Encoder Disconnection Error

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This fault is detected if the motor's actual rotation speed (feedback from the encoder) remains below the 'Starting Frequency' (b082) for a duration longer than the 'Encoder Disconnection Detection Time' (P077), while the output frequency is at or above 'Creep Speed Setting' (P015). This suggests a disconnection or malfunction of the encoder, or incorrect detection settings.

• Physical disconnection of the encoder cable from the motor or inverter terminal (e.g., terminal X2).
• Broken wires within the encoder cable (e.g., A/B/Z phase signals, 5VDC or 12VDC supply).
• Encoder power supply failure (e.g., inverter's internal 5VDC or 12VDC encoder supply is overloaded or shorted).
• Faulty encoder unit on the motor shaft, not generating pulses despite motor rotation.
• Incorrect 'Starting Frequency' (b082) or 'Encoder Disconnection Detection Time' (P2-06) parameters set too aggressively.

Klikk på steg for å spore fremgangen.

1. 1

   1. Power off the inverter, disconnect the encoder cable at both ends, and perform a continuity test on all wires (e.g., A+, A-, B+, B-, Z+, Z-, 5V+, GND).

2. 2

   2. Measure the encoder supply voltage (e.g., +5VDC or +12VDC) at the inverter's encoder terminal block (e.g., X2 pins 1 and 2).

3. 3

   3. Verify parameter b082 (Starting Frequency) and P2-06 (Encoder Disconnection Detection Time) are set appropriately for the application.

4. 4

   4. With the motor rotating slowly (if safe), use an oscilloscope to check for pulse signals (A/B phases) at the encoder output terminals.

5. 5

   5. Inspect the encoder mounting for looseness or damage, ensuring the encoder shaft coupling is intact and rotating with the motor shaft.

6. 6

   6. If all checks pass, replace the encoder unit on the motor as it may have failed internally.