Mitsubishi MR-J3-10A-S030 MELSERVO-J3 AC Servo Drive 100W
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Product Information
The Mitsubishi Electric MR-J3-10A-S030 is a 100 W AC servo drive from the MELSERVO-J3 series, engineered for high-precision motion control applications. Operating on a main supply voltage range of 200 V AC to 230 V AC (1-phase or 3-phase, 50/60 Hz) with an allowable operating window of 170 V AC to 253 V AC, this compact amplifier delivers a rated output current of 1.1 A. It utilizes a sine wave PWM current control system and supports high-resolution 18-bit absolute and incremental encoder feedback, providing 262,144 pulses per revolution. This resolution ensures high positioning accuracy, low torque ripple, and smooth velocity regulation across demanding automation equipment such as pick-and-place units, packaging systems, and semiconductor assembly machinery.
Physical integration into control cabinets is handled through dedicated interface connectors, including a 50-pin CN1 port for command signals and digital I/O, a 10-pin CN2 port for motor encoder feedback, and RS-422/RS-232C serial connectors (CN3/CN4) for setup and multi-drop network connectivity. The unit accepts general-purpose pulse train and analog voltage command inputs. Commissioning a replacement drive requires transferring stored parameter sets from non-volatile EEPROM memory using Mitsubishi MR Configurator or MR Configurator2 setup software, or the MR-PRU03 handheld parameter unit. Because the -S030 modification designation indicates special OEM parameter defaults or custom software routines, verifying parameter settings prior to starting the axis is essential. ABC Industrial Parts can assist in sourcing fully tested replacement drives and transferring operational parameter profiles.
Diagnostic monitoring is available directly on the front panel via an integrated red 5-digit 7-segment LED display. This display provides real-time operational status indications (such as 'b01' for ready and 'c00' for servo ON), parameter values, active alarm codes ('AL.XX'), and warning indicators ('AL.EX'), with internal memory retaining a historical log of up to six past alarm occurrences. First-line troubleshooting involves checking input supply voltage, control circuit power, and encoder cable shielding against electrical interference. Internal hardware issues—such as RAM faults (AL.12), EEPROM checksum failures (AL.15), CPU board errors (AL.17), or shorted IPM power modules (AL.24/AL.32)—are not field-repairable and require internal repair or unit replacement. Sourcing a tested exchange unit through ABC Industrial Parts provides a fast route to resuming production.
Technical Specifications
| Manufacturer | Mitsubishi Electric |
| Part Number | MR-J3-10A-S030 |
| Model / Type | MR-J3-10A |
| Product Family | MELSERVO-J3 |
| Component Type | AC Servo Drive |
| Rated Output Power | 0.1 kW (100 W) |
| Rated Output Current | 1.1 A |
| Supply Voltage | 200–230 V AC (1-phase / 3-phase, 50/60 Hz) |
| Minimum Supply Voltage | 170 V AC |
| Maximum Supply Voltage | 253 V AC |
| Control Method | Sine wave PWM control / current control system |
| Encoder Resolution | 18-bit (262,144 pulses/rev) |
| Serial Interface | RS-422 / RS-232C |
| Command Inputs | Pulse train / Analog voltage |
| Memory Type | Non-volatile EEPROM |
Programming and Configuration
Parameter configuration and axis setup for the MR-J3-10A-S030 are performed using Mitsubishi software setup tools, including MR Configurator and MR Configurator2 via serial communication, or through the portable MR-PRU03 handheld parameter unit. Operating settings, gain parameters, command modes, and alarm thresholds are written to non-volatile EEPROM storage, which preserves all configuration data during power shutdowns without requiring battery backup.
The -S030 suffix denotes a specific OEM variation containing factory default parameter adjustments or customized software routines tailored for specialized equipment. When installing a spare unit, technicians must extract parameter data from the original drive or load a saved project file matching the machine builder's requirements. Restoring these parameter files ensures proper digital I/O assignment, gain tuning, and feedback scaling across the axis.
Communication and System Integration
System connectivity for the MR-J3-10A-S030 centers on a 50-pin CN1 multi-function interface connector, which processes pulse train command signals (pulse/direction or differential inputs) and analog voltage signals for speed and torque regulation. High-resolution encoder signals interface through the 10-pin CN2 connector, establishing serial feedback loop closure with 18-bit encoders.
