Sinamics MR-J2S-40B Overview
Mitsubishi MR-J2S-40B is a high-performance AC servo drive of the Melservo J2S series, with a rated output power of 0.4KW. It supports 200-230V AC single/three-phase input and features built-in dynamic brake and natural cooling design, ensuring stable operation in industrial environments with 0~+55℃ operating temperature. Adopting sine wave PWM and current control technology, it is equipped with real-time auto-tuning and automatic motor type recognition, matching with HC-KFS series servo motors to achieve precise and efficient motion control.
Figure 1 shows the front panel of MR-J2S-40B.


Quick Specs.
Table 1 shows the Quick Specs.
| Item |
Specification |
| Brand |
Mitsubishi Electric |
| Rated Power |
0.4KW/400W |
| Input Voltage |
200-230V AC (1/3 Phase) |
| Operating Temp |
0~+55℃ |
| Dimension |
168×70×135mm |
| Net Weight |
1.1kg/2.43lbs |
Detailed Specification
English Parameter Table
| Parameter Category |
Details |
| Basic Information |
Brand: Mitsubishi Electric
Series: Melservo J2S
Type: AC Servo Drive/Amplifier
Part Number: MR-J2S-40B |
| Electrical Parameters |
Rated Output Power: 0.4KW/400W
Input Voltage: 200-230V AC (50/60Hz, 1/3 Phase optional)
Output Voltage: 170V AC
Output Frequency: 0-360Hz
Auxiliary Power Consumption: 50W
Regenerative Resistor Power: 10W |
| Control Performance |
Control Method: Sine wave PWM/Current control
Auto-tuning: Real-time auto-tuning
Encoder Resolution: 131072 pulses/rotation
Load Inertia Moment Ratio: 30 times
Communication: SSCNET III/H, RS232/RS485 |
| Mechanical Parameters |
Dimensions (H×W×D): 168mm×70mm×135mm
Net Weight: 1.1kg (2.43lbs)
Mounting: M4 mounting screw |
| Environmental Parameters |
Operating Temperature: 0~+55℃
Storage Temperature: -20~+65℃
Humidity: ≤90%RH (no condensation)
Protection Grade: IP00 |
| Protection Functions |
Overcurrent/overload/undervoltage shut-off
Servo motor overheat protection
Encoder/regeneration fault protection
Overspeed/excessive error protection
Sudden power outage protection |
| Compatible Motors |
HC-KFS-43, HC-MFS-43, HC-UFS-43 (3000r/min) |
| Interface |
1×Digital Input (24VDC)
1×Digital Relay Output
2×Analog Output (-10~+10VDC) |