Description
MDS-EJ-SP-20 is a Mitsubishi Electric spindle drive unit from the MDS-EJ/EJH all-in-one compact drive series, designed for CNC machine tools.
Description
- Manufacturer: Mitsubishi Electric
- Series: MDS-EJ / EJH Series
- Model: MDS-EJ-SP-20
- Type: 1-axis spindle drive unit (with built-in converter)
- Application: CNC lathes, machining centers, milling machines, industrial automation systems
Main Function
This unit is a spindle drive amplifier that:
- Receives spindle speed commands from the CNC controller
- Controls spindle motor speed and torque
- Provides smooth acceleration/deceleration
- Includes built-in converter and regenerative control
- Supports high-speed CNC spindle operation
Key Specifications
- Drive category: 1-axis spindle drive (with converter)
- Nominal maximum current (peak): 20 A
- Power input: 3-phase 200–240 VAC
- Input current: 2.6 A
- Control power: Single-phase 200–240 VAC
- Control method: Sine-wave PWM control
- Regeneration method: Power regeneration method
- Cooling: Forced air cooling
- Protection class: IP20
- Weight: Approx. 1.4 kg
Main Connections / Terminals
Typical terminals and connectors include:
- L1, L2, L3 → 3-phase AC power input
- U, V, W → spindle motor output
- L11, L21 → control power input
- P+, C, D → regenerative resistor connection
- CN1A / CN1B → optical communication
- CN2 / CN3 → encoder connections
- E → grounding terminal
CNC System Role
CNC controller → MDS-EJ-SP-20 → 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