231-8A60

Check Encoder Cable Connections

Verify all connections at encoder head and drive amplifier. Check for loose D-sub connectors on encoder cable.

Power down axis drive before disconnecting encoder cables

Monitor Encoder Signals in Drive Diagnostics

Access drive diagnostic screen and observe commutation signal quality. Look for erratic sine/cosine waveforms or missing signals.

Healthy commutation signals should show clean 90-degree phase-shifted sine waves

Test Encoder Cable Continuity

Use multimeter to check continuity of encoder cable conductors, especially commutation signal lines and shield connections.

Pay special attention to cable routing through drag chains where flexing can cause intermittent breaks

Verify Motor Type Parameter

Check drive parameter for motor type matches installed motor. Verify pole count and motor constant settings.

Motor nameplate data must exactly match drive configuration parameters

Confirm Encoder Resolution Settings

Validate encoder lines per revolution parameter matches actual encoder specification. Check both position and commutation encoder settings if separate.

Incorrect encoder resolution can cause severe positioning errors

Review Commutation Offset Parameters

Check if commutation offset angle parameter is within acceptable range. Reset to default if corrupted.

Some drives require commutation offset learning procedure after parameter changes

Inspect Encoder for Physical Damage

Remove encoder cover and examine optical disc for scratches, contamination, or cracks. Check LED brightness and photodiode alignment.

Handle encoder disc carefully to avoid fingerprints or scratches on optical surfaces

Clean Encoder Optical Components

Use lint-free cloth and appropriate optical cleaner to clean encoder disc and sensor components. Ensure no residue remains.

Use compressed air to remove debris before wet cleaning

Check Encoder Mounting and Coupling

Verify encoder is securely mounted and coupling to motor shaft is tight. Look for signs of mechanical wear or misalignment.

Slight encoder misalignment can cause commutation signal distortion

Perform Drive Self-Diagnostics

Execute built-in drive diagnostic routines to test internal encoder processing circuits and identify failed components.

Document all diagnostic results before contacting technical support

Check Drive Power Supply Voltages

Measure all internal power supply voltages to encoder processing circuits. Verify they are within specification.

Use proper safety procedures when measuring voltages in live drive equipment

Test with Known Good Encoder

Temporarily connect a verified working encoder to isolate whether fault is in drive or encoder system.

Use encoder with identical specifications to avoid parameter conflicts