230-0497

Access Drive Configuration in MOD

Power on in Service Mode, press MOD key, navigate to 'Drive System' or 'Motor Configuration' menu. Identify the axis/spindle and inverter/motor numbers from the alarm text.

Document existing settings before making changes. Incorrect motor parameters can cause dangerous motor behavior.

Verify Motor Nameplate Data

Check physical motor nameplate for rated voltage, current, power, pole pairs, and encoder type. Compare these values with the parameters in MOD > Motor Parameters for the affected motor number.

For synchronous motors, pay special attention to pole pair count - this is critical for commutation and often misconfigured during motor replacement.

Correct Motor Configuration Parameters

In MOD function, enter correct values for motor type, rated current, rated voltage, pole pairs, encoder type, and thermal monitoring parameters to match motor nameplate.

Heidenhain motors typically have configuration data on a label or in documentation - use exact values rather than estimating.

Save Configuration and Test

Save the corrected motor parameters in MOD, perform a complete controller restart (power cycle), and verify alarm clears. Test axis motion at low feedrate (10%) initially.

Identify Inverter Module Hardware

Open drive cabinet and locate the inverter module corresponding to the alarm parameter %2. Record the module type number from the hardware label (e.g., UM 122, UM 123 series).

Ensure machine power is locked out and drives are discharged before opening cabinet. Wait 5 minutes after power-off for DC bus capacitors to discharge.

Check Configured Inverter Type in MOD

In MOD function, navigate to Drive Configuration > Inverter Settings. Verify the configured inverter type and current rating match the physical module identified in the cabinet.

The inverter number in the alarm may not match the slot position - check the drive assignment table in MOD to correlate logical to physical addresses.

Verify Current Rating Compatibility

Compare the inverter's continuous current rating with the motor's rated current from nameplate. Inverter must be rated at least 100% of motor rated current, preferably 110-120% for dynamic applications.

Check both continuous and peak current ratings - some motors have high peak-to-rated ratios that require oversized inverters.

Reconfigure or Replace Inverter

If inverter type is misconfigured in MOD, correct it to match physical hardware. If inverter is undersized or wrong type, replace with correct module and update configuration accordingly.

After inverter replacement, perform complete motor auto-configuration to ensure proper parameter detection.

Trace Motor Power Cables

Using the alarm parameters, identify which axis/spindle (%1) and motor number (%3) are involved. Trace the motor power cables from the inverter output terminals to the actual motor on the machine.

Perform this check with power locked out. Do not disconnect cables while drives are powered.

Verify Motor-to-Axis Assignment

Check the motor nameplate and machine documentation to confirm this motor should be driven by this specific inverter output. Look for axis labels on both motors and inverter terminal blocks.

After cable work or motor replacement, it's common for X and Y axes to be swapped if motors are similar types. Check feedback cables too - they should match power cable routing.

Correct Cable Connections

If wrong motor is connected to this inverter, power down completely, swap motor power cables to correct inverter outputs, ensuring proper phase sequence (U-V-W) and PE ground connections.

Verify cable ratings are adequate for the motor current. Check for damage during re-routing. Torque all terminals to specification.

Verify Encoder Cable Assignment

Ensure encoder feedback cables also match the corrected motor assignments. Check encoder connections in MOD > Encoder Configuration match the physical routing.

The control may generate multiple alarms if both power and feedback are mismatched - resolve this alarm first, then address any encoder-related alarms.