Serial communications are handled via dedicated CN3 and CN4 ports operating under RS-422 or RS-232C protocols. These connections enable point-to-point communication with a setup PC or multi-drop networking configurations across several MELSERVO-J3 amplifiers. Real-time parameter monitoring, drive diagnostics, and error logging can be executed through these serial channels.
Diagnostics and Status Indication
The MR-J3-10A-S030 includes on-board status and fault diagnostic capabilities. Operating modes, parameter indices, system monitor values, active alarms ('AL.XX'), and warning codes ('AL.EX') display directly on the integrated 5-digit 7-segment display on the front faceplate. Internal non-volatile memory logs up to six past alarm occurrences for post-fault analysis.
Comprehensive diagnostic routines can also be performed via software connected through the CN3 serial port. MR Configurator2 provides real-time monitoring of drive parameters, axis velocity, current draw, I/O states, and alarm history records.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| 5-digit 7-segment LED Display | Red - Numeric / Alphanumeric display | Displays operational status (e.g. 'b01' ready, 'c00' servo ON), parameter numbers, monitor values, active alarms ('AL.XX'), and warnings ('AL.EX') |
Replacement and Spare Part Considerations
The MELSERVO-J3 series was officially discontinued on May 31, 2019. When replacing an installed MR-J3-10A-S030 drive, confirm that the exact part number including the -S030 suffix is ordered. Standard MR-J3-10A drives may not include the specialized default parameters or software adjustments supplied for OEM-specific machine functions.
The MR-J3-10A-S030 pairs directly with 100 W Mitsubishi AC servo motors, including the HF-KP13 and HF-MP13 series. For facility upgrades or complete system migrations, the successor generation is the MELSERVO-J4 series (MR-J4-10A). Transitioning to an MR-J4 drive requires conversion cable adapters to interface with existing machine wiring and feedback connections.
Before powering on a replacement drive, ensure that motor connections (U, V, W phases) are verified and parameter configurations match the host equipment requirements. Running an unconfigured drive can result in phase errors (AL.51) or position deviation faults (AL.52).
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| AL.10 | Undervoltage | Main circuit power supply voltage dropped below allowable limit. | Main power supply voltage too low, instantaneous power interruption, insufficient power supply capacity. | Check main power supply line voltage, inspect power wiring and contactors. |
| AL.12 | Memory error 1 (RAM error) | Internal RAM read/write error detected. | Internal hardware failure on control circuit board. | Internal hardware fault — turn power off and on again. If fault persists, replace the servo amplifier. |
| AL.13 | Clock error | Internal clock oscillator hardware error. | Internal control printed circuit board component failure. | Internal hardware fault — turn power off and back on. If fault recurs, replace the servo amplifier. |
| AL.15 | Memory error 2 (EEPROM error) | EEPROM write or checksum data error. | EEPROM defect or interruption during parameter write. | Re-initialize parameters. If fault persists, internal hardware is damaged — replace the servo amplifier. |
| AL.16 | Encoder error 1 (Communication error) | Serial communication error between encoder and servo amplifier. | Encoder cable loose or broken, noise interference, faulty encoder. | Check encoder cable connection and shielding, replace cable or servo motor if defective. |
| AL.17 | Board error | Internal CPU or board circuit defect. | Internal hardware control circuit failure. | Internal hardware fault — return unit for repair or replace the servo amplifier. |
| AL.19 | Memory error 3 (Flash ROM error) | Flash memory read/write error. | Internal hardware defect. | Internal hardware fault — replace the servo amplifier. |
| AL.20 | Encoder error 2 (Communication initial error) | Encoder initial communication failed during startup. | Incorrect encoder model connected, broken encoder cable, noise. | Verify motor/encoder model compatibility and check encoder wiring. |
| AL.21 | Encoder error 3 (Position error) | Absolute position sensor signal discrepancy detected. | Encoder internal fault or excessive vibration/noise. | Check grounding and noise suppression, replace servo motor if encoder is faulty. |
| AL.24 | Main circuit error | Ground fault or short circuit on output side detected. | Motor UVW output power line grounded/shorted, or damaged IPM module. | Disconnect motor cables and test. If AL.24 occurs with motor disconnected, internal power module is damaged — replace unit. |
| AL.25 | Absolute position erased | Absolute position data in absolute encoder lost. | Encoder battery voltage dropped below required threshold or cable disconnected during power OFF. | Replace encoder battery and perform home position / absolute position initialization procedure. |
