Elevator Parts Limit Switch HD/1370: Critical Safety Protection Core from Nanjing Zhuye Elevatorparts

Step-by-Step Usage Guide for Elevator Parts Limit Switch HD/1370

1. Professional Installation & Commissioning

• Safety Preparation: Cut off the elevator’s main power supply and hang a “Maintenance in Progress—Do Not Power On” sign at the power switch. Fix the elevator car to a safe position (middle of the shaft) using a safety clamp. Locate the preset installation positions for the upper and lower limit switches (usually on the elevator guide rail near the top and bottom floors) and clean the area to remove dust, oil stains, and debris.
• Switch Installation: Fix the HD/1370 limit switch to the guide rail mounting bracket using high-strength bolts provided by Nanjing Zhuye Elevatorparts. Ensure the switch’s trigger lever is aligned with the collision block on the elevator car—adjust the installation height to ensure the trigger lever is activated when the car reaches the preset limit position (trigger gap: 2–5mm). Tighten the bolts with a torque of 18–22 N·m to prevent loosening due to elevator vibration.
• Wiring & Calibration: Connect the HD/1370’s power terminal and signal terminal to the elevator main control system according to the wiring diagram and Nanjing Zhuye’s technical guidance. Ensure correct polarity, tight wiring, and use waterproof sleeves for wiring connections in humid areas. After wiring, calibrate the trigger position: operate the elevator in inspection mode to move the car up and down, confirm the limit switch is triggered accurately when the car reaches the upper/lower limit, and the main control system immediately receives the stop signal.
• Post-Installation Testing: Restore the power supply and conduct comprehensive functional tests. Simulate normal operation and overtravel scenarios (in a safe manner) to verify the limit switch’s response sensitivity (trigger response time ≤ 0.2s). Check if the elevator stops immediately without overshoot when the switch is triggered. Test the switch’s reset function—confirm it resets automatically after the car moves away from the limit position. If there is delayed trigger, failure to stop, or failure to reset, recheck the installation position and wiring immediately.

2. Daily Operation & Routine Inspection

• Daily Visual Inspection: During shaft patrols, check the external state of the HD/1370 limit switch. Ensure the sealed shell is free of cracks, deformation, or damage; the trigger lever is intact with no bending or wear; the wiring terminals are tight with no loose wires or corrosion.
• Weekly Functional Check: Operate the elevator in inspection mode to move the car to the upper and lower limit positions, verify the limit switch is triggered normally and the elevator stops immediately. Manually press the trigger lever to test the contact switch’s sensitivity—ensure it makes and breaks contact smoothly with no jamming. After the test, confirm the switch resets to the standby state.
• Monthly Parameter Monitoring: Use a multimeter to detect the limit switch’s input voltage (ensure it is within the standard range of AC 220V ± 10V or DC 24V ± 1V, depending on the model) and contact resistance. Check the mounting bolts for looseness and retighten if necessary. For switches installed in harsh environments, check the shell for corrosion and clean the trigger lever with a dry cloth.

3. Regular Maintenance Schedule

• Quarterly Maintenance: Disconnect the power supply, remove the limit switch’s protective cover, and clean the trigger lever and contact points with a professional cleaner (provided by Nanjing Zhuye Elevatorparts). Apply a small amount of contact lubricant to the trigger mechanism 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 trigger accuracy, contact reliability, and mechanical flexibility. Use a professional position tester to verify the trigger position deviation (≤ 1mm). For elevators in high-traffic areas or harsh shaft environments (high humidity, dust, or temperature fluctuations), increase the test frequency and check the collision block on the car for wear.
• Annual Professional Overhaul: Arrange a professional inspection with Nanjing Zhuye Elevatorparts’ certified technical team. Disassemble the HD/1370 limit switch (by professional personnel) to inspect internal components (such as springs and contacts) for aging or damage. Replace worn components with genuine HD/1370 parts. Conduct a full-range calibration of the switch’s trigger position and signal transmission to meet the original factory safety standards.

Recommended Replacement Cycle for Elevator Parts Limit Switch HD/1370

1. Standard Replacement Cycle

2. Adjustments for Special Scenarios

• Harsh Environments: For elevators in high-humidity coastal areas (salt spray corrosion), high-dust construction sites, or elevators with frequent overtravel trigger (due to improper operation), the replacement cycle should be shortened to 2–4 years. Harsh conditions accelerate the corrosion of the shell, wear of the trigger mechanism, and failure of the contact switch, significantly reducing the limit 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 clean, stable shaft environments, the replacement cycle can be extended to 6–8 years—only if Nanjing Zhuye’s professional inspection confirms that the trigger accuracy, contact reliability, and mechanical performance are all intact.

3. Immediate Replacement Conditions

• The trigger lever 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 the stop signal.
• 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 trigger position deviation exceeds 3mm, and adjustment fails to restore normal accuracy; the switch’s response time exceeds 0.5s, affecting emergency stop performance.