Description
MDS-EJ-SP-120 is a Mitsubishi Electric all-in-one spindle drive unit from the MDS-EJ/EJH series, designed for CNC machine tools and industrial automation systems.
Description
- Manufacturer: Mitsubishi Electric
- Series: MDS-EJ / EJH Series
- Model: MDS-EJ-SP-120
- Type: 1-axis spindle drive unit with built-in converter
- Application: CNC lathes, machining centers, milling machines, turning centers
Main Function
This unit is a spindle amplifier that:
- Receives spindle speed commands from the CNC controller
- Controls spindle motor speed and torque
- Provides smooth acceleration/deceleration
- Supports regenerative braking
- Uses compact integrated drive architecture
Key Specifications
- Nominal maximum current (peak): 120 A
- Power input: 3-phase 200–240 VAC
- Rated input current: 26.0 A
- Control power input: Single-phase 200–240 VAC
- Frequency: 50/60 Hz
- Control method: Sine-wave PWM control
- Regeneration method: Power regeneration method
- Protection class: IP20
- Cooling: Forced air cooling
- Weight: Approx. 4.0 kg
Main Connections / Terminals
Typical connectors include:
- L1, L2, L3 → 3-phase AC input
- U, V, W → spindle motor output
- L11, L21 → control power input
- P+, C, D → regenerative resistor terminals
- CN1A / CN1B → optical communication
- CN2 / CN3 → encoder connections
- PE / E → grounding terminal
CNC System Role
CNC controller → MDS-EJ-SP-120 → Spindle motor → Machine spindle rotation
Important Clarification
- SP models = spindle motor drives
- V1 models = servo axis drives
- CV models = power supply / converter units
- DH-AL models = AC input reactors
Features
- Ultra-compact all-in-one design
- Built-in converter section
- High-precision spindle speed control
- Regenerative braking capability
- Reduced CNC cabinet size
- Designed for Mitsubishi MELDAS CNC systems