Signal level too high

What does F13.7 mean?

The signal level from Encoder 1 is excessively high, exceeding the permitted limit during monitoring. This often points to an incorrect gear ratio configured for the resolver or a wiring issue, potentially leading to inaccurate position readings.

• Incorrect scaling factor or gear ratio (e.g., P6-03 Encoder scaling) configured in the drive, leading to an amplified signal interpretation.
• Short circuit between a signal line (e.g., A+) and the encoder's power supply (e.g., 24VDC) within the cable or encoder.
• Faulty Encoder 1 internal output stage producing an over-voltage signal.
• Incorrect termination resistance (e.g., P6-05 Encoder termination) causing signal reflections and voltage spikes.
• Ground loop issue causing a common-mode voltage offset to appear as a higher differential signal.

Click steps to track your progress.

1. 1

   Review the Encoder 1 scaling parameters (e.g., P6-03 Pulses per revolution) in the drive and compare with the encoder's datasheet.

2. 2

   Measure the peak voltage levels of Encoder 1's differential signals (e.g., A+ to A-, B+ to B-) at the drive's encoder input (e.g., X11) using an oscilloscope.

3. 3

   Check for any unintended shorts between signal lines and power or ground within the Encoder 1 cable or at the terminals.

4. 4

   Verify the correct termination resistance (e.g., P6-05) is applied in the drive's settings for the specific encoder type.

5. 5

   Ensure proper grounding of the encoder cable shield at the drive to prevent common-mode voltage buildup.