly. Furthermore, not only will the Limit Switch have an adverse influence on external circuits, the Limit Switch itself may become damaged or burnt.