ELAU PacDrive SM Servo Motor Application and Maintenance Guide

Maintenance, troubleshooting, and repair

1. Daily maintenance and cleaning

SM motors are basically maintenance free, but it should be noted that:

Cleaning: It is strictly prohibited to use a high-pressure cleaning machine to directly rinse the motor, especially in the IM V3 installation position. Use a damp cloth or low-pressure mild cleaner.

Long term storage of brake: If the motor is stored for more than 2 years, the brake must be "run in" before installation. Manually rotate the motor shaft about 50 revolutions in the brake closed state to remove the oxide layer and impurities on the surface of the friction plate.

2. Common faults and countermeasures

Possible causes of malfunction and troubleshooting steps

The motor cannot start, reporting "phase loss" or "overcurrent". The power cable X2 has poor contact and is disconnected; Check if the U/V/W phase resistors are balanced, if the connectors are locked, and if the cables are bent or broken for damage to the driver power module

Report "overload" or "high motor temperature" during operation, mechanical jamming, excessive load, high ambient temperature, fan failure (if any), disconnect the coupling for no-load trial operation; Check if the actual load exceeds the S1 curve; Improve heat dissipation conditions; Check if the surface ventilation fan is running

During operation, there is a report of "encoder fault". The encoder cable X4 is poorly shielded, the signal line is broken, the encoder is contaminated or damaged by impact. Check the grounding of the shielding layer and use an oscilloscope to measure whether the SIN/COS waveform is intact; Check if RS485 communication is normal; After replacing the encoder, it is necessary to perform phase initialization again

The shaft cannot be locked, the vertical axis sliding brake is not powered, the brake coil is open, and the brake pad wear is measured. The voltage at pin 3/4 of X3 should be 24V DC; Measure the resistance of the brake coil (should be tens of ohms); Manually test whether the brake can be engaged

When the motor is running, there is loud noise, severe vibration, and the shaft load exceeds the allowable radial force. The coupling is poorly aligned and the dynamic balance is damaged. Check whether the bearings are damaged; Re calibrate the coupling alignment; Check if the keyway or expansion sleeve is loose

3. Replace the motor or cable

When it is necessary to replace the motor:

Safety first: Cut off the main power supply and wait for the DC bus capacitor to discharge for at least 5 minutes. The servo motor generates dangerous voltage in generator mode, do not disconnect the connector while it is powered on.

ESD prevention: When handling encoders or replacing motors, wear an anti-static wristband and and touch grounded metal to release static electricity.

Operation after replacement: After replacing the motor, due to the loss of the mechanical position reference point (especially in a semi closed loop system that only relies on the motor encoder), the origin of the machine coordinate system must be re established. For motors fed back by Resolvers, phase angle identification (Commutation alignment) is also required.

Fault report and repair

When an irreparable fault occurs in the motor, the correct repair process can accelerate the processing speed:

Fill out the error report form: Provide a detailed description of the fault phenomenon (whether it is persistent or occasional, and whether it is related to temperature or vibration), motor model, serial number, hardware code, operating time, and machine operating conditions.

ESD packaging: Place the motor in the original or equivalent anti-static packaging bag to prevent electrostatic damage during transportation.

Repair address:

ELAU AG, Abt. Kundendienst, Dillberg 12, D-97828 Marktheidenfeld, Germany

Or contact the local ELAU representative.