Quadrant check

What does F14.9 mean?

An error was detected during the quadrant check for the sine encoder (Encoder 2), indicating a problem with signal integrity or phase relationship. This can be caused by wiring issues, EMC interference, or a defective encoder, leading to incorrect position feedback.

• Phase shift error between the sine and cosine signals from Encoder 2, deviating significantly from the ideal 90-degree relationship.
• Crosstalk between the Sin/Cos signal pairs within the Encoder 2 cable due to damaged insulation or improper cable construction.
• Drive input card X2 malfunction, incorrectly processing the quadrature relationship of the incoming Sin/Cos signals.
• External electromagnetic interference (EMI) causing transient distortion of either the sine or cosine signal from Encoder 2.
• Internal damage to Encoder 2's optical grid or magnetic pole structure, leading to irregular signal generation.

Click steps to track your progress.

1. 1

   Using a dual-trace oscilloscope, display the differential Sin+ to Sin- and Cos+ to Cos- signals from Encoder 2 simultaneously at terminal X2 and measure their phase relationship.

2. 2

   Inspect the Encoder 2 cable for any signs of pinching, crushing, or damage to the internal insulation that could cause crosstalk.

3. 3

   Power down the drive and measure the insulation resistance between the Sin+ and Cos+ lines (and their respective - lines) in the Encoder 2 cable.

4. 4

   Temporarily swap Encoder 2 with a known-good, identical encoder to determine if the fault is encoder-specific.

5. 5

   Verify the encoder type and signal processing parameters (e.g., P3-50) in the drive are correctly configured for a sine encoder.