Questions You Should Know about how to test micro switch

JohnnieB

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Re: Microswitch

The distinction between a two-terminal and three-terminal microswitch is that one set of contacts (either the NC or NO) is not installed. The spring that returns the wiper ("C" or Common contact) to the NC (Normally Closed) contact is typically made of a curved piece of Beryllium Copper (BeCu), although other spring types can be utilized as well. Regardless of the spring type used, the return spring is the most fragile mechanical component of a microswitch and is usually the first to fail. The contact points are relatively small and susceptible to failure due to pitting (Arcing) and corrosion; however, with appropriate electrical design, they generally last longer than the spring. The microswitches utilized by EZGO for F/R and Throttle assemblies typically use the NC contacts for "GO," and mechanically open them for "NO-GO." Consequently, if the weak little spring fails, the cart becomes "NO-GO," preventing it from becoming a runaway half-ton wheeled object. (Some of the carts manufactured before legal compliance, like the one you possess, may utilize different switch configurations.)

Matt - instead of directly answering your questions, let's approach it this way. The difference between a two-terminal and three-terminal microswitch is that one set of contacts (either the NC or NO) is not installed. The spring that returns the wiper ("C" or Common contact) to the NC (Normally Closed) contact is generally an arched piece of Beryllium Copper (BeCu); however, various types of springs are used. Regardless of the spring mechanism used, the return spring remains the weakest mechanical component of a microswitch and typically fails first. The contact points, although small, can fail due to pitting (Arcing) and corrosion, but with sound electrical engineering, they usually outlast the spring. EZGO's microswitches used for F/R and Throttle assemblies predominantly use NC contacts for "GO" and mechanically release them for "NO-GO," ensuring that when the weak spring fails, the cart remains "NO-GO" instead of turning into a runaway vehicle. (Certain carts designed before the legal changes, like the one you have, may feature different switch configurations.)

Micro switches are critical components in numerous electronic devices, acting as a triggering mechanism that activates during specific physical movements. Found in products ranging from game controllers to washing machines and vending machines, microswitches can fail or become defective over time due to wear and tear. This article outlines how to identify if a micro switch is bad or of poor quality.

Steps to Evaluate the Quality of Micro Switches

Inspect for Physical Damage:

The initial step in troubleshooting a faulty microswitch involves checking for any physical damage. Inspect the switch for cracks, chips, or visible signs of damage. Additionally, see if the switch feels loose or unstable when pressed. If the switch appears damaged, it is probably no longer operational and needs replacing.

 

Conduct a Continuity Test:

If the switch seems intact, the next step is to perform a continuity test using a multimeter, which measures the electrical continuity between two points. Start by configuring the multimeter to measure resistance (ohms) and touch one probe to each terminal of the switch. In its resting state (not pressed), the multimeter should read infinity (indicating no continuity). When pressed, the multimeter should read zero (indicating continuity).

 

If there's no change in the multimeter reading upon pressing the switch, this indicates the switch is faulty. Conversely, if it continuously reads zero when the switch isn't pressed, it suggests the switch is stuck in the closed position and is also defective.

 Basic Micro Switch

Evaluate Actuation Force:

The actuation force refers to the pressure necessary to activate the switch. Should the actuation force be excessively high or low, the switch may not operate correctly. To test this, press the switch multiple times and record the force needed for activation. A significant deviation from the expected force indicates a likely fault.

 

Contact us to discuss your requirements of how to test micro switch. Our knowledgeable sales team is available to help you determine the options that best suit your needs.

Listen for a Click:

Activation of a micro switch should produce an audible click, signifying that the switch's contacts have closed, thereby completing the electrical circuit. A switch that does not emit a click indicates improper closing of the contacts and signals a fault.

 

Test for Bouncing:

When activated, the contacts of a switch may bounce before stabilizing. Such bouncing can lead to issues with certain electronics. To assess this, connect the switch to a circuit and activate it several times. Erratic behavior in the circuit upon activation indicates contact bouncing and signifies a fault in the switch.

 

Check for Proper Alignment:

Micro switches function optimally only when correctly aligned. Misalignment can inhibit proper function and potentially lead to premature failure. Inspect the switch's actuator to ensure it is aligned with the switch's contacts; if not, make necessary adjustments.

 

Inspect for Dirt and Debris:

Accumulations of dirt and debris can impede the performance of micro switches. When contaminants build up on the contacts, they can obstruct proper connections, resulting in a faulty switch. Check the switch's contacts and actuator for any debris; if found, clean it gently using a soft-bristled brush or compressed air.

Indicators of a Faulty Micro Switch

&#; No Continuity: A lack of continuity on the multimeter when expected indicates a potentially faulty switch.

&#; Inconsistent Readings: Fluctuating readings can suggest internal issues within the switch.

&#; No Actuation Response: A switch that fails to react to plunger movement may be defective.

&#; Burn Marks or Corrosion: The presence of these markings signals electrical faults.

Should you have further inquiries regarding the quality of micro switches, feel free to reach out.

By methodically following these steps, you can assess whether a micro switch is defective or of inferior quality. Should any tests indicate failure, it is advisable to replace the switch. We can also assist you in evaluating various limit switches and micro switches. Please contact us.

For more information on manually operated switches, don't hesitate to get in touch with us.