231-C160

Access Motor Parameters

Navigate to MOD function → Machine Parameters → Motor Parameters and locate the affected axis motor encoder settings.

Document current parameters before making changes for easy rollback if needed.

Verify Encoder Specifications

Check the motor encoder nameplate or documentation for the correct grating period specification and compare with parameter settings.

Ensure machine is in safe state before accessing motor components.

Update Motor Table Entry

Correct the motor encoder grating period parameter to match the actual encoder specification and save the machine parameters.

Use the encoder manufacturer's datasheet for exact specifications rather than estimating values.

Perform Reference Run

Execute a reference point approach to verify the corrected parameters resolve the alarm condition.

Check Encoder Signals

Use TNC diagnostic functions to monitor motor encoder signal quality and amplitude in the Position Values/Encoder Status display.

Look for signal amplitude variations or noise that indicate connection problems.

Inspect Encoder Connections

Examine motor encoder cable connections at both the motor and drive amplifier ends for loose connections, corrosion, or damage.

Power down the system before inspecting electrical connections.

Clean Encoder Components

Clean the encoder disk/scale and reading head of any contamination using appropriate cleaning materials for the encoder type.

Use lint-free cloths and approved solvents to avoid damaging sensitive encoder components.

Test Signal Integrity

Verify encoder signal quality has improved by monitoring the diagnostic displays during slow axis movement.

Perform Encoder Diagnostics

Use TNC encoder test functions to evaluate motor encoder performance and identify specific failure modes.

Compare encoder behavior across different speed ranges to isolate mechanical vs. electronic issues.

Check Encoder Mounting

Inspect motor encoder mounting for mechanical looseness, misalignment, or excessive runout that could affect signal generation.

Ensure proper lockout/tagout procedures before accessing rotating machinery.

Measure Encoder Signals

Use oscilloscope to measure encoder output signals directly at the encoder connector to verify signal integrity and proper phase relationships.

Compare measured signals against encoder manufacturer specifications for amplitude and frequency response.

Replace Encoder if Defective

If diagnostics confirm encoder failure, replace the motor encoder with identical specification unit and update motor parameters if necessary.

Check Drive Parameters

Verify drive amplifier encoder interface parameters match the motor encoder specifications using the drive's parameter setting interface.

Cross-reference drive encoder parameters with TNC motor table settings for consistency.

Inspect Drive Connections

Examine encoder signal connections at the drive amplifier input terminals for proper wiring and secure connections.

Verify drive power is off before inspecting terminal connections.

Test Drive Encoder Interface

Use drive diagnostic functions to test encoder interface operation and signal processing capabilities.

Monitor drive encoder fault registers for additional diagnostic information.

Update Drive Configuration

Correct any drive parameter mismatches and perform drive initialization sequence to establish proper encoder communication.

Backup Current Configuration

Create backup of current TNC machine parameters and configuration using the data backup function before making changes.

Include date and alarm code in backup filename for future reference.

Restore Default Parameters

Load known good machine parameter set or restore from previous backup to eliminate configuration-related causes.

Ensure parameter set matches current hardware configuration to prevent additional alarms.

Verify System Configuration

Check TNC system configuration matches actual hardware setup including encoder types, drive models, and interface connections.

Use machine documentation to verify all configuration parameters are correctly set.

Perform System Initialization

Execute complete TNC initialization sequence to establish proper communication with all motor encoders and drives.