Mitsubishi MR-J3-700BN 7kW Servo Amplifier

The Mitsubishi MR-J3-700BN is a powerful and advanced servo amplifier designed for high-demand industrial motion control. This 7kW unit delivers robust performance for heavy-duty applications. It is engineered with the SSCNET III/H interface for seamless integration within the MELSERVO MR-J3 series.

Primary Electrical Specifications

• Manufacturer & Model: Mitsubishi MR-J3-700BN Servo Amplifier.
• Rated Output: 7000W (7 kilowatts) for high-torque applications.
• Supply Voltage: 3-phase 200 to 230 Volts AC, 50/60 Hz input.
• Communication Interface: High-speed SSCNET III/H optical interface.
• Control Method: Sine wave PWM control combined with current control.
• Interface Power: Requires 24 Volts DC at 150 milliamperes capacity.

Performance & Protection Details

• Braking System: Compatible with an external dynamic brake unit for enhanced stopping control.
• Built-in Resistor: Features a 170 Watt built-in regenerative resistor.
• Frequency Tolerance: Permits input frequency fluctuations between -5 to +5%.
• Capacitor Charging: Has a capacitor charging capacity of 70 joules.
• Inrush Current: Main circuit: 88 Amperes; Control circuit: 30 Amperes.
• Operating Temperature: Reliable in ambient temperatures from 0 to 55 °C (non-freezing).

Packaging & Shipping Information

• One Mitsubishi MR-J3-700BN Servo Amplifier unit.
• Complete installation guide and technical specification documents.
• All necessary mounting brackets and hardware.
• International shipping via FedEx, UPS, and DHL for efficient delivery.

Professional FAQ

• What is the purpose of the external dynamic brake connection?

For high-inertia loads or rapid cycling applications, the internal regenerative resistor may be insufficient. The external brake connection allows you to add a more powerful external braking resistor or brake unit to safely dissipate the excess regenerative energy without faulting the drive.

• Why are there two different inrush current ratings?

The main circuit inrush (88A) occurs when power is first applied to charge the large DC bus capacitors. The control circuit inrush (30A) is for its smaller internal power supply. Your system's circuit breakers or fuses must be sized to handle these brief surges without nuisance tripping.

• How does the 70-joule capacitor charging capacity affect safety?

This indicates the amount of energy stored in the DC bus capacitors. It is a critical safety specification. Technicians must wait the specified time after power-off (as per the manual) before servicing to allow this stored energy to dissipate, preventing electric shock.

• When would the built-in 170W regenerative resistor be adequate?

It is suitable for applications with moderate inertial loads and infrequent deceleration cycles. If your application involves frequent stop/start motions or high inertia, you should monitor the resistor's temperature or plan to use an external resistor to avoid overload faults.

• What does the ±5% frequency fluctuation tolerance mean for operation?

The MR-J3-700BN can maintain stable operation even if the incoming line frequency varies slightly (e.g., between 47.5 Hz and 52.5 Hz on a 50 Hz nominal system). This is important in areas with unstable power grids or when operating from a generator.

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