Mitsubishi HG-SN102J-S100 Replacement/Upgrade for MELSERVO-J4

Product Overview

Mitsubishi HG-SN102J-S100 Replacement/Upgrade for MELSERVO-J4: Seamless Transition from Legacy Servo Systems

The Mitsubishi Electric HG-SN102J-S100 is a high-inertia AC servo motor from the MELSERVO-J4 series, rated at 1kW output power, 3000 rpm rated speed, and IP65 ingress protection. For facilities running aging MELSERVO-J2S, MELSERVO-J3, or early J4 configurations, this unit represents a direct, validated replacement path that eliminates the need for full-line reengineering. Whether your existing motor has reached end-of-life, suffered mechanical failure, or is simply no longer available through standard distribution channels, the HG-SN102J-S100 is engineered to restore production continuity with minimal intervention.

Migration from legacy servo platforms — including discontinued models such as the HC-SFS102 (J2S series) or HC-RFS103 (J3 series) — is straightforward when the replacement motor shares the same shaft diameter, encoder interface, and connector pinout. The HG-SN102J-S100 uses a 22-bit absolute encoder compatible with the MR-J4 series servo amplifier, including the MR-J4-10A and MR-J4-10B amplifier variants. Existing wiring harnesses using the MR-J3BUS fiber optic SSCNET III/H communication cable can typically be retained without modification, significantly reducing retrofit labor time on the shop floor.

For installations where the servo amplifier is mounted in a control cabinet alongside a MELSEC iQ-R series PLC or MELSEC Q series motion controller, the HG-SN102J-S100 integrates directly into the existing axis configuration. No changes to the servo parameter file (*.prm) are required when replacing a same-series motor of identical capacity. Engineers performing the swap can retain their existing GX Works3 or MT Works2 project files, reducing commissioning time to a matter of hours rather than days.

Physical installation compatibility is a key consideration in any servo retrofit. The HG-SN102J-S100 features a standard IEC flange mounting with a 14mm shaft diameter, consistent with the J4 high-inertia motor family. Bolt-hole patterns and overall frame dimensions are preserved across the series, meaning existing motor mounts, couplings, and gearbox interfaces do not require machining or adaptation. The IP65 rating ensures continued suitability for environments with coolant mist, dust, or wash-down exposure — common in CNC machining centers, food processing lines, and automated assembly equipment.

Power supply compatibility is equally important. The HG-SN102J-S100 operates on a three-phase 200–240V AC input via the paired MR-J4 amplifier, consistent with standard industrial panel power distribution. No dedicated transformer or power conditioning equipment is required when replacing a same-capacity J4 or J3 motor in an existing cabinet. The regenerative braking circuit within the MR-J4 amplifier handles energy recovery without additional hardware, provided the existing MR-RB032 regenerative resistor or equivalent is already installed for high-duty-cycle applications.

For multi-axis systems, the HG-SN102J-S100 can be deployed alongside other J4-series motors — such as the HG-KR053J (low-inertia, 500W) or HG-SR352J (medium-inertia, 3.5kW) — within the same SSCNET III/H network without protocol conflicts. This makes it straightforward to replace a single failed axis in a multi-axis gantry, rotary indexer, or servo press without disrupting adjacent axes. The MR-J4W2-22B dual-axis amplifier is also compatible for space-constrained cabinet layouts where individual amplifiers are not practical.

Commissioning after installation follows the standard MR-J4 auto-tuning procedure. The amplifier’s one-touch tuning function automatically identifies the load inertia ratio and adjusts gain parameters, eliminating the need for manual PID tuning in most applications. For systems using a GOT2000 series HMI (such as the GT2710-VTBA) connected via Ethernet or RS-422, no screen project modifications are required — the servo axis simply reappears on the network under its original station address.

Procurement lead times for the HG-SN102J-S100 from standard distribution channels can extend to 8–16 weeks during periods of supply constraint. TOPNLMS maintains verified stock of this model, enabling same-week dispatch for urgent replacement orders. Each unit undergoes pre-shipment functional verification, and all motors are supplied with original Mitsubishi Electric packaging and documentation. Export-compliant shipping is available to most industrial markets, with DHL Express and FedEx International Priority options for time-critical orders.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete servo axis replacement typically involves more than the motor itself. When upgrading from a J2S or J3 platform to J4, the MR-J4-10A servo amplifier is the required drive unit, replacing the older MR-J2S-10A or MR-J3-10A. The SSCNET III/H fiber optic communication cable — such as the MR-J3BUS05M-A — connects the amplifier to the motion controller and can often be reused from the existing installation. For cabinet power distribution, the MR-PWS1CBL3M-A1-H power supply cable ensures correct phasing and grounding to the new amplifier.

In multi-axis configurations, the MR-J4W2-22B dual-axis amplifier reduces panel footprint when two 1kW axes share a single drive unit. For systems requiring battery-backed absolute position retention during power-off, the MR-BAT6V1SET battery unit mounts directly to the MR-J4 amplifier. Where signal isolation between the servo network and the PLC I/O bus is required — particularly in older cabinets with mixed 24VDC and analog signal wiring — a signal isolator module such as the MELSEC AX40Y80ZR4 can be inserted without modifying the main control program. Finally, for on-site commissioning and parameter backup, the MR Configurator2 software paired with a USB-to-serial programming cable provides full access to amplifier diagnostics, gain tuning, and alarm history.

Retrofit Guidance FAQ

Q: Can I reuse my existing wiring harness from a J2S installation?
A: The encoder connector pinout differs between J2S and J4 series. A Mitsubishi-approved encoder cable adapter (MR-J2S-J4HCBL03M or equivalent) is required. Power wiring can typically be reused if the cable gauge and connector housing are compatible with the MR-J4 amplifier terminals.

Q: Do I need to modify my GX Works3 motion program?
A: No, provided the replacement motor is the same capacity and series. The axis parameters (inertia ratio, electronic gear ratio) may need re-tuning via auto-tune after installation, but the program logic itself does not require changes.

Q: Is SSCNET III/H backward compatible with SSCNET III?
A: SSCNET III/H is not directly backward compatible with SSCNET III at the protocol level. If your motion controller uses SSCNET III (e.g., Q172DCPU), an amplifier upgrade to MR-J4 also requires a controller upgrade to the iQ-R or Q173DSCPU platform, or use of the MR-J4-GF gateway unit.

Q: Will the motor fit in the same physical space?
A: Yes. The HG-SN102J-S100 shares the same IEC flange dimensions and shaft diameter as the HC-SFS102. No mechanical modifications to the machine frame or coupling are required.

Q: What communication protocols are supported?
A: The HG-SN102J-S100 communicates exclusively via SSCNET III/H through the paired MR-J4 amplifier. Analog ±10V and pulse-train interfaces are not supported on this model; those applications require the MR-J4-A amplifier variant.

Warranty Assurance

Every HG-SN102J-S100 unit supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Pre-shipment inspection includes encoder signal verification, insulation resistance testing, and mechanical rotation check. Units are dispatched in original Mitsubishi Electric packaging with full documentation. In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund, with return shipping coordinated by our after-sales team. Our standard response time for warranty claims is within 2 business days. For urgent production-down situations, expedited replacement dispatch is available upon request.

For procurement inquiries, stock availability, or technical pre-sales support, contact our team directly.

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