Description
Providing high-performance motion control via the SSCNET III/H synchronous network, the Mitsubishi Electric MR-J4-60B delivers precise positioning and speed control for demanding industrial automation systems. This 600W servo amplifier features native integration with high-speed motion controllers, utilizing a dedicated serial interface to process feedback loop data with microsecond-level synchronization. Equipped with built-in Safe Torque Off (STO) functionality and advanced real-time auto-tuning, the module ensures robust operational safety and minimizes mechanical vibration during transient acceleration cycles.
Features
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SSCNET III/H Communication: High-speed optical fiber network interface for reliable, noise-immune, and synchronous motion command updates.
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Sine-Wave PWM Control: Advanced current control loop design optimization for smooth rotation and minimized torque ripple.
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Embedded Safety Functionality: Integrated Safe Torque Off (STO) complying with IEC/EN 61800-5-2 for direct hardware-level safety shutdown.
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Real-Time Auto-Tuning: Automatically calculates load inertia ratio and adjusts servo gains continuously during machine operation.
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Integrated Dynamic Brake: Built-in hardware dynamic brake circuit for rapid motor deceleration in emergency-stop conditions.
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Compact Profile: Optimized footprint supporting high-density multi-axis installation configurations.
Applications
- Multi-axis pick-and-place robotic systems
- High-speed packaging and cartoning machinery
- Semiconductor fabrication and wafer handling systems
- Precision CNC tool positioning and indexing tables
- Automated print registration and web tension control lines
Technical Specifications
| Parameter |
Specification Value |
| Manufacturer |
Mitsubishi Electric |
| Model Identifier |
MR-J4-60B |
| Series |
MELSERVO-MR-J4 |
| Output Rated Voltage |
3-phase 170 VAC |
| Output Rated Current |
3.2 A |
| Main Circuit Power Supply |
3-phase or 1-phase 200 VAC to 240 VAC, 50/60 Hz |
| Main Circuit Rated Current |
3.2 A |
| Control Circuit Power Supply |
1-phase 200 VAC to 240 VAC, 50/60 Hz |
| Control Circuit Rated Current |
0.2 A |
| Interface Power Supply Requirement |
24 VDC +/- 10% (Required Current Capacity: 0.3 A) |
| Control Method |
Sine-wave PWM control / current control method |
| Safety Standard Compliance |
STO (IEC/EN 61800-5-2) |
| Infiltration Protection (IP Rating) |
IP20 (Natural cooling, open structure) |
| Operating Ambient Temperature |
0 to 55 degC (non-freezing) |
| Net Weight |
1.0 kg |
| Shipping Weight (Calculated) |
2.0 kg |
| Package Dimensions (Calculated) |
250 mm x 200 mm x 100 mm |
Connections and Interfaces
| Port/Connector |
Functional Assignment |
| CN1A / CN1B |
SSCNET III/H synchronous bus loop input/output connections |
| CN2 |
Feedback loop encoder connector (supports high-speed serial encoder communication) |
| CN3 |
I/O digital signals, limit switches, and physical stroke inputs |
| CN8 |
Safety system dual-channel STO signal connection |
| L1 / L2 / L3 |
Main circuit AC power supply input terminals |
| L11 / L21 |
Control circuit auxiliary AC power supply input terminals |
| U / V / W |
Servo motor power output phase terminals |
Empirical Engineering Insights
Alternative Models & Compatibility
The MR-J4-60B serves as the standard replacement path for legacy MR-J3-60B amplifiers on SSCNET III networks. While drop-in physical installation is possible, migration requires setting the parameters via MR Configurator2 to J3 compatibility mode. Note that high-resolution encoder capabilities and specific safety routines are capped when running on older backplanes.
Application Pitfalls & Engineering Notes
When utilizing single-phase 200 VAC instead of a balanced three-phase system, output current performance must be derated. Ensure the internal dynamic brake resistor cycle limit is not exceeded; high-frequency start/stop sequences can thermal-trip the drive. Maintain at least 10 mm spacing between adjacent drives when close-mounting in high-temperature environments.
Commissioning & Wiring Tips
Always use correct fiber-optic bend radii (minimum 25 mm) for SSCNET III cabling to avoid communication packet losses (indicated by AL 37 or AL e6 alarms). Ensure that shield grounding brackets are clamped directly to the bare metal mounting plate close to the CN2 encoder cable breakout to minimize EMI loop intrusion.
Installation Guidelines
CRITICAL WARNING: HIGH VOLTAGE RISK
Isolate and lock out all AC input power feeds before performing any service work. Wait at least 15 minutes after power-down to allow internal high-capacitance reservoirs to discharge fully. Verify that the front panel charge indicator LED is completely extinguished and measure the DC bus voltage across terminals P+ and N- with a certified meter before accessing terminal blocks.
1
Mount the amplifier vertically on a flat, unpainted metal backplane panel to secure proper thermal dissipation paths and a robust common ground.
2
Ensure separate routing channels for high-voltage power leads (L1/L2/L3, U/V/W) and low-signal communication cables (SSCNET III fiber-optic and CN2 encoder lines) to avoid inductive coupling.
3
Tighten all terminal connections to the OEM torque specification limits to prevent thermal hot spots under peak continuous operating currents.