SIMOTICS S-1FK2 Troubleshooting: Common Faults & Solutions

1. S-1FK2 Motor Overheating

• Long-time overload and frequent forward-reverse rotation
• Poor ventilation, dust accumulation on motor surface
• Ambient temperature exceeds the allowed operating range
• Improper parameter setting of acceleration and deceleration time
• Mechanical jamming or excessive load friction

• Check actual working load and avoid continuous overload operation.
• Clean dust and oil dirt from the motor housing and cooling surface regularly.
• Ensure installation position has good ventilation and heat dissipation space.
• Adjust acceleration and deceleration parameters in the drive to reduce impact current.
• Inspect mechanical coupling, gear and guide rail to eliminate stuck friction.

2. Overload & Overcurrent Alarm

• Mechanical load exceeds the rated torque of S-1FK2
• Shaft misalignment, coupling eccentric installation
• Internal motor winding insulation aging or short circuit
• Incorrect motor model parameter matching in the drive

• Recalculate load torque and confirm if S-1FK2 model matches application requirement.
• Reinstall and calibrate coupling shaft alignment to reduce radial force.
• Measure winding insulation resistance with a megohmmeter.
• Restore factory parameters and reconfigure motor nameplate data on the drive.

3. Encoder Communication Fault

• Loose or damaged encoder connector
• Broken or aging one-cable connection line
• Strong electromagnetic interference near the cable layout
• Encoder internal component wear after long service time

• Replug and lock the encoder connector firmly.
• Inspect the entire one-cable for breakage, aging or extrusion damage and replace if necessary.
• Separate servo cable from power cable, use shielded grounding strictly.
• Recalibrate encoder zero position; replace encoder module if fault persists.

4. Abnormal Noise & Vibration

• Bearing lack of lubrication or bearing wear
• Unbalanced mechanical load or loose mounting base
• Resonance caused by unreasonable gain parameters
• Internal rotor rubbing failure

• Check bearing operating status, add special lubricant or replace bearing.
• Fasten motor mounting screws and balance external mechanical load.
• Adjust servo gain and filter parameters to suppress resonance.
• Stop operation immediately if rubbing sound appears, disassemble for internal inspection.

5. Motor Startup Failure & No Output Torque

• Brake not released normally
  Power supply voltage unstable or phase loss
• Enable signal and control wiring logic error
• Motor internal winding open circuit

• Check brake power supply and release signal, confirm brake fully opens.
• Measure input voltage to ensure stable three-phase power supply.
• Check PLC control signal and wiring sequence, fix signal loss problem.
• Detect winding continuity; repair or replace the motor if open circuit exists.

6. Position Deviation & Inaccurate Positioning

• Encoder counting error or interference
• Mechanical clearance of transmission mechanism
• Servo parameter positioning gain set improperly
• Loose coupling leading to transmission gap

• Optimize shielding and grounding to eliminate encoder interference.
• Check belt, gear and ball screw clearance and perform gap compensation.
• Fine-tune position loop and speed loop gain parameters.
• Re-lock coupling and eliminate transmission looseness.