Rexroth IndraDrive HCS Error Code F8064

Rexroth PLC & VFD Major Hardware

Model: IndraDrive HCS | Code: F8064

Applicable Systems
EFC FEX FEI HNC

Symptoms

Motor phase loss detected. The drive senses that one of the three output phases (U, V, or W) is not carrying current. The motor may hum, vibrate, or fail to start.

Possible Causes

  • Motor winding open circuit in one phase
  • Output cable broken or loose connection at drive or motor terminal
  • Drive output phase IGBT not switching
  • Motor terminal box loose connection

Troubleshooting Steps

  1. Step 1: Check all motor cable connections at drive output terminals U, V, W
    All terminals torqued to specification; no loose connections
  2. Step 2: Measure continuity of each motor cable conductor
    All three phases show continuity end-to-end
  3. Step 3: Measure motor winding resistance for all three phase pairs (U-V, V-W, U-W)
    All three readings should be approximately equal (within 5%)
  4. Step 4: If motor and cable are good, the drive output stage has a failed IGBT and must be replaced
    Replacement drive runs motor normally

How to Reset

1) Power off and disconnect motor cables. 2) Check all terminal connections. 3) Megger test motor windings. 4) Check cable continuity. 5) Replace drive if motor/cable are good. Caution: Running a 3-phase motor with a missing phase can damage the motor.

Frequently Asked Questions

  • Q: Will F8064 damage the motor?

    Prolonged operation with a missing phase can cause motor overheating and winding damage. Address the fault immediately.

  • Q: How do I know which phase is missing?

    Use a clamp meter to measure current on each of the three output phases. The phase with zero or very low current is the one with the open circuit.

Related Rexroth Fault Codes

Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG

Category: PLC & VFD