Escalator Motor Temperature Sensor MPD-A & MPD-C: Overheat Protection Core from Nanjing Zhuye Elevatorparts

Step-by-Step Usage Guide for Escalator Motor Temperature Sensor MPD-A & MPD-C

1. Professional Installation & Wiring

• Safety Preparation: Cut off the escalator’s main power supply and lock the power switch to prevent accidental power-on. Locate the designated temperature measurement point on the escalator motor (usually the motor winding or shell, as specified by the motor manufacturer) and clean the surface to remove dust, oil stains, and rust that may affect heat conduction.
• Sensor Installation: Fix MPD-A/MPD-C to the temperature measurement point using high-temperature resistant fixing clips or adhesive (provided by Nanjing Zhuye Elevatorparts). Ensure the sensor’s sensing surface is closely attached to the motor surface (no air gaps) to guarantee accurate temperature collection. For sensors installed in winding positions, follow the motor disassembly and assembly specifications to avoid damaging the motor windings.
• Wiring Operation: In accordance with the escalator control system wiring diagram, connect the sensor’s signal cables (two-wire or three-wire system, depending on the model) to the corresponding interfaces of the main controller. Ensure correct wiring polarity, tight terminal connections, and reliable insulation. Use high-temperature resistant cable ties to neatly fix the cables, avoiding contact with motor rotating parts or high-voltage components to reduce interference. Confirm that the sensor’s signal output type (analog or switch signal) matches the controller’s input requirements.
• Post-Installation Debugging: Restore the power supply and switch the escalator to inspection mode. Use a professional temperature calibrator to simulate different motor temperatures and check if the sensor’s output signal is consistent with the actual temperature. Set the safe temperature threshold (usually 90℃~110℃, adjustable according to motor specifications) through the controller and test the protective response: when the simulated temperature exceeds the threshold, confirm the controller can trigger the preset protective measures. Conduct a 1-hour continuous operation test to ensure the sensor signal remains stable.

2. Daily Operation & Routine Inspection

• Daily Visual Inspection: During escalator patrols, check the external condition of MPD-A/MPD-C. Ensure the sensor shell is free of deformation, cracks, or corrosion; the signal cables are intact without aging, wear, or loose connections; the fixing clips/adhesive are firm without loosening. Observe the escalator’s operation status through the control panel to confirm no abnormal temperature alarm signals are triggered.
• Weekly Performance Check: Use a multimeter to detect the sensor’s input voltage and signal output status, ensuring all parameters are within the standard range. Connect to the escalator controller’s self-test interface to verify the consistency between the sensor’s temperature data and the actual motor operating temperature. Record the test data for trend analysis and promptly troubleshoot any abnormal deviations.
• Monthly Cleaning & Calibration: Clean the sensor’s sensing surface and the attached motor area with a soft, dry cloth to remove dust and oil stains, ensuring good heat conduction. Use a professional temperature calibrator to calibrate the sensor’s measurement accuracy—adjust or replace the sensor if the deviation exceeds ±2℃. Check the tightness of wiring terminals and re-tighten if necessary.

Recommended Replacement Cycle for Escalator Motor Temperature Sensor MPD-A & MPD-C

1. Standard Replacement Cycle

2. Adjustments for Special Scenarios

• Harsh Environments & High-Traffic Scenarios: For escalators in high-temperature industrial areas, high-humidity coastal areas (salt spray corrosion), or high-traffic areas (e.g., airports, railway stations) with long daily operation hours (≥18 hours), the replacement cycle should be shortened to 2–3 years. Harsh conditions and heavy load operation accelerate sensor element aging, shell corrosion, and signal cable degradation.
• Low-Frequency Use Scenarios: For escalators with low usage frequency (e.g., office buildings, small shopping malls with daily operation time < 8 hours) and stable operating environments, the replacement cycle can be extended to 5–6 years—only if Nanjing Zhuye Elevatorparts’ professional technicians conduct an inspection and confirm that the sensor’s measurement accuracy, response speed, and signal stability are intact and consistent with original factory standards.

3. Immediate Replacement Conditions

• The sensor’s measurement deviation exceeds ±3℃ (confirmed by calibration), leading to frequent false temperature alarms or failure to alarm when the motor is overheated, and the fault persists after adjustment.
• The sensor has no signal output or intermittent signal transmission, and the fault is confirmed to be caused by internal element damage or cable breakage after professional testing.
• The sensor shell is severely damaged or corroded, losing the protection function, and the internal sensing element is contaminated or damaged (unrepairable).
• The sensor fails the performance test (e.g., response time > 5s, signal error rate > 5%), failing to meet the escalator motor’s overheat protection monitoring requirements.