231-E032

Check X70 connector wiring

Inspect X70 connector on CC power supply unit for loose connections, damaged pins, or corrosion. Verify all pins are properly seated.

Power down system completely before inspecting connectors

Measure safety enable signals

Using multimeter, check for 24VDC on safety enable pins at X70 connector. Verify continuity from safety relay outputs to X70 pins.

Check TNC parameter 128200 EMERGENCY_STOP for proper safety chain configuration

Verify safety relay operation

Test safety relay K1 operation by cycling emergency stop circuit. Monitor relay contacts with multimeter during operation.

Use TNC diagnostic screen MOD > DIAGNOSIS > DRIVE to monitor safety signals in real-time

Measure KDR resistance

Disconnect KDR from power supply and measure resistance across reactor windings. Should read low ohms, not zero or infinite resistance.

Ensure all power is off and capacitors discharged before disconnecting KDR

Check KDR connections

Inspect KDR terminal connections for overheating, discoloration, or loose hardware. Verify torque specifications per Heidenhain documentation.

Look for burn marks or melted insulation indicating thermal damage from short circuit

Test insulation resistance

Use megohmmeter to test insulation resistance between KDR windings and ground. Should read >1 megohm at 500VDC test voltage.

Perform insulation test at multiple voltage levels to identify partial breakdown

Verify KDR wiring diagram

Compare actual KDR connections against Heidenhain electrical schematic for your specific CC power supply model. Check phase sequence and polarity.

KDR wiring varies between single-axis and multi-axis CC configurations

Check DC bus connections

Verify KDR is connected between DC bus positive and motor output phases. Ensure proper gauge wire and torque specifications are used.

DC bus voltages can exceed 600VDC - use appropriate PPE and test equipment

Validate current path

Trace current path from power supply through KDR to motor connections. Verify no parallel paths or incorrect jumpers are present.

Use TNC parameter 114000 series to verify motor connection configuration matches actual wiring

Check power supply LEDs

Observe status LEDs on CC power supply front panel. Red LED indicates fault condition, green LED should be steady when ready.

Blinking LED patterns indicate specific fault codes - consult CC manual for interpretation

Measure DC bus voltage

Check DC bus voltage at power supply output terminals. Should read approximately 1.35 times AC input voltage when ready.

High voltage present - use CAT III rated meter and appropriate safety procedures

Test RDY.PS signal output

Measure RDY.PS signal at power supply control connector. Should read 24VDC when unit is ready for operation.

If all other checks pass but RDY.PS remains low, internal control board likely requires replacement