The MR-JE-20A is a 200 W servo amplifier from Mitsubishi Electric, part of the MELSERVO-JE series — a cost-optimised general-purpose servo amplifier range with analogue/pulse train command interface, designed for positioning and speed control applications where SSCNET III fibre-optic network connectivity is not required. Atlantech Drives holds stock of the MR-JE-20A. Contact us for fast worldwide delivery and competitive pricing.
What Is the Mitsubishi MR-JE-20A?
The MR-JE-20A is the 200 W model of the MELSERVO-JE -A sub-series, accepting analogue speed/torque commands (±10 V DC) and pulse train position commands from a wide range of positioning controllers and motion CPUs. The JE series is positioned between the entry-level MR-J4 in terms of cost and the full-featured MR-J4 in terms of connectivity — it uses the same 22-bit absolute encoder interface as the MR-J4, providing high positioning resolution (4,194,304 pulses/rev) while omitting the SSCNET III/H network capability of the -B suffix J4 amplifiers. Compatible servo motors include the HG-KN and HG-SN series, which are the JE-specific motor families sharing the J4 22-bit encoder hardware.
Key Technical Specifications
- Rated output: 200 W
- Rated voltage: 200–240 V AC, 1-phase or 3-phase, 50/60 Hz
- Rated current: 1.5 A (1-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
- Dynamic brake: Built-in
- Communication: USB (MR Configurator2), RS-422 (optional)
- Compatible motors: HG-KN series, HG-SN series
- Enclosure: Open chassis (IP00), panel-mount
- Operating temperature: 0 to 55°C
- Dimensions (W × H × D): 40 × 150 × 135 mm
Compatibility & System Integration
The MR-JE-20A accepts pulse train position commands via the CN1 connector, compatible with open collector (up to 200 kpps) and differential line driver (up to 4 Mpps) pulse outputs from positioning controllers including the Mitsubishi QD75MH, LD75MH, FX5-40SSC-S, and FX3U-20SSC-H, as well as third-party pulse-output motion controllers. For analogue speed control, connect the ±10 V DC speed reference to the VC and SG terminals and select speed control mode via CN1 input signals (SP1, SP2, SP3 for multi-speed selection). The MR-JE-20A is exclusively compatible with HG-KN and HG-SN series servo motors — it cannot drive HG-MR, HG-SR, HG-KR, or HC-series motors, as these use different motor and encoder connector pinouts. When replacing an MR-J3-20A in an existing installation, note that the MR-JE motor cable connectors differ from MR-J3 — the Mitsubishi MR-EKCBL□M-H cable set is required to adapt existing MR-J3 motor wiring to MR-JE amplifier connectors. Absolute position data is retained across power cycles when the MR-JE battery (MR-BT6V1SET) is installed on the CN4 connector — without the battery, the amplifier operates in incremental mode and requires homing at each power-up.
Replacement & Upgrade Notes
- The MR-JE-20A is a cost-effective replacement for the MR-J3-20A in applications using pulse train or analogue command interfaces, provided the motor is also upgraded to the HG-KN23 (200 W JE-compatible motor). Direct motor substitution without cable and motor replacement is not possible due to encoder interface differences between J3 and JE generations.
- When upgrading from MR-J3-20A to MR-JE-20A, re-tuning of servo gains is required — the JE amplifier’s auto-tuning (one-touch tuning via MR Configurator2) should be performed with the actual load connected after mechanical installation is complete. Gains optimised for the MR-J3 will not transfer directly and will typically produce either excessive overshoot or sluggish response if applied without re-tuning.
- For applications currently using MR-J2S-20A amplifiers, the upgrade path to MR-JE-20A requires both amplifier and motor replacement (the J2S uses a 17-bit encoder incompatible with JE motor families) as well as parameter re-entry — the MR-J2S parameter numbering is entirely different from the JE series. Use the MR-JE-20A parameter conversion table in the MELSERVO-JE transition guide to map J2S parameters to their JE equivalents.
- The MR-JE series does not support multi-axis SSCNET III/H network communication. If the application later requires synchronised multi-axis motion over a fibre-optic network, the MR-J4-20B is the upgrade path — plan for this possibility at the system design stage if multi-axis expansion is anticipated.
Frequently Asked Questions
Q: Can the MR-JE-20A be used with HG-KR series motors?
A: No. The HG-KR series is compatible with MR-J4 amplifiers only. The MR-JE series requires HG-KN or HG-SN series motors. Although the HG-KR and HG-KN share the same 22-bit encoder technology, the motor connector pinouts and cable specifications differ — using an HG-KR motor with an MR-JE amplifier will result in encoder communication faults and will not function.
Q: Does the MR-JE-20A support absolute position detection without a battery?
A: No. Absolute position retention across power cycles requires the MR-BT6V1SET battery unit connected to CN4. Without the battery, the amplifier initialises the encoder in incremental mode at each power-up and a zero-return (homing) operation is required before positioning can begin.
Q: What software is used to configure and tune the MR-JE-20A?
A: MR Configurator2 is the standard configuration and tuning software for the MR-JE series, connected via USB to the amplifier’s CN5 (USB) connector. MR Configurator2 provides parameter setting, one-touch auto-tuning, test operation (JOG, positioning), and real-time oscilloscope functions for servo response analysis. The software is available as a free download from the Mitsubishi Electric FA website.
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