Mitsubishi Electric MR-J4-350A MELSERVO-J4 Series 1-Axis Servo Amplifier

Description

Designed for high-precision motion control, the Mitsubishi Electric MR-J4-350A operates within the MELSERVO-J4 platform to provide precise 1-axis servo motor regulation. Delivering a rated output of 3.5 kW, this unit employs a general-purpose interface supporting both analog input commands and pulse train inputs. With a 22-bit high-resolution absolute encoder interface, this amplifier ensures high speed and torque accuracy across demanding positioning systems. It incorporates integrated safety features such as Safe Torque Off (STO) and is built to comply with international functional safety standards, making it highly suitable for manufacturing, packaging, and high-performance material handling applications.

Key Features

• High-Resolution Feedback: Supports 22-bit encoder resolution (4,194,304 pulses per revolution) for fine positioning stability and minimized speed ripples.
• Flexible Command Interface: General-purpose control interface accommodates analog speed/torque signals and high-speed pulse train commands up to 4 Mpulses/s.
• Advanced Diagnostic Functions: Includes real-time vibration suppression control, machine diagnostics, power monitor functions, and lost motion correction.
• Integrated Functional Safety: Built-in STO (Safe Torque Off) certified to EN ISO 13849-1 Category 3 PL e, IEC 61508 SIL 3, and EN 62061 SIL CL 3.
• Robust Communications: Equipped with onboard USB interfaces for connection with MR Configurator2 and RS-422/RS-485 for multi-drop configurations up to 32 axes.

Applications

• Multi-Axis Packaging Systems: High-speed filling, sealing, and wrapping machinery requiring synchronized auxiliary axes.
• Textile Machinery: Continuous tension control and dynamic speed adjustments under variable loads.
• Material Handling & Gantry Systems: Accurate positioning of transfer arms, automated guided vehicles, and cartesian coordinates.
• Metalworking and Tooling: Auxiliary feed axes requiring robust torque retention and rapid response times.

Technical Specifications

Application Pitfalls & Engineering Notes

When utilizing the integrated dynamic brake during high-frequency stop-start sequences, thermal limits of the internal dissipation circuit must be observed. In situations where load inertia exceeds the permissible specifications of the internal regenerative resistor, an external regenerative option must be installed and configured in parameter settings to avoid AL 30 (Regenerative Error) or AL 33 (Overvoltage) faults.

Ensure proper installation clearance. Because of heat generation in a 3.5 kW amplifier, keep a minimum of 40 mm clearance above and below the module, and restrict vertical stack mounting unless active cabinet ventilation is engineered to keep ambient temperatures below 55 degC.

Commissioning & Wiring Tips

To eliminate electromagnetic interference on the high-speed pulse train lines (especially when operating near the 4 Mpulses/s differential limit), twisted-pair shielded cables are mandatory for the CN1 command connector. The shield must be clamped directly to the metal frame of the connector shell to establish a low-impedance high-frequency ground path.

When commissioning via MR Configurator2, use the USB type Mini-B port located behind the front slide-up cover. Perform the initial test run with the motor decoupled from the mechanical load to calibrate the automatic tuning loop parameters and safely verify rotational direction.

Installation Guidelines