MSK071E-0300-NN-M1-UG1-NNNN Rexroth dcs Servo Motor original

• Brand
  Rexroth
• Model
  MSK071E-0300-NN-M1-UG1-NNNN
• Product Name
  IndraDyn S MSK Permanent‑magnet Synchronous Servo Motor
• Dimensions
  228 mm × 118 mm × 118 mm
• Weight
  5.1 kg
• Place of Origin
  Germany
• HS Code
  85013100
• Operating Temperature
  0 °C to +40 °C
• Storage Temperature
  ‑20 °C to +70 °C
• Power Supply
  400 V
• Warranty
  12 month
• Status
  new brand

Rexroth MSK071E-0300-NN-M1-UG1-NNNN Input, Output, Voltage & Current Detailed Description

Power Input

Main power input: Three-phase AC power fed by servo drive, corresponding DC-bus supply voltage ranges from 300-750 VDC, compatible with 230 VAC and 400-480 VAC industrial servo power networks.

Brake power input: External 24 VDC power supply for integrated holding brake, allowable tolerance ±10 %.

Encoder power input: 7-12 VDC low-voltage power supplied by servo drive for built-in Hiperface absolute encoder.

Signal Output

Encoder feedback output: Hiperface digital absolute position signal, transmits rotor position, speed and motor temperature data back to servo controller.

Temperature signal output: PT1000 thermal sensor signal inside motor winding, feeds real-time winding temperature to drive for over-temperature protection.

No discrete digital switching output is available directly from the motor body; all logic signals are processed on the matched servo drive unit.

Electrical Parameters-Voltage

Motor winding rated operational voltage: Optimized for 400V-class servo drive system; voltage constant Ke = 126.4 V/1000 min⁻¹ under 20 °C ambient condition.

Brake rated voltage: DC 24 V.

Encoder supply voltage range: 7-12 VDC.

Electrical Parameters-Current

Continuous stand-still effective current I0_60 (60 K temperature rise, natural cooling): 12.5 A.

Continuous stand-still effective current I0_100 (100 K temperature rise, natural cooling): 15.2 A.

Maximum peak effective current Imax (short-term dynamic overload): 56.3 A, applicable for limited acceleration-deceleration duty cycle.

Holding-brake rated operating current: 0.79 A.

Winding Characteristic Parameters

Winding resistance R1-2 (phase-to-phase, 20 °C): 0.79 Ω.

Winding inductance L1-2 (phase-to-phase): 6.20 mH.

Brake feature: De-energized holding type, holding torque 23 Nm.

Remarks

All motor winding current values represent RMS effective values. Actual operating current changes dynamically according to applied load torque, rotating speed and working duty cycle. The brake power circuit is electrically independent of the main motor power winding. No high-power output is provided by the motor itself; torque and motion output are mechanical shaft power instead of electrical output.

Common Faults & Troubleshooting for Rexroth MSK071E-0300-NN-M1-UG1-NNNN

Motor does not run after enable command

Possible causes: Absence of drive enable signal; loss of main power or 24 VDC brake supply; failure of holding-brake release; mechanical shaft blockage; drive hardware defect.

Solutions: Inspect PLC enable logic and field wiring; confirm DC-bus voltage and 24 V brake power supply (0.79 A rated current); measure brake coil resistance and verify audible “click” when brake is energized; disconnect mechanical load and check shaft free rotation; review alarm codes on servo drive.

Encoder feedback alarms (F229, F276, position fluctuation)

Possible causes: Damaged, loose Hiperface encoder cable or bent connector pins; heavy electromagnetic interference induced by high-power cables; defective shield grounding; absolute position drift; internal encoder hardware damage.

Solutions: Reconnect or substitute encoder cable; route feedback cables separately from power cables; perform single-ended shield grounding; reset absolute position through IndraWorks engineering software; examine connector pins; replace encoder unit if fault remains unresolved.

Motor overheat and overtemperature alarm

Possible causes: Sustained overload beyond continuous torque rating; repeated heavy-load acceleration and deceleration; impaired heat dissipation; improper servo gains resulting in persistent oscillation; loose or faulty PT1000 temperature sensor.

Solutions: Keep operating load within motor continuous specifications; optimize motion trajectory parameters; clear dust deposits on motor housing; re-tune speed-loop and position-loop gains; check temperature-sensor connections; shut down equipment and arrange professional maintenance for defective sensor.

Unusual noise, vibration and mechanical resonance

Possible causes: Coupling misalignment; loose mounting fasteners; degraded motor bearing; unbalanced driven machinery; poorly adjusted servo parameters; coincidence with system mechanical resonant frequency.

Solutions: Realign coupling coaxiality; fasten all mounting bolts; conduct no-load test to differentiate motor-originated noise from load-related noise; configure notch filter and adjust servo gains; arrange authorized service for bearing replacement if metallic grinding noise occurs.

Following error / position deviation alarm

Possible causes: Mechanical jam or excessive friction; insufficient torque reserve; incorrect commutation offset; unstable encoder feedback signal; severe inertia mismatch.

Solutions: Remove mechanical obstructions; monitor torque utilization via drive diagnostic function; perform automatic motor commutation identification; validate feedback signal integrity; fine-tune inertia ratio settings.

Holding-brake abnormal operation

Possible causes: 24 VDC brake supply out of ±10 % tolerance range; reversed brake wiring polarity; open-circuit or short-circuit of brake coil; mechanical wear or seizure of brake friction pads.

Solutions: Adjust regulated 24 V power supply output; correct positive-negative wiring polarity; measure coil resistance value; replace brake module in case of mechanical wear. Important note: The holding-brake shall not serve as primary personal safety protection.

Winding insulation degradation / phase imbalance

Possible causes: Insulation ageing caused by prolonged overheating; moisture penetration into motor interior; damaged power cable conductors.

Solutions: Check balance of phase-to-phase winding resistance; carry out insulation resistance test with 500 VDC megohmmeter (DO NOT apply megohm voltage to encoder circuit); replace power cable firstly; send motor for professional rewinding if internal winding is impaired.

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