The MR-JE-70A is a 750 W servo amplifier from Mitsubishi Electric, part of the MELSERVO-JE series — the cost-optimised general-purpose servo platform with analogue/pulse train command interface and 22-bit absolute encoder compatibility, designed for single-axis positioning and speed control applications. Available now at Atlantech Drives with worldwide express delivery and 12-month warranty — complete our quote form for pricing and availability.
What Is the Mitsubishi MR-JE-70A?
The MR-JE-70A is the 750 W model of the MELSERVO-JE -A sub-series, delivering significantly higher torque output than the 200 W MR-JE-20A while sharing the same command interface architecture — analogue ±10 V DC and pulse train (open collector up to 200 kpps, differential up to 4 Mpps). The -70 suffix denotes the 700 W class, with a rated output of 750 W and a rated current of 5.0 A on single-phase or three-phase 200–240 V AC input. At this power level, three-phase input is strongly recommended to balance supply loading and reduce input current ripple compared to single-phase operation. Compatible motors are the HG-KN73 and HG-SN series at the 750 W rating — the larger motor frame size versus the 200 W HG-KN23 must be accounted for in the mechanical design.
Key Technical Specifications
- Rated output: 750 W
- Rated voltage: 200–240 V AC, 1-phase or 3-phase, 50/60 Hz
- Rated current: 5.0 A (3-phase input)
- Command interface: Analogue (±10 V DC), pulse train (open collector / differential line driver)
- Encoder compatibility: 22-bit absolute encoder (4,194,304 pulses/rev)
- Control modes: Position, speed, torque, position/speed switching
- Maximum instantaneous torque: 300%
- Built-in regenerative resistor: Yes (with external resistor option)
- Dynamic brake: Built-in
- Communication: USB (MR Configurator2)
- Compatible motors: HG-KN73, HG-SN series (750W)
- Enclosure: Open chassis (IP00), panel-mount
- Operating temperature: 0 to 55°C
- Dimensions (W × H × D): 55 × 150 × 170 mm
Typical Industrial Applications
The MR-JE-70A at 750 W covers a broad range of single-axis positioning and speed control tasks in general industrial machinery where the higher cost of the MR-J4-70A with SSCNET III/H is not justified by the application requirements. Representative deployments include: X-Y table positioning systems on engraving, cutting, and dispensing machines where independent pulse train commands from a QD75MH or FX5-40SSC-S positioning module control each axis; rotary indexing systems where a pulse train from a cam controller drives the MR-JE-70A to position a dial plate to successive stations at high repeatability; conveyor registration and web tension systems using analogue speed command from a process controller, with the MR-JE-70A’s speed control mode providing precise web speed matching; and labelling and marking machines requiring high-dynamic response for short-travel, high-cycle positioning moves where the 750 W power rating provides adequate torque reserve for fast acceleration with moderate-inertia loads. The 300% instantaneous torque capability ensures robust acceleration performance during high-cycle duty without amplifier trip on overload during the acceleration phase.
Expert Tips
- At 750 W, the MR-JE-70A’s built-in regenerative resistor handles moderate regenerative braking duty. For applications with frequent rapid deceleration from high speed — such as high-cycle pick-and-place or short-travel indexing — monitor the regenerative load ratio (parameter display in MR Configurator2 → Diagnosis → Regenerative Load Ratio) during commissioning. If the ratio regularly exceeds 80%, connect an external regenerative resistor (MR-RB032 or MR-RB12) to the P+ and C terminals to provide additional energy dissipation capacity.
- When using the MR-JE-70A in position control mode with differential pulse train input (4 Mpps maximum), use a line driver output positioning module rather than an open collector output to maximise pulse transmission reliability over cable runs exceeding 2 m. Open collector pulse signals at 200 kpps are susceptible to noise-induced false pulses on cables longer than 2 m in electrically noisy environments — switching to differential line driver eliminates this vulnerability.
- The MR-JE-70A supports in-position output (INP signal on CN1) which goes active when the position error falls within the in-position range set by parameter PA10. Set PA10 to the minimum value that the mechanical system can consistently achieve — an excessively tight in-position range causes the INP signal to oscillate during settling, which can falsely trigger downstream motion commands in the host controller ladder program.
- For vertical axis applications (Z-axis, elevator), configure the electromagnetic brake interlock (parameter PD01, bit 2) to ensure the motor brake engages before the servo enable (SON) signal is removed — without this interlock, the axis may drop by several millimetres during the transition from servo-on to brake-engaged, which is unacceptable for precision vertical positioning systems.
Frequently Asked Questions
Q: What is the key difference between MR-JE-70A and MR-J4-70A?
A: The MR-J4-70A supports SSCNET III/H fibre-optic network communication for multi-axis synchronised motion control via a Mitsubishi motion CPU, in addition to the analogue/pulse interface. The MR-JE-70A supports analogue/pulse interface only and cannot be connected to a SSCNET III/H network. For standalone single-axis applications with pulse train or analogue command, the MR-JE-70A is the cost-effective choice; for multi-axis synchronised motion requiring a motion CPU, specify the MR-J4-70A or MR-J4-70B.
Q: Can the MR-JE-70A be operated on single-phase 200 V AC supply?
A: Yes, single-phase 200–240 V AC input is supported. However, at 750 W output, single-phase input draws significantly higher peak current than three-phase input and increases supply loading asymmetry. Mitsubishi recommends three-phase input for the MR-JE-70A and above where three-phase supply is available. If single-phase must be used, ensure the supply circuit breaker and wiring are rated for the higher single-phase input current specified in the MR-JE instruction manual.
Q: Is the MR-JE-70A compatible with the same MR Configurator2 software version as the MR-JE-20A?
A: Yes. MR Configurator2 supports all models within the MELSERVO-JE series using the same software installation. Connect via USB to the CN5 connector on either model — the software automatically detects the connected amplifier model and loads the appropriate parameter set and display screens.
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