On Mitsubishi drives, I encountered alarm 3D which was resolved by increasing input power capacity. However, I also need to understand the troubleshooting steps for alarm 52 across different Mitsubishi drive models (MDS-E, MDS-C, and M70/M700/M800/M80 Series CNCs), as it has been indicated as 'Excessive Error 1' or 'Battery fault' depending on the model.

For Mitsubishi MDS-E drives, alarm 52 indicates 'Excessive Error 1'. To resolve this, check and adjust the excessive error detection width parameter (SV023 OD1 for servo or SP023 OD1 for spindle) if it's set incorrectly or too tightly. Inspect the machine for mechanical issues like collisions, binding, or jammed slides. Monitor the NC Servo Monitor for position droop during acceleration/deceleration and increase acceleration/deceleration time constants if needed. Tune position loop gain (SV003 PGN1, SP001 PGV / SP002 PGN) and speed loop gain (SV005 VGN1, SP005 VGN1) if they are too low. Inspect motor power cable connections (U, V, W) for looseness or shorts. Verify the encoder feedback cable and connector for secure connection and shielding. If these steps don't resolve the issue, consider replacing the MDS-E drive unit first, and if the alarm persists, replace the motor.

For Mitsubishi MDS-C drives, alarm 52 also means 'Excessive Error 1'. Review parameter SV023 (OD1) for servo or SP102, SP154, SP155, SP177, SP193, SP218 for spindle modes, and increase the value if set too small. Check position detector polarity parameters (e.g., SV017/bit4, SP097/bit5) and correct if reversed. Ensure the CHARGE lamp on the power supply unit is lit and measure voltage at the PN terminals (L+, L-); repair wiring or replace the power supply if voltage is low. Inspect motor power lines (U, V, W) for correct phase order and secure connections. Adjust acceleration/deceleration time constant or speed loop gain (VGN1) if the motor isn't tracking commands. Ensure motor brakes release completely and check for mechanical binding. Perform a detector swap test; if the alarm moves with the detector, replace it or its cable. If all else fails, replace the drive unit, then the motor if the alarm continues.

For Mitsubishi M70/M700/M800/M80 Series CNCs, alarm Z52 signifies a 'Battery fault'. Check for disconnections in the battery cable on the NC control unit and secure it. Replace the NC control unit's battery. After addressing the battery issue, verify that machining programs are correct.