Applicable Systems
WJ200
Symptoms
Hitachi UAGX elevator controller reports fault during normal operation indicating control system or sensor issue affecting safe elevator operation.
Possible Causes
- Door zone sensor signal loss preventing accurate floor leveling
- Motor thermistor open circuit indicating motor overheating
- Safety chain input signal interruption during door operation
- Position encoder signal degradation causing leveling error
Troubleshooting Steps
- Step 1: Access the UAGX controller diagnostic screen via maintenance panel
Fault code, time, and floor position displayed - Step 2: Check door zone sensor operation with slow-speed test
Door zone signal transitions correctly at each floor - Step 3: Verify motor thermistor resistance at motor terminal box
Thermistor resistance within 200-500 ohm range at ambient temperature - Step 4: Run position encoder self-test from controller menu
Encoder pulse count matches expected value for travel distance
How to Reset
Reset by: 1) Investigate and correct the fault condition. 2) Execute controller reset from maintenance mode. 3) Perform slow-speed verification run. 4) Confirm normal operation before returning to service.
Common Replacement Parts
- UAGX-CTL-01: Hitachi UAGX controller board (Verify software version compatibility)
Frequently Asked Questions
- Q: How often should the door zone sensors be calibrated?
Door zone sensors should be calibrated during annual maintenance or whenever the elevator rope length is adjusted. Use the UAGX sensor calibration procedure in the maintenance manual.
Source: Hitachi UAGX Elevator Controller Manual
Category: Elevator