The limit switch is the basic component in the machining center electrical system. Since the machining center is working with the "high speed" to press the limit switch, the limit switch is a wearing part with a high failure rate. In the years of maintenance practice, the author found that the following faults often occur in the limit switch: 1. The machine has an “overtravel†alarm fault phenomenon: when the machine performs the reference point return action, the “overtravel†alarm occurs when there is no deceleration. This is a common fault, one
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