Resolver fault

What does Sd2 mean?

This fault indicates a problem with the resolver feedback device, which provides position and speed information to the drive. This could be due to wiring issues, a faulty resolver, or mechanical damage. By default, this critical condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal, as precise resolver feedback is crucial for motor control. Manual reset is required.

• Open circuit or short circuit in the resolver excitation (R1/R2) or feedback (S1/S2/S3/S4) wiring.
• Damage to the resolver itself, such as a fractured winding or bearing failure causing mechanical misalignment.
• Incorrect wiring sequence for the resolver phases (e.g., S1/S3 swapped, S2/S4 swapped at terminal X6).
• Degradation of insulation on resolver cables due to heat or abrasion, leading to inter-wire shorts.
• Faulty resolver interface card or input stage on the drive.

Click steps to track your progress.

1. 1

   Power off the drive and disconnect the resolver cable at the drive's resolver input (e.g., terminal X6).

2. 2

   Measure winding resistance for both the primary (excitation) and secondary (feedback) windings of the resolver using a multimeter. Compare values to manufacturer specifications.

3. 3

   Check continuity of all conductors and shield within the resolver cable from the resolver to drive terminal X6.

4. 4

   Verify resolver excitation voltage and frequency from the drive (e.g., using an oscilloscope on R1/R2 terminals) when power is applied.

5. 5

   Inspect the resolver for physical damage, shaft play, or signs of overheating on the resolver housing.