Omron JAPAN
Limit Switch
Refer to Safety Precautions for All Limit Switches.
• When a rod or wired-type actuator is used, do not touch the top end of the actuator. Doing so may result in injury. (Applicable models) WLHAL5 and WL01HAL5 Rod Spring Levers and WLNJ-S2 and WL01NJ-S2 Steel-wire Actuators.
• A short-circuit may cause damage to the Switch, so insert a circuit breaker fuse, of 1.5 to 2 times the rated current, in series with the Switch.
• In order to meet EN approval ratings, use a 10-A fuse that corresponds to IEC60269, either a gI or gG for general-purpose types and spatter-prevention models only.
• When wiring terminal screws, use M4 round crimp terminals and tighten screws to the recommended torque. Wiring with bare wires, or incorrect crimp terminals, or not tightening screws to the recommended torque can lead to short-circuits, leakage current, and fire.
• When performing internal wiring there is a chance of short-circuit, leakage current, or fire, so be sure to protect the inside of the Switch from splashes of oil or water, corrosive gases, and cutting powder.
• Using an inappropriate connector or assembling Switches incorrectly (assembly, tightening torque) can result in malfunction, leakage current, or fire, so be sure to read the instruction manual thoroughly beforehand.
• Even when the connector is assembled and set correctly, the end of the cable and the inside of the Switch may come in contact. This can lead to malfunction, leakage current, or fire, so be sure to protect the end of the cable from splashes of oil or water and corrosive gases. Operating Environment
• Seal material may deteriorate if a Switch is used outdoor or where subject to special cutting oils, solvents, or chemicals. Always appraise performance under actual application conditions and set suitable maintenance and replacement periods.
• Install Switches where they will not be directly subject to cutting chips, dust, or dirt. The Actuator and Switch must also be protected from the accumulation of cutting chips or sludge.
• Constantly subjecting a Switch to vibration or shock can result in wear, which can lead to contact interference with contacts, operation failure, reduced durability, and other problems. Excessive vibration or shock can lead to false contact operation or damage. Install Switches in locations not subject to shock and vibration and in orientations that will not produce resonance.
• The Switches have physical contacts. Using them in environments containing silicon gas will result in the formation of silicon oxide (SiO2) due to arc energy. If silicon oxide accumulates on the contacts, contact interference can occur. If silicon oil, silicon filling agents, silicon cables, or other silicon products are present near the Switch, suppress arcing with contact protective circuits (surge killers) or remove the source of silicon gas.
Using Switches for Micro Loads
Contact faults may occur if a Switch for a general-load is used to switch a micro load circuit. Use switches in the ranges shown in the diagram below. However, even when using micro load models within the operating range shown here, if inrush current occurs when the contact is opened or closed, it may increase contact wear and so decrease durability. Therefore, insert a contact protection circuit where necessary. The minimum applicable load is the N-level reference value. This value indicates the malfunction reference level for the reliability level of 60% (λ60). The equation, λ60 = 0.5 × 10–6/operations indicates that the estimated malfunction rate is less than 1/2,000,000 operations with a reliability level of 60%.
Using the Switches
Changing the Installation Position of the Actuator
By loosening the Allen-head bolt on the actuator lever, the position of the actuator can be set anywhere within the 360°. With Indicator-equipped Switches, the actuator lever comes in contact with the top of the indicator cover, so use caution when rotating and setting the lever. When the lever only moves forwards and backwards, it will not contact the lamp cover (except for long-life models).
Applicable models and Actuators
Roller Levers: WLCA2, WL01CA2, WLCA2-2, WL01CA2-2, WLH2, WL01H2, WLMCA2*, WLMH2*
Adjustable Roller Levers: WLCA12, WL01CA12, WLCA12-2, WL01CA12-2, WLH12, WL01H12
Adjustable Rod Levers: WLCL, WL01CL, WLCL-2, WL01CL-2, WLHL, WL01HL
Changing the Orientation of the Head
By removing the screws in the four corners of the Head, the Head can be set in any of the four directions. Be sure to change the plunger for internal operations at the same time. (The operational plunger does not need to be changed on general-purpose overtravel models.) The roller plunger can be set in either two positions at 90°. WLCA2-2N and WL01CA2-2N can be set only in either the forward or backward direction.
Roller Levers: WLCA*, WL01CA*, WLCA*-2, WL01CA*-2, WLH*, WL01H*, WLMCA2*, WLMH2*
Adjustable Rod Levers: WLCL, WL01CL, WLCL-2, WL01CL-2
Horizontal Plungers: WLSD@, WL01SD@ Top-roller Plungers: WLD2, WL01D2
Sealed Top-roller Plungers: WLD28, WL01D28
Does not include -RP60 Series or -141 Series.
Changing the Operating Direction
By removing the Head on models which can operate on one-side only, and then changing the direction of the operational plunger, one of three operating directions can be selected. For overtravel 90° operation models, one of three operating directions can be selected by loosening the rubber holder using either a coin or a flat-blade screwdriver and changing the direction of the internal rubber section. The tightening torque for the screws on the Head is 0.78 to 0.88 N•m.
Roller Levers: WLCA2, WL01CA2
Adjustable Roller Levers: WLCA12, WL01CA12 Adjustable
Rod Levers: WLCL, WL01CL
Overtravel Models: WLCA*-2N, WL01CA*-2N
Loosen the M5 × 12 bolt, set the actuator's position and then tighten the bolt again.
Head Head Loosen the screws. Loosen the screws. Operating Operating Operation in both directions Not operating Operating Clockwise operation Operating Not operating Operational plunger Counterclockwise operation Operation on both sides Operates Operates Operates Does not operate Operation on one side Does not operate Operates Operation on one side Avoid this combination One-side Operation for General-purpose Switches
Cam Direction Changing Procedure for Overtravel, 90° Operation Switches Relationship of cam to operation as observed from the rear of Switch The output of the Switch will be changed, regardless of which direction the lever is pushed. The output of the Switch will only be changed when the lever is pushed in one direction. Loosen the cam holder with a coin or screwdriver. Take out the cam from the Switch. Change the direction of the cam as required by your intended operation and then reinstall the cam.
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