UCMP (unintended car movement) abnormal

Hitachi Elevator Critical Elevator

Model: MCA | Code: 30

Applicable Systems
WJ200

Symptoms

Unintended car movement protection (UCMP) activated

Possible Causes

  • Car moved unexpectedly with doors open
  • UCMP sensor detected movement
  • brake slip

Troubleshooting Steps

  1. Step 1: Check brake function
    Verify the fault is resolved after completing this step.
  2. Step 2: verify UCMP sensors
    Verify the fault is resolved after completing this step.
  3. Step 3: inspect for mechanical slippage
    Verify the fault is resolved after completing this step.

How to Reset

Power cycle; resolve UCMP trigger cause

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Category: Elevator