The MR-J3ENCBL5M-B1-H is Mitsubishi Electric’s 5-metre heavy-duty flexible encoder cable with B1-type motor-side connector for connecting MR-J4 and MR-J3 series servo amplifiers to HG-SR and HG-RR series servo motors equipped with the B1-type encoder connector — the 5-metre B1-connector variant of the heavy-duty flex encoder cable, designed for installations where the motor-to-amplifier distance is between 2 and 5 metres and the specific servo motor model requires the B1 physical encoder connector interface. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the MR-J3ENCBL5M-B1-H?
The MR-J3ENCBL5M-B1-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 B1-type encoder connector for 22-bit absolute position feedback signal transmission. The «5M» length distinguishes this cable from the 2-metre MR-J3ENCBL2M-B1-H, providing the additional reach required for servo panel installations serving motors mounted 3 to 5 metres from the control panel. The B1 motor-side connector addresses specific HG-SR and HG-RR motor models whose encoder connector uses the B1 physical interface — typically larger-frame motor models in the HG-SR and HG-RR series. The amplifier-side connector is the identical 20-pin MIL CN2 connector used across the entire MR-J3ENCBL cable range, maintaining compatibility with all MR-J4 and MR-J3 series amplifiers regardless of power rating. The heavy-duty «H» construction provides the same energy chain flex rating as all MR-J3ENCBL-H variants — individually shielded signal pairs with stranded conductors and a robust outer jacket suitable for repeated bending in moving cable track installations on servo axes with travel distances up to approximately 5 metres per axis.
Key Technical Specifications
- Model: MR-J3ENCBL5M-B1-H
- Cable Length: 5 metres
- Motor-Side Connector: B1-type (specific HG-SR, HG-RR larger-frame motor 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 series models with B1-type encoder connector (verify per motor model)
- Shielding: Individual pair shielding + overall braid shield
- Operating Temperature: -20°C to 70°C
- Maximum System Cable Length: Per MR-J4 instruction manual (typically 30 m maximum)
Architecture & Design Overview
The MR-J3ENCBL5M-B1-H implements the same cable architecture as all MR-J3ENCBL-H series cables — a multi-pair construction with individual twisted-pair shielding for each signal pair and an overall braid shield covering the complete cable assembly. The individual pair shielding is critical for 22-bit serial encoder signal integrity: the encoder communication protocol uses high-speed serial data transmission at a clock rate that is susceptible to crosstalk between adjacent signal pairs if only an overall shield is used. The individual pair shielding attenuates inter-pair crosstalk to negligible levels, maintaining clean serial data transitions even over 5-metre cable runs in the electrically noisy environment of a servo motor drive system. The outer jacket of the H-rated cable uses a thermoplastic elastomer (TPE) or equivalent compound that retains flexibility at low temperatures (rated to -20°C) while providing resistance to the cutting fluid splash, coolant mist, and lubricant vapours present in machine tool environments. The stranded conductor construction within each signal pair — as opposed to solid conductors used in fixed-wiring applications — distributes mechanical flexing stress across multiple strand wires, distributing fatigue across all strands rather than concentrating it in a single conductor. This stranded construction provides the flex cycle life appropriate for energy chain servo cable applications. The amplifier-side 20-pin MIL connector uses a bayonet locking mechanism providing positive locking confirmation — the connector cannot be partially mated without obvious mechanical resistance, reducing the risk of intermittent contact from incompletely mated connectors that is a common cause of spurious AL.16 encoder alarms in servo systems.
Expert Tips
When specifying the MR-J3ENCBL5M-B1-H for a gantry or long-travel axis with a cable energy chain, calculate the actual cable length needed for the energy chain installation before ordering — the cable must be long enough to reach from the amplifier panel to the motor at the furthest end of the axis travel, accounting for the cable’s path length through the energy chain (which is longer than the straight-line distance between panel and motor due to the energy chain’s U-bend). A common calculation error is to measure only the straight-line motor-to-panel distance rather than the actual cable path length, resulting in a cable that is too short to complete the installation. Add a minimum of 500 mm to the calculated cable path length for terminal connections at each end — do not pull the cable taut in the energy chain, as cable tension under load causes accelerated conductor fatigue at the bend point. For the B1 motor-side connector, verify the locking mechanism engagement force before leaving the installation — the B1 connector’s locking ring or latch should require deliberate force to disengage, not a light finger touch. A B1 connector that releases too easily indicates either incorrect locking engagement during installation or a damaged locking mechanism that will allow the connector to work loose during axis vibration. For long-travel axes where the 5-metre cable runs the full length of the energy chain, inspect the cable at the energy chain’s stationary end first during troubleshooting of intermittent encoder errors — the stationary end connection point experiences the highest vibration coupling from the machine structure, and the connector-to-cable strain relief at this end is more susceptible to loosening than the moving end connector.
Frequently Asked Questions
Q: Can the MR-J3ENCBL5M-B1-H be used in a vertical axis energy chain where the cable hangs downward from the amplifier to the motor?
A: Yes. The MR-J3ENCBL5M-B1-H can be installed in vertical axis cable tracks where the cable hangs or travels vertically. For vertical energy chain installations, ensure the cable weight is supported by a cable clamp at the top of the cable run (at the fixed end of the energy chain) rather than being suspended entirely from the connector body — 5 metres of servo cable has significant weight that, if unsupported, applies sustained tensile load to the connector, accelerating connector body fatigue. Use a dedicated cable clamp bracket rated for the cable weight at the fixed mounting point.
Q: Is the 5-metre MR-J3ENCBL5M-B1-H suitable for J3 compatibility mode applications where an HG-SR motor replaces a legacy HC-SFS motor?
A: Yes. When replacing a legacy HC-SFS motor (J3-era, with B1 connector in larger frames) with a current-generation HG-SR motor of the same frame size in J3 motor compatibility mode, the MR-J3ENCBL5M-B1-H provides the correct encoder cable if the installation requires 5 metres of cable reach. The B1 motor-side connector is compatible with both the original HC-SFS B1 connector (J3-era) and the HG-SR B1 connector (J4-era) on matching frame size motors — verify the specific motor connector type against the B1 specification in the motor hardware manual before finalising the cable selection.
Q: Does the MR-J3ENCBL5M-B1-H require a dedicated cable conduit when routed alongside motor power cables over 5 metres?
A: A dedicated conduit is not mandatory but is strongly recommended for 5-metre runs alongside motor power cables. The MR-J3ENCBL5M-B1-H’s individual pair shielding and overall braid shield provide adequate interference rejection at 5 metres when the cable is routed with a minimum separation of 150 mm from the motor power cable. If conduit routing forces the encoder cable into close proximity with motor power cables over the full 5-metre run, the motor power cable’s IGBT-switched voltage transients may exceed the encoder cable shielding’s rejection capability — in this case, a dedicated metal conduit for the encoder cable provides additional shielding.
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