Mitsubishi Electric MR-J3-700A4 MELSERVO J3 Series Servo Amplifier

SKU MR-J3-700A4

Disponibile

12-month warranty
Free returns within 30 days

Manufacturer: Mitsubishi Electric
Product No.: MR-J3-700A4
Origin United States
Product Type: Servo Amplifiers
Payment: T/T, Western Union
Weight: 6.2 kg
Shipping port: Xiamen
Warranty: 12 months

Product Description

Description

Handling high-inertia loads and precise speed regulation, the Mitsubishi Electric MR-J3-700A4 is a 400V class industrial servo drive engineered for demanding motion control architectures. This unit integrates seamlessly into the MELSERVO-J3 system landscape, utilizing advanced digital control loops to provide accurate torque, velocity, and position regulation when paired with high-capacity rotary servo motors. Designed with an analog and pulse train interface, it allows direct integration with standard PLC positioning modules and external motion controllers.

Features

Adaptive Auto-Tuning: Real-time estimation of load inertia ratio ensures rapid gain optimization and stable loop performance under varying load profiles.
Vibration Suppression: Advanced dual-frequency suppression filters counter mechanical resonance and protect mechanical transmission elements from high-frequency wear.
High-Resolution Feedback Compatibility: Direct interface for absolute or incremental high-resolution encoders, providing excellent positioning accuracy.
Integrated Protection Circuits: Overcurrent, regenerative overvoltage, overload, and encoder fault detection systems safeguard both driver and motor from electrical damage.

Applications

Large-scale gantry robots and heavy-duty material handling axes.
Multi-axis CNC machining centers, precision indexing tables, and metal forming machinery.
Continuous web tension control in paper converting, printing, and high-speed packaging lines.

Technical Specifications

Specification Parameter	Value / Detail
Manufacturer	Mitsubishi Electric
Model Number	MR-J3-700A4
Output Capacity	7.0 kW
Rated Output Voltage	3-phase 323 VAC
Rated Output Current	17.0 A
Main Circuit Supply Voltage	3-phase 380 to 480 VAC, 50/60Hz
Main Circuit Rated Current	14.4 A
Permissible Voltage Fluctuation	3-phase 323 to 528 VAC
Control Circuit Supply Voltage	1-phase 380 to 480 VAC, 50/60Hz
Control Circuit Rated Current	0.2 A
Power Consumption	45 W
Cooling Mechanism	Force-cooling (integrated fan)
Dynamic Brake	Built-in
Net Weight	6.2 kg
Shipping Weight (Calculated)	8.0 kg
Country of Origin	Japan

Power and Terminal Assignments

Terminal Designation	Function / Connection Assignment
L1 / L2 / L3	Main circuit AC power input (3-phase 380V to 480VAC)
L11 / L21	Control circuit AC power input (1-phase 380V to 480VAC)
U / V / W	Servo motor power output connections
P+ / C / D	Regenerative brake resistor configuration terminals
PE	Protective Earth ground connections

Empirical Engineering Insights

Alternative Models & Compatibility

The MR-J3-700A4 represents the analog/pulse train interface option. When migrating systems or selecting replacement spares, note that the MR-J3-700B4 utilizes the SSCNET III optical fiber bus and is not a direct electrical drop-in. For retrofits where MR-J3 models are reaching end-of-life, the MR-J4 series can serve as an alternative, but requires a conversion cable kit and parameter translation using MR Configurator2 software.

Application Pitfalls & Engineering Notes

Under continuous high-cycle operations with large-inertia loads, thermal saturation of the built-in dynamic brake resistor is a common failure vector. If the amplifier experiences frequent AL.30 (Regenerative Error) or AL.45 (Main Circuit Overheat) faults, confirm that the duty cycle matches the thermal specifications or install an external, high-capacity regenerative brake resistor between terminals P+ and C (ensuring the jumper between PR and C is removed).

Commissioning & Wiring Tips

Always route control I/O (CN1) cables separately from the main motor power cables (U/V/W) to prevent electromagnetic interference. Keep the encoder cable shield terminated securely at the drive chassis clamp. When using open-collector pulse inputs rather than differential line drivers on CN1, maximum feed frequency is significantly reduced, which can limit the top velocity performance of high-resolution profiles.

Installation Guidelines

CRITICAL SAFETY WARNING

Isolate and verify all power sources are completely de-energized before mounting, terminating, or servicing the unit. High voltage remains stored in the internal DC bus capacitors even after powering off. Wait at least 20 minutes and verify that the charge LED on the front face of the amplifier is completely extinguished before making contact with terminal connections.

Vertical Orientation: Mount the servo amplifier vertically on a flat, non-flammable mounting panel inside a sealed control enclosure. Ensure a minimum clearance of 40mm above and below the housing, and at least 10mm on both sides, to ensure unobstructed forced airflow through the cooling channels.

Ground Connection: Ground the drive's Protective Earth (PE) terminal to the cabinet's main copper bus bar using low-impedance copper wire of adequate gauge. Do not daisy-chain ground terminals between adjacent amplifiers.

Cable Termination: Ensure all power terminals are torqued to the manufacturer’s specifications. Loose connections will cause localized heating and terminal board degradation under continuous rated operational currents.

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What is the primary difference between MR-J3-700A4 and MR-J3-700B4?

The MR-J3-700A4 uses standard analog input voltages and pulse train interfaces for control, whereas the MR-J3-700B4 is designed for SSCNET III optical fiber communication network control. They cannot be directly swapped without modifying the controller interface.

Which alarm codes are typically associated with thermal or overtemperature faults on this unit?

Common thermal alarms include AL.30 (Regenerative Overvoltage / Brake Overheat), AL.45 (Main Circuit Overheat), and AL.E9 (Main Circuit Cooling Fan Stall). Check ventilation clearance and dynamic brake configuration when these occur.

How do you clear a persistent AL.30 fault on the MR-J3-700A4?

Ensure the regenerative duty cycle is within limits. If internal capacity is exceeded, connect an external regenerative brake resistor across terminals P+ and C after physically removing the factory-installed jumper wire between PR and C.

Does this servo drive support both 3-phase and 1-phase control power?

Yes. The main circuit requires a 3-phase 380V to 480VAC supply, while the control circuit operates on a separate 1-phase 380V to 480VAC supply to maintain logic control even if the main high-voltage circuit is isolated.

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