231-C1D0

Access Machine Parameters

Navigate to MOD function, select Machine Parameters, enter password level 2 (OEM access).

Incorrect parameter changes can damage drives - document original values before modification

Check Power Module Configuration

Review MP7210 (power module type), MP7211 (rated current), MP7212 (current sensor scaling) for correct values matching your specific power module model.

Cross-reference values with power module nameplate data and Heidenhain documentation

Verify Current Sensor Parameters

Check MP7215 (current sensor offset) and MP7216 (current sensor gain) match factory specifications for your power module variant.

Reset and Test

Save parameters, perform PLC reset via MP7085, and monitor current sensor voltages in diagnostic display MP7800-MP7807.

Check Current Sensor Voltages

Access diagnostic display via MOD > Diagnosis > Drive diagnosis, monitor real-time current sensor voltages (typically 2.5V ±2.5V range).

Healthy sensors show stable voltage around 2.5V at zero current

Perform Static Voltage Test

With drives disabled, verify all current sensor outputs read approximately 2.5V DC. Readings significantly outside 2.0-3.0V indicate sensor failure.

Test Sensor Response

Enable drives and observe voltage changes during small axis movements. Sensors should show proportional voltage changes with current flow.

Replace Power Module

If sensor voltages are erratic or stuck at rail voltages (0V or 5V), replace the entire power module assembly.

Power down completely and wait 5 minutes for capacitor discharge before replacement

Check Supply Voltages

Measure +15V and -15V analog supply voltages at power module test points, verify within ±5% tolerance.

Use true RMS meter and check for AC ripple - should be less than 100mV peak-to-peak

Verify 5V Digital Supply

Check 5V digital supply feeding current sensor reference circuits, must be stable within ±2% (4.9V to 5.1V).

Inspect Power Connections

Check all power module connector contacts for corrosion, loose connections, or damaged pins affecting supply voltage stability.

Test Under Load

Monitor supply voltages during axis movement to identify voltage drops under load conditions that could affect sensor accuracy.

Check Grounding System

Verify cabinet ground integrity, ensure power module chassis ground resistance to earth ground is less than 0.1 ohms.

Inspect Cable Shielding

Examine encoder and motor cable shield connections, ensure 360-degree shield termination at both ends with proper EMC cable glands.

Identify Interference Sources

Use oscilloscope to monitor current sensor voltages for high-frequency noise, check for correlation with nearby equipment operation.

Temporarily disconnect suspect equipment to isolate interference sources

Implement Noise Suppression

Add ferrite cores to affected cables, verify proper separation between power and signal cables, check for damaged cable shields.