Mitsubishi FR-A800 Error Code E.OHT

Mitsubishi PLC & VFD Major Overtemperature

Model: FR-A800 | Code: E.OHT

Applicable Systems
MELSEC FX3U MELSEC FX5U FR-A800 FR-A700 MR-J4 iQ-R Motion Controller (R32MTCPU/R16MTCPU)

Symptoms

External thermal relay tripped.

Possible Causes

  • External thermal relay activated
  • Motor overload
  • Thermal relay setting too low

Troubleshooting Steps

  1. Step 1: Check thermal relay setting
    Setting matches motor rated current
  2. Step 2: Verify motor load
    Current within rated range
  3. Step 3: Reset thermal relay
    Relay resets

How to Reset

Reset via parameter unit after thermal relay is reset.

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Source: Mitsubishi FR-A800 Instruction Manual, Mitsubishi Electric

Category: PLC & VFD