Elevator Speed Governor Switch EL-1375/S3-1375: Over-Speed Protection Core from Nanjing Zhuye Elevatorparts

Step-by-Step Usage Guide for Elevator Speed Governor Switch EL-1375/S3-1375

1. Professional Installation & Commissioning

• Safety Preparation: Cut off the elevator’s main power supply and the power supply of the speed governor system, and hang a “Maintenance in Progress—Do Not Power On” sign at the power switch. Locate the speed governor (usually installed in the machine room) and clean the installation area to remove dust, oil stains, and debris that may affect installation accuracy.
• Switch Installation: Fix the EL-1375/S3-1375 speed governor switch to the speed governor’s mounting bracket using high-strength bolts provided by Nanjing Zhuye Elevatorparts. Ensure the switch’s trigger pin is accurately aligned with the speed governor’s centrifugal hammer—adjust the installation gap to ensure the trigger pin is activated when the speed governor reaches the preset over-speed threshold (standard gap: 1–3mm). Tighten the bolts with a torque of 15–18 N·m to prevent loosening due to machine room vibration.
• Wiring & Calibration: Connect the switch’s power terminal and signal terminal to the elevator main control system and safety gear circuit according to the wiring diagram and Nanjing Zhuye’s technical guidance. Ensure correct polarity, tight wiring, and use flame-retardant wire sleeves for wiring connections. After wiring, calibrate the speed-sensing parameters: use a professional speed tester to simulate the elevator’s over-speed state, confirm the switch is triggered accurately when the speed reaches 115% of the rated speed (pre-alarm) and 125% of the rated speed (emergency stop), and the main control system immediately executes corresponding protective measures.
• Post-Installation Testing: Restore the power supply and conduct comprehensive functional tests. Operate the elevator at normal speed, inspection speed, and simulate over-speed scenarios (in a safe manner) to verify the switch’s response time (≤ 0.1s). Check if the safety gear is activated normally when the switch triggers the emergency stop signal. Test the switch’s reset function—confirm it resets automatically after the speed governor returns to normal speed. If there is delayed trigger, false alarm, or failure to reset, recheck the installation gap and wiring immediately.

2. Daily Operation & Routine Inspection

• Daily Visual Inspection: During machine room patrols, check the external state of the EL-1375/S3-1375 switch. Ensure the sealed shell is free of cracks, deformation, or damage; the trigger pin is intact with no bending or wear; the wiring terminals are tight with no loose wires or corrosion.
• Weekly Functional Check: Manually rotate the speed governor to simulate over-speed, verify the switch’s trigger sensitivity and signal transmission. Check the switch’s indicator light (green for normal, yellow for pre-alarm, red for emergency stop) to ensure it displays correctly. After the test, confirm the switch and speed governor reset to the standby state.
• Monthly Parameter Monitoring: Use a multimeter to detect the switch’s input voltage (ensure it is within the standard range of DC 24V ± 1V) and contact resistance. Check the mounting bolts for looseness and retighten if necessary. Clean the switch’s trigger pin and speed governor’s centrifugal hammer with a dry cloth to remove dust and oil stains.

3. Regular Maintenance Schedule

• Quarterly Maintenance: Disconnect the power supply, remove the switch’s protective cover, and clean the trigger mechanism and contact points with a professional cleaner (provided by Nanjing Zhuye Elevatorparts). Apply a small amount of high-temperature resistant lubricant to the trigger pin to ensure smooth operation. Check the internal wiring for aging or damage and replace it if necessary.
• Semi-Annual Performance Test: Conduct a comprehensive performance test, including speed-sensing accuracy, contact reliability, and mechanical flexibility. Use a professional speed governor tester to verify the switch’s trigger speed deviation (≤ 2% of the standard threshold). For elevators in harsh environments (high temperature, high humidity, or dusty machine rooms), increase the test frequency and check the speed governor’s lubrication status.
• Annual Professional Overhaul: Arrange a professional inspection with Nanjing Zhuye Elevatorparts’ certified technical team. Disassemble the EL-1375/S3-1375 switch (by professional personnel) to inspect internal components (such as springs, contacts, and centrifugal parts) for aging or damage. Replace worn components with genuine parts. Conduct a full-range calibration of the switch’s trigger threshold and signal transmission to meet the original factory safety standards.

Recommended Replacement Cycle for Elevator Speed Governor Switch EL-1375/S3-1375

1. Standard Replacement Cycle

2. Adjustments for Special Scenarios

• Harsh Environments: For elevators in high-temperature machine rooms (temperature > 40℃ for a long time), high-humidity coastal areas (salt spray corrosion), or dusty construction site elevators, the replacement cycle should be shortened to 3–5 years. Harsh conditions accelerate the aging of internal components, corrosion of the shell, and failure of the trigger mechanism, significantly reducing the switch’s reliability.
• Low-Frequency Use Scenarios: For elevators with low usage frequency (e.g., villa elevators, small office buildings with daily operation time< 8 hours) and well-maintained machine rooms, the replacement cycle can be extended to 7–8 years—only if Nanjing Zhuye’s professional inspection confirms that the speed-sensing accuracy, contact reliability, and mechanical performance are all intact.

3. Immediate Replacement Conditions

• The trigger pin is severely worn, bent, or broken; the switch fails to trigger or reset automatically, and the fault cannot be eliminated through maintenance.
• The contact switch has poor contact or is stuck, leading to intermittent signal transmission or failure to send over-speed protection signals.
• The shell is severely cracked or damaged, exposing internal components to dust and moisture; the internal circuit is short-circuited or broken (confirmed by professional testing).
• The speed-sensing deviation exceeds 5% of the standard threshold, and adjustment fails to restore normal accuracy; the switch’s response time exceeds 0.3s, affecting emergency protection performance.