The MR-J3ENCBL5M-A1-H is Mitsubishi Electric’s 5-metre heavy-duty flexible encoder cable with A1-type motor-side connector for connecting MR-J4 and MR-J3 series servo amplifiers to HG-SR, HG-RR, HG-KR, and HG-MR series servo motors — the 5-metre variant of the heavy-duty flex A1 encoder cable, designed for servo axis applications where the motor is installed 2 to 5 metres from the servo amplifier and the cable routing requires heavy-duty flex construction for moving axis energy chain installations or longer fixed routing paths. The MR-J3ENCBL5M-A1-H is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the MR-J3ENCBL5M-A1-H?
The MR-J3ENCBL5M-A1-H is a Mitsubishi Electric servo encoder cable from the MR-J3ENCBL series, providing a 5-metre encoder connection between the servo amplifier’s CN2 encoder port and the servo motor’s A1-type encoder connector for 22-bit absolute position feedback signal transmission. The cable is functionally identical to the MR-J3ENCBL2M-A1-H in construction, connector type, and signal specification — the sole difference is the 5-metre overall length versus 2 metres, extending the motor-to-amplifier installation distance. The 5-metre length covers the majority of machine configurations where the servo panel is mounted separately from the machine structure — a wall-mounted control panel serving a machine bed with motors at distances of 3 to 5 metres is a typical MR-J3ENCBL5M-A1-H application. The heavy-duty «H» construction provides the same energy chain flex rating as the 2-metre variant, enabling the 5-metre cable to be routed through moving cable tracks on longer-travel servo axes such as gantry machines, large-format CNC routers, and long-stroke transfer systems. The amplifier-side CN2 connector mates directly with all MR-J4 and MR-J3 series amplifiers at all power ratings without any additional signal conditioning — the cable’s shielding provides adequate noise immunity at 5 metres to maintain reliable 22-bit encoder signal transmission in electrically noisy machine environments.
Key Technical Specifications
- Model: MR-J3ENCBL5M-A1-H
- Cable Length: 5 metres
- Motor-Side Connector: A1-type (HG-SR, HG-RR, HG-KR, HG-MR series circular encoder connector)
- Amplifier-Side Connector: MR-J3/J4 CN2 20-pin MIL circular connector
- Construction: Heavy-duty flex (H) — rated for moving axis / energy chain installation
- Signal Type: Serial encoder (22-bit absolute, MR-J4/J3 proprietary protocol)
- Compatible Amplifiers: MR-J4-A, MR-J4-B, MR-J3-A, MR-J3-B series (all power ratings)
- Compatible Motors: HG-SR, HG-RR, HG-KR, HG-MR series with A1 encoder connector
- Shielding: Individual pair shielding + overall braid shield
- Operating Temperature: -20°C to 70°C
- Maximum Cable Length (system): Refer to MR-J4 instruction manual (typically 30 m maximum)
Typical Industrial Applications
The MR-J3ENCBL5M-A1-H is the most commonly stocked encoder cable length after the 2-metre variant, covering a broad range of machine configurations where the motor-to-amplifier distance falls in the 2–5 metre range. In CNC machining centres where the servo amplifier panel is mounted at the rear of the machine and the axis motors are on the machine’s working envelope, 5-metre encoder cables typically cover the X-axis (longest horizontal travel) motor connection in machines with bed lengths up to approximately 3 metres. In large-format gantry routers and plasma cutting machines where the servo panel is positioned at one end of the machine and the motors are on the gantry at the far end of the cutting area, the MR-J3ENCBL5M-A1-H covers gantry motor connections for machines up to approximately 4 metres of gantry travel. Multi-axis robotic welding cells where the servo amplifiers are in a floor-standing panel adjacent to the robot base typically use 5-metre cables for the robot axis motors — the cable routes from the panel through the robot’s internal cable management from base to end-of-arm, with 5 metres providing adequate length for most 6-axis robot cable runs from panel to motor. In press brake backstop systems, the 5-metre cable connects the backstop servo amplifier (typically mounted in the press control panel) to the backstop servo motor at the rear of the press where the backstop mechanism is located — distances of 3 to 5 metres are typical for mid-size press brake installations. Conveyor positioning systems with servo drives mounted in a central panel and motors distributed along the conveyor structure at intervals of up to 5 metres from the panel use the MR-J3ENCBL5M-A1-H as the standard encoder cable for the nearest motor positions.
Maintenance Tips
For MR-J3ENCBL5M-A1-H cables installed in energy chains on long-travel axes, the cable’s flex life is determined by the number of bend cycles, the bend radius during operation, and the ambient temperature — higher temperature reduces flex life proportionally. Inspect the cable jacket visually at each annual maintenance interval, focusing on the cable section that experiences the tightest bend during axis travel (typically at the midpoint of the energy chain travel range, where the cable forms a U-bend). Replace the encoder cable at the first sign of jacket cracking or deformation, even if the servo system is still operating without encoder alarms — a cracked jacket allows moisture and coolant penetration to the internal conductors, and conductor corrosion progresses to intermittent AL.16 alarms within weeks of jacket breach in wet machine environments. For the A1 motor-side connector on long-cable-run installations, verify that the cable weight is supported by a cable clamp or strain relief within 150 mm of the connector body — unsupported cable weight on a 5-metre cable generates significant gravitational force on the connector body, accelerating connector fretting wear over months of axis operation. Label the encoder cable at both ends with the axis designation and cable part number at the time of installation — in multi-axis panels with multiple similar encoder cables, unlabelled cables are easily confused during maintenance, leading to incorrect cable reconnection after panel servicing.
Frequently Asked Questions
Q: Can the MR-J3ENCBL5M-A1-H be used as a fixed installation cable (not in an energy chain) for a longer motor-to-panel routing?
A: Yes. The heavy-duty «H» construction is fully compatible with fixed (non-moving) installation — the flex rating is a minimum specification, not a maximum. Using an H-rated cable in a fixed installation provides additional robustness against incidental flexing during installation and maintenance without any disadvantage. For long fixed routing paths up to 5 metres, the MR-J3ENCBL5M-A1-H is appropriate; for fixed routing paths above 5 metres, longer cable variants (10 m, 20 m, 30 m) from the MR-J3ENCBL series should be specified, staying within the maximum cable length specified in the servo amplifier instruction manual.
Q: Does increasing encoder cable length from 2 metres to 5 metres affect the 22-bit encoder signal quality or require any amplifier parameter adjustment?
A: No amplifier parameter adjustment is required when changing encoder cable length within the Mitsubishi-specified maximum cable length. The 22-bit serial encoder communication protocol used by MR-J4 and MR-J3 amplifiers is designed to maintain signal integrity over the full specified cable length range (up to 30 metres maximum depending on the amplifier model) without any additional termination, repeaters, or parameter changes. The cable’s individual pair shielding and overall braid shield provide adequate noise rejection at 5 metres to maintain reliable encoder communication in typical industrial machine environments.
Q: What is the rated flex cycle life of the MR-J3ENCBL5M-A1-H in an energy chain application?
A: Mitsubishi specifies the flex cycle life of H-rated encoder cables in the MR-J3ENCBL series technical data sheet, with the rated cycle life dependent on the bend radius and travel speed of the energy chain application. As a general reference, Mitsubishi H-rated servo cables are designed for millions of flex cycles at the rated minimum bend radius — adequate for typical servo axis cycle rates (1–10 cycles per minute) over 10+ years of machine service. Consult the MR-J3ENCBL series technical data or Mitsubishi’s cable selection guide for the specific cycle life data at the planned installation bend radius.
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