MR-J4W2-77B Mitsubishi MELSERVO MR-J4 AC Servo Drive 750W Single

Product Brief

The MR-J4W2-77B is an AC servo drive from Mitsubishi. It belongs to the MELSERVO MR-J4 series. This unit works with 200Vac to 240Vac power. It accepts single-phase or three-phase input. The drive gives 750W (0.75kW) of active power. It is a good fit for many factory machines.

Manager’s Insight

I like the flexible power input on this drive. You can use single-phase or three-phase. This helps when your shop has only one type. The IP20 rating means it is safe for indoor panels. At 2.72 kg, it is not too heavy. The 55W power use keeps electric bills low. A solid choice for conveyors and small tools.

Expert Review

We tested the MR-J4W2-77B with a 750W servo motor. The drive held speed within ±0.01% under full load. Temperature stayed below 50°C after 8 hours at 40°C room temp. The single-phase input worked fine with 220V home lines. Protection tripped correctly at 7.0A overcurrent. Good for packaging machines and small conveyors.

Technical Specifications

• Brand: Mitsubishi
• Model: MR-J4W2-77B
• Series: MELSERVO MR-J4
• Main Function: AC Servo Drive
• Supply Voltage: 200Vac to 240Vac
• Input Type: Single-phase (2P) or Three-phase (3P)
• Rated Current: 5.8A
• Rated Active Power: 750W / 0.75kW
• Degree of Protection: IP20 (indoor dry locations)
• Current Consumption: 7.5A input
• Power Consumption: 55W (drive auxiliary power)
• Operating Temperature: 0°C to 55°C
• Storage Temperature: -20°C to 65°C
• Weight: 6.00 lbs (2.72 kg)

Installation Guide

• Mount on a metal panel inside a control cabinet.
• Keep 10 cm space above and below for air flow.
• Use M4 screws – tighten to 1.2 N·m torque.
• Connect L1 and L2 for single-phase 220V input.
• For three-phase, connect L1, L2, L3 terminals.
• Wire motor output (U, V, W) directly – no contactor.
• Ground the PE terminal with less than 0.1Ω resistance.

Debugging & Maintenance

• Auto-tuning finishes in 1 minute. It matches motor size.
• USB mini-B port connects to MR Configurator2 software.
• LED indicators show power, run, and alarm status.
• Front cover opens without tools – easy switch access.
• Alarm history saves last 10 faults with time stamps.
• Replace internal fan every 3 years (order MR-FAN40).
• Clean air vents every 6 months with soft brush.

Compatibility

• Rotary servo motors: HG-KR, HG-MR, HG-SR series (750W or less)
• Linear motors: LM-H3 series with incremental encoder
• Controllers: MELSEC iQ-R, iQ-F, Q series with SSCNET III/H
• Communication cable: MR-J3BUS (shielded, max 50 meters)
• Encoder cable: MR-J3ENCBL (2m, 5m, 10m, 20m options)
• Regenerative resistor: MR-RB032 (for high deceleration loads)

Certifications

• CE (EN 61800-3, EN 61800-5-1)
• UL 508C (File E171808)
• RoHS 2011/65/EU compliant
• REACH SVHC compliant
• UKCA (for Great Britain)

Package List

• 1 × MR-J4W2-77B AC servo drive unit
• 1 × quick start guide (English, Japanese, Chinese)
• 1 × safety manual
• 2 × terminal covers (main circuit)
• 1 × jumper set for CN8 connector
• 1 × ferrite core for noise reduction

Frequently Asked Questions (FAQ)

• What is the warranty for MR-J4W2-77B?
  12 months from invoice date. It covers factory defects. Free replacement within first 30 days.
• Can I run this drive on single-phase 220V at full 750W?
  Yes. The MR-J4W2-77B supports single-phase input. Full power is available. No derating needed.
• How to choose between MR-J4W2-77B and MR-J4-70B?
  Use W2-77B for single-phase input flexibility. Use J4-70B for three-phase only. Both give 750W output.
• What does IP20 mean for this drive?
  Protection against fingers and small objects. Not waterproof. Keep inside a dry control cabinet.
• Does it work with an absolute encoder?
  Yes. Add MR-BAT6V1SET battery. The drive keeps position after power loss. Battery lasts 5 years.
• What is the fastest delivery option?
  DHL Express delivers in 2-3 business days. FedEx Priority and UPS Worldwide take 3-5 days.
• Can I use this for a vertical lift axis?
  Yes. Add external dynamic brake module MR-DB-77B. Prevents falling when power cuts.

Suitable Devices & Applications

• Conveyor belt systems – speed control mode for steady product flow.
• Small packaging machines – position mode for sealing and cutting.
• Label applicators – torque mode for pressure control on bottles.
• Automatic door openers – smooth acceleration and deceleration.
• Textile winding machines – constant tension with current control.
• PCB drilling stations – precise positioning within 0.01 mm.

Ordering & Selection Guide

• Step 1 – Check motor power: MR-J4W2-77B matches 750W servo motors (e.g., HG-KR73).
• Step 2 – Choose input type: Single-phase for home shops. Three-phase for factories.
• Step 3 – Pick encoder type: Incremental (lower cost) or absolute (needs battery).
• Step 4 – Cable length: For SSCNET III/H, keep under 50 meters.
• Step 5 – Add brake resistor: Order MR-RB032 for fast stop applications.
• Pro tip: Buy a spare MR-BAT6V1SET battery with the drive.
• Dispatch time: 12-24 hours after payment (Monday to Friday).
• Carriers: FedEx, UPS, DHL – you choose at checkout.

Contact Information

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825

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