Resolver error at X7

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The resolver cable connected to X7 is interrupted, or the resolver itself is faulty. This prevents accurate motor position feedback, which is crucial for precise motor control.

• Open circuit or high resistance in the resolver excitation winding cable (e.g., X7/1 to X7/2), preventing excitation signal.
• Open circuit or short circuit in the resolver sine/cosine feedback windings cable (e.g., X7/3 to X7/4, X7/5 to X7/6), leading to no position signal.
• Damaged resolver sensor within the motor itself, often due to mechanical shock, overheating, or ingress of contaminants.
• Incorrect shielding or grounding of the resolver cable, leading to noise interference on the low-level sine/cosine signals.
• Loose or corroded connections at the X7 terminal block on the controller or at the resolver motor connector.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Power off the drive, disconnect the resolver cable from X7, and measure resistance across X7/1-X7/2 (excitation) and X7/3-X7/4, X7/5-X7/6 (feedback) for open circuits.

2. 2

   Using a multimeter, check for continuity of each individual wire in the resolver cable from end to end (connector to X7 terminals).

3. 3

   Inspect the resolver cable for cuts, kinks, or signs of crushing; replace the cable if physical damage is evident.

4. 4

   Verify the integrity of the cable shield connection at both the motor and the X7 connector on the controller.

5. 5

   With power on, use an oscilloscope to check for the presence and amplitude of the excitation signal on X7/1 and X7/2 terminals (typically 5-10V AC).

6. 6

   If possible, swap the resolver with a known good one (if available) to confirm if the resolver sensor or the drive input is at fault.