231-E130

Access current control parameters

Navigate to MOD function → Machine Parameters → Axis-specific parameters → Current control settings for the affected axis.

Document original parameter values before making changes

Check MP1020 current control parameters

Verify MP1020.x (current controller gain) and MP1021.x (current controller time constant) are within manufacturer specifications for your motor type.

Incorrect current control settings can damage servo motors

Perform current control optimization

Execute the automatic current control adjustment via Setup → Servo → Current Control → Auto Adjustment for the affected axis.

Ensure motor is at operating temperature before optimization

Verify test current measurement

Run safety self-test via Diagnosis → Servo → Safety Test to confirm test current now meets minimum threshold requirements.

Check drive enable status

Navigate to Diagnosis → Servo → Drive Status and verify PWM Enable signal is active for the affected axis during operation.

Never bypass safety enable circuits

Verify MP1000 enable configuration

Check MP1000.x (drive enable configuration) ensures proper PWM enabling sequence and timing for the servo amplifier.

Compare settings with working axes on the same machine

Inspect enable signal wiring

Check X31 connector pins for drive enable signals between TNC and CC unit, verify continuity and proper voltage levels (typically 24VDC).

Use oscilloscope to verify enable signal timing during self-test

Test PWM output functionality

Use Diagnosis → Servo → PWM Test function to manually verify PWM output stage responds correctly to enable commands.

Access current sensor diagnostics

Navigate to Diagnosis → Servo → Current Sensors and check real-time current measurement values for the affected axis.

Compare readings between phases - they should be balanced during normal operation

Perform current sensor calibration

Execute Setup → Servo → Sensor Calibration → Current Sensors to recalibrate the current measurement system in the CC unit.

Motor must be stationary and cool during calibration

Check sensor reference voltages

Measure reference voltages at current sensor circuits (typically ±15VDC) using multimeter at designated test points on CC unit.

Sensor drift often occurs gradually - check calibration dates in system logs

Verify sensor signal integrity

Use oscilloscope to examine current sensor output signals during controlled motor movement to identify noise or offset issues.

Inspect motor cable connections

Check all connections at motor junction box and CC unit X41 connector for tightness, corrosion, or damage.

Disconnect power and wait for capacitor discharge before inspecting connections

Measure cable resistance

Use milliohm meter to measure motor cable resistance between CC unit and motor terminals - should be less than specified values in motor documentation.

Temperature affects resistance measurements - take readings at consistent ambient temperature

Check motor winding resistance

Measure motor phase-to-phase resistance at motor terminals to verify windings are not damaged or degraded.

Compare measurements with motor nameplate specifications or previous service records