Mitsubishi Electric MR-J4-70A MELSERVO-J4 Series 1-Axis Servo Amplifier

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Manufacturer: Mitsubishi Electric
Product No.: MR-J4-70A
Country of origin:United States
Product Type: Servo Drive Modules
Payment: T/T, Western Union
Weight: 1400g
Shipping port: Xiamen
Warranty: 12 months

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Description

Optimizing dynamic positioning trajectories in automated systems, the Mitsubishi Electric MR-J4-70A operates as a 1-axis servo amplifier within the MELSERVO-J4 product range. Engineered for 200V class systems, this drive outputs a continuous rated current of 5.8 A to drive 0.75 kW rotary servo motors with deterministic execution. By executing sinusoidal wave PWM control alongside 22-bit high-resolution feedback systems, the module maintains micro-precision tracking loop speeds. The hardware is equipped with built-in Safe Torque Off (STO) safety networks certified to SIL 3 / PL e, providing physical energy cut-offs to prevent unauthorized motor restarts during maintenance windows.

Key Technical Features

Advanced Control Loop: Sinusoidal wave PWM control and high-accuracy current control system for optimal torque response.
High-Resolution Feedback: Evaluates 22-bit encoder signals directly, translating to 4,194,304 pulses per revolution for micro-stepping alignment.
Multi-Drop Communication: Built-in RS-422 and RS-485 interfaces support multi-drop architecture linking up to 32 axes in a serial line.
Integrated Safety: Features hardware-implemented Safe Torque Off (STO) compliant with EN ISO 13849-1 Category 3 PL e and IEC 61508 SIL 3.
Regenerative Capabilities: Equipped with a built-in 20W regenerative resistor to handle decelerating motor inertia.

Industrial Applications

High-speed packaging, sealing, and continuous film-feeding machinery.
Multi-axis pick-and-place gantry robots and material handling lines.
Precision semiconductor wafer processing and sorting systems.
CNC machining tool changers and index tables.

Technical Specifications

Parameter	Specification Value
Manufacturer	Mitsubishi Electric
Model Code	MR-J4-70A
Series Name	MELSERVO-J4 Series
Main Circuit Power Input	Three-phase or single-phase AC 200 V to 240 V, 50/60 Hz
Allowable Voltage Fluctuation	AC 170 V to 264 V
Motor Rated Output	0.75 kW
Rated Output Current	5.8 A
Control Method	Sinusoidal wave PWM control and current control system
Feedback Resolution	22-bit (4,194,304 pulses/rev)
Built-in Regenerative Resistor	20 W
Safety Certification	EN ISO 13849-1 Category 3 PL e, IEC 61508 SIL 3, EN 62061 SIL CL 3
Ingress Protection Rating	IP20 (open structure)
Operating Temperature Range	0 to 55 degC (non-freezing)
Vibration Resistance	5.9 m/s2, 10 Hz to 55 Hz (X, Y, Z directions)
Net Unit Weight	1.4 kg
Shipping Weight (Calculated)	3.5 kg

Connections and Interfaces

Connector Port	Function / Signal Assignment
CN1	Analog command interface / General-Purpose I/O signals
CN2	Encoder feedback connection (high-speed serial interface)
CN3	RS-422 / RS-485 serial communication port
CN5	USB port for PC setup software (MR Configurator2)
CN8	Safe Torque Off (STO) input / Safety signal connection

Empirical Engineering Insights

Alternative Models & Compatibility

The MR-J4-70A includes integrated MR-J3 compatibility parameters, allowing direct electrical substitution of older MR-J3-70A units in most positioning setups. However, when retrofitting legacy panels, note that the physical footprint and mounting hole locations differ slightly; always verify sheet metal mounting templates prior to structural installation.

Application Pitfalls & Engineering Notes

While equipped with a built-in 20W regenerative resistor, high-duty-cycle vertical axis applications or large inertial loads can trigger "AL 30" (Regenerative Error) codes. To prevent operational shutdowns, calculate the cumulative kinetic energy feedback and consider wiring an external heavy-duty regenerative resistor across the P+ and C terminals, while updating parameter Pr. PA02 to indicate external power dispersion.

Commissioning & Wiring Tips

Ensure the CN8 safety jumper plug is inserted if the Safe Torque Off (STO) function is not wired to an external safety relay. Removing the plug or leaving the STO circuit open will generate an "AL 9F" (Safety Stop) system inhibit, preventing motor excitation. Always isolate control-signal cables (CN1/CN2) from the motor power line (U/V/W) by at least 30 cm to eliminate parasitic electromagnetic interference.

Installation Guidelines

CRITICAL WARNING: Verify that all AC main line feeds are fully de-energized. Allow a minimum of 15 minutes after power-down for internal DC bus capacitors to discharge to safe levels. Verify the bus voltage across terminals P+ and N- is under 20V DC using a certified digital multimeter before making any wiring physical contact.

Mount the amplifier vertically on an unpainted, conductive metallic backplate to ensure solid chassis grounding and maximum passive heat convection.

Maintain at least 10 mm clearance on both sides and 40 mm clearance above and below the amplifier to prevent thermal accumulation inside enclosed panels.

Ensure all power terminal block screws are torqued to the OEM specification of 1.2 N-m to minimize contact resistance.

Perform a continuity test on the grounding terminal (PE) prior to applying control and main circuit power.

Key Features:

#MELSERVO-J4 #Servo Amplifiers

What causes the AL 9F alarm code on the MR-J4-70A amplifier?

This code represents a Safety Stop state. It triggers if the CN8 STO connector is unplugged, miswired, or missing its safety shorting bypass plug.

Can this servo amplifier operate on single-phase AC power input?

Yes, it supports single-phase AC 200V to 240V power on terminals L1 and L2, but output torque and performance may be derated under peak dynamic loads.

What software is used to configure and tune the MR-J4-70A drive?

Mitsubishi Electric's MR Configurator2 software is used via the CN5 USB interface for parameter adjustments, real-time tuning, and diagnostic diagnostics.

How do I resolve a persistent AL 30 (Regenerative Error) alarm?

Increase deceleration ramp times, install an external regenerative resistor between terminals P+ and C, and update parameter Pr. PA02 to active external dissipation mode.

Global Express Shipping

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Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
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Returns & Warranty

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TECHNICAL SPECIFICATIONS

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Mitsubishi Electric MR-J4-70A MELSERVO-J4 Series 1-Axis Servo Amplifier