| AL.30 | Regenerative option error | Regenerative option transistor or resistor fault. | Incorrect regenerative option setting in parameter PA02, disconnected resistor wire, excessive braking energy. | Check parameter PA02 setting and verify regenerative resistor resistance and wiring. |
| AL.31 | Overspeed | Motor speed exceeded allowable maximum speed. | Speed command signal invalid, servo loop hunting/instability, encoder miswired. | Check speed command line, adjust gain parameters, verify encoder wiring. |
| AL.32 | Overcurrent | Output current exceeded instantaneous overcurrent threshold. | Short circuit in motor cables (U, V, W), damaged IPM power module, unstable gain. | Disconnect motor leads and test. If AL.32 occurs with motor disconnected, replace servo amplifier. Otherwise check motor insulation. |
| AL.33 | Overvoltage | DC bus line voltage exceeded maximum threshold level. | High regenerative energy, disconnected or undersized regenerative resistor, AC input voltage too high. | Check main AC input line voltage, inspect regenerative option wiring, add external braking resistor if necessary. |
| AL.35 | Command pulse frequency error | Command pulse input frequency exceeded allowable limit. | Command pulse input frequency too high, noise on pulse train signal lines. | Reduce command pulse frequency, improve shielding on pulse signal wiring. |
| AL.37 | Parameter error | Parameter setting value out of valid range. | Parameter written outside allowable range or incompatible combination. | Check parameter error number and correct the invalid parameter setting. |
| AL.45 | Main circuit device overheat | Power module (IPM) temperature exceeded safety limits. | Cooling fan defect, restricted airflow, continuous heavy overload operation. | Check cooling fan function, clean heatsink, reduce operating duty cycle. |
| AL.46 | Servo motor overheat | Servo motor thermal sensor activated. | Motor operated beyond continuous torque rating, high motor ambient temperature. | Reduce operating load, verify motor cooling, check ambient conditions. |
| AL.50 | Overload 1 | Continuous torque command exceeded thermal rating limit for prolonged duration. | Mechanical overload, machine sticking or binding, amplifier capacity too small. | Inspect mechanical system for sticking/binding, reduce acceleration/load rate, check motor size. |
| AL.51 | Overload 2 | Instantaneous heavy load / locked rotor condition detected. | Mechanical jam/collision, motor power phase UVW wiring reversed. | Check motor UVW wiring sequence, clear mechanical obstruction. |
| AL.52 | Error excessive | Position deviation counter exceeded parameter setting limit (parameter PC01). | Acceleration rate too steep, torque limit active, load jam, wrong motor wiring phase. | Check UVW phase wiring, increase position error limit parameter, check torque limit parameters. |
| AL.88 | Watchdog error | Internal watchdog CPU monitoring timer timeout. | High electrical noise interference or control board component failure. | Internal hardware fault — power cycle unit and ensure proper grounding. If error persists, replace servo amplifier. |
| AL.E6 | Servo emergency stop warning | Emergency stop input (EMG) opened. | Emergency stop button engaged or EMG input circuit disconnected. | Check emergency stop external circuit and reset emergency switch. |
| AL.E9 | Main circuit off warning | Main circuit power turned off while servo-on (SON) signal active. | Main AC supply lost while servo was enabled. | Turn off SON signal before removing main power supply. |
Frequently Asked Questions
Which motor models operate with the MR-J3-10A-S030 servo drive?
The MR-J3-10A-S030 is designed to control 100 W Mitsubishi AC servo motors, specifically the HF-KP13 and HF-MP13 series utilizing 18-bit high-resolution encoders.
What does the -S030 suffix mean on this part number?
The -S030 designation indicates special OEM parameter defaults or custom factory software modifications tailored for specific machinery applications.
How are parameter settings configured on the MR-J3-10A-S030?
Parameters are managed using Mitsubishi MR Configurator or MR Configurator2 software via serial connection, or through the portable MR-PRU03 handheld parameter unit, and stored in non-volatile EEPROM.
What is the recommended replacement path for a discontinued MELSERVO-J3 drive?
The direct successor is the MELSERVO-J4 series model MR-J4-10A, which can replace the MR-J3-10A-S030 when paired with optional conversion cable adapters for wiring compatibility.
How do I clear diagnostic alarms on the drive?
Active alarms (prefixed with 'AL.') display on the front 5-digit LED screen. After rectifying the root cause noted in the fault log, cycle the main control power off and on to reset the drive error latch.
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