Signal level too low

What does F14.6 mean?

The signal level from Encoder 2 is too low, falling below the permitted limit during monitoring. This indicates a problem with the wiring, external electromagnetic interference (EMC), or a faulty encoder, leading to unreliable position feedback.

• Degradation or damage to the Encoder 2 signal cables (e.g., incremental A/B/Z signals or Sin/Cos signals) leading to increased resistance or partial open circuits.
• Inadequate shielding of the Encoder 2 cable, allowing external electromagnetic interference (EMI) to attenuate the signal.
• Internal failure of the Encoder 2 output driver circuitry, resulting in reduced signal amplitude.
• Incorrect termination resistance (P3-60) for the encoder signals on the drive input card X2, leading to signal reflection and attenuation.
• Loose connection at the Encoder 2 connector or at the drive's input terminal X2 causing poor contact.

Click steps to track your progress.

1. 1

   Measure the differential voltage of the Encoder 2 signals (e.g., A+ to A-, B+ to B-) at drive terminal X2 using an oscilloscope, observing peak-to-peak amplitude.

2. 2

   Inspect the entire length of the Encoder 2 cable for cuts, abrasions, or crushed sections, focusing on the signal conductors.

3. 3

   Verify the encoder cable shielding is properly terminated at both the encoder and drive ends (grounded).

4. 4

   Check drive parameter P3-60 (Encoder 2 termination resistance) and adjust according to the encoder's specified output characteristics.

5. 5

   Clean and re-seat the Encoder 2 cable connector at both the encoder and drive input terminal X2.