Mitsubishi Electric MR-J4-20B MELSERVO-J4 Series Servo Amplifier

Description

Engineered for high-precision motion control, the Mitsubishi Electric MR-J4-20B servo amplifier delivers advanced positioning and synchronization capabilities within the MELSERVO-J4 platform. Utilizing high-speed SSCNET III/H communication, this 0.2 kW amplifier processes synchronous commands at up to 0.222 ms cycles, facilitating precise closed-loop operations. A built-in Safe Torque Off (STO) function provides safety features conforming to EN ISO 13849-1 Category 3 PL e and IEC 61508 SIL 3. Configured with advanced auto-tuning algorithms and multi-stage vibration suppression filters, this amplifier compensates for mechanical resonance in highly dynamic automated installations.

Features

• SSCNET III/H Interface: High-speed optical bus system offering noise-immune transmission with communication cycles as low as 0.222 ms.
• Safe Torque Off (STO): Integrated hardware safety features ensuring compliance with international machinery directives up to SIL 3 and PL e.
• Adaptive Vibration Suppression Control II: Dynamically adjusts to changing mechanical frequencies to eliminate micro-vibrations and load resonance.
• Flexible Input Configuration: Acceptable voltage fluctuations allow operation on both single-phase and three-phase AC 200 V to 240 V power systems.
• Integrated Diagnostics: Internal drive recorder and machine diagnostic functions monitoring performance metrics via the MR Configurator2 interface.

Applications

• High-speed semiconductor assembly and pick-and-place equipment.
• Multi-axis coordinated robotic joints and gantry packaging systems.
• Precision linear positioning tables and metal forming machinery.

Technical Specifications

Connections and Interfaces

Alternative Models & Compatibility

The MR-J4-20B functions as a direct drop-in replacement for legacy MR-J3-20B amplifiers. While it contains J3 compatibility modes, parameters must be initialized and downloaded via MR Configurator2 to map features over legacy network structures correctly. Be aware that running in J3 mode disables certain MR-J4 diagnostics, such as the high-resolution encoder response profiles.

Application Pitfalls & Engineering Notes

Operating the unit under a single-phase AC input increases current load on the internal rectifier bridge. Ensure the control and input line sizing matches single-phase specifications, and avoid driving the motor at continuous peak rated torque to mitigate heat accumulation in the rectifier circuit. Keep side clearances to at least 10 mm when multiple units are side-mounted to prevent thermal overload faults (AL.46).

Commissioning & Wiring Tips

Ensure optical fiber cables connected to CN1A/CN1B maintain a bending radius greater than 25 mm. Sharp bends cause signal degradation, resulting in random communication timeouts and AL.37 errors. Additionally, if the Safe Torque Off (STO) function is not integrated into a safety system, the short-circuit connector must remain firmly plugged into the CN8 port to allow normal amplifier operations.

Installation Guidelines