The MR-J4ENCBL5M-A1-H is Mitsubishi Electric’s 5-metre heavy-duty flexible encoder cable with A1-type motor-side connector from the MR-J4ENCBL series — the 5-metre variant of the current-generation MR-J4 encoder cable for HG-SR, HG-RR, HG-KR, and HG-MR series servo motors, designed for MR-J4 servo axis installations where the motor-to-amplifier distance falls in the 2 to 5 metre range and the cable routing requires heavy-duty flex construction for energy chain or repeated-flexing moving axis installations. The MR-J4ENCBL5M-A1-H is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the MR-J4ENCBL5M-A1-H?
The MR-J4ENCBL5M-A1-H is a Mitsubishi Electric servo encoder cable from the MR-J4ENCBL series, providing a 5-metre encoder connection between MR-J4 series servo amplifiers and HG-series servo motors with A1-type encoder connectors for 22-bit absolute position feedback signal transmission. The 5-metre length extends the motor-to-amplifier reach compared to the MR-J4ENCBL2M-A1-H, covering the broader range of machine configurations where the servo panel is positioned at a moderate distance from the machine axis motors. The cable is functionally identical to the MR-J4ENCBL2M-A1-H in construction, connector specification, and signal performance — the sole difference is the 5-metre overall length. The heavy-duty «H» construction uses the same individually shielded pairs, stranded conductors, and energy chain-rated outer jacket as the 2-metre variant, providing equivalent flex cycle life at 5 metres when installed within the Mitsubishi-specified minimum bend radius. The amplifier-side connector mates with the MR-J4ENCBL-compatible CN2 port on MR-J4-A and MR-J4-B series amplifiers — verify the specific amplifier model’s CN2 connector type in the amplifier instruction manual before ordering, as the MR-J4ENCBL and MR-J3ENCBL series use different amplifier-side connectors that are physically incompatible.
Key Technical Specifications
- Model: MR-J4ENCBL5M-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-J4ENCBL series CN2 connector (verify per amplifier model)
- Construction: Heavy-duty flex (H) — rated for moving axis / energy chain installation
- Signal Type: Serial encoder (22-bit absolute, MR-J4 proprietary protocol)
- Compatible Amplifiers: MR-J4-A and MR-J4-B series (verify CN2 connector type per model)
- 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 System Cable Length: Per MR-J4 instruction manual (typically 30 m maximum)
Typical Industrial Applications
The MR-J4ENCBL5M-A1-H covers the most common motor-to-amplifier distance range in industrial servo panel installations — 2 to 5 metres — making it the most frequently specified MR-J4ENCBL cable length after the 2-metre variant. In standard 3-axis CNC machining centres where the servo amplifier panel is mounted at the machine rear and the axis motors are on the machine bed and column, 5-metre encoder cables typically serve the longest axis (X-axis on machines with beds up to 3 metres) while shorter cables serve the closer Y and Z axes. In multi-axis SSCNET III/H robot cell installations where the MR-J4-B amplifiers are in a floor-standing panel adjacent to the robot base, 5-metre encoder cables route from the panel through the robot’s internal cable management from the base to the axis motors — adequate for most 6-axis robots where the combined internal cable path from panel to motor does not exceed 5 metres. Automated guided vehicle (AGV) servo drive systems where the MR-J4 amplifiers are mounted on the AGV body and the wheel drive motors are at the AGV axles use 5-metre encoder cables to bridge the distance between the central control cabinet on the AGV and the distributed wheel motors at each axle. Large-format laser engraving and routing machines with servo panels mounted at one end of the machine frame use 5-metre encoder cables for the gantry Y-axis and spindle Z-axis motors located within 5 metres of the panel, while the longer X-axis gantry traverse motor may require a longer cable variant.
Troubleshooting Guide
For MR-J4ENCBL5M-A1-H cables generating AL.16 encoder errors on first installation, the most common cause is incorrect cable series selection — if an MR-J4ENCBL cable is installed in an MR-J4 amplifier that actually requires an MR-J3ENCBL cable, the amplifier-side connector will not physically mate and the encoder circuit will be open, immediately generating AL.16. Verify that the cable physically mates to the amplifier’s CN2 port with the correct locking engagement before powering up — a physically incompatible connector cannot be forced into a correct-looking position. If the cable mates physically but AL.16 persists after initial power-up, check the motor-side A1 connector engagement — the A1 locking ring must be fully rotated to the locked position (the ring should not rotate further when hand-tightened). For intermittent AL.16 on a 5-metre cable that was previously operating correctly, the cable flex section is the most likely failure point — particularly for moving axis applications where the cable has been in energy chain service for several years. Perform a cable wiggle test by manually flexing the cable at 200 mm intervals along the full 5-metre length while monitoring the servo amplifier’s encoder error indicator in MR Configurator2 — if AL.16 triggers at a specific cable position during flexing, the fault location is confirmed and cable replacement is required. For cables in fixed installations that develop intermittent AL.16, inspect the connector bodies at both ends for signs of moisture ingress — the A1 motor-side connector is IP65 rated when correctly mated, but the amplifier-side CN2 connector’s IP rating depends on the amplifier’s installed position and panel sealing.
Frequently Asked Questions
Q: Can the MR-J4ENCBL5M-A1-H replace an MR-J3ENCBL5M-A1-H in an existing MR-J4 installation?
A: Only if the MR-J4 amplifier’s CN2 port is compatible with the MR-J4ENCBL amplifier-side connector — which depends on the specific amplifier model. If the original installation uses an MR-J3ENCBL5M-A1-H successfully, the amplifier’s CN2 port accepts the MR-J3ENCBL connector type, and replacing it with an MR-J4ENCBL5M-A1-H (different amplifier connector) would result in a physically incompatible connection. In this case, the correct replacement is another MR-J3ENCBL5M-A1-H, not the MR-J4ENCBL variant. Match the replacement cable series to the original cable series used in the installation.
Q: Is the 5-metre MR-J4ENCBL5M-A1-H suitable for both fixed and energy chain installations?
A: Yes. The heavy-duty «H» construction is rated for both moving axis (energy chain) and fixed installations — the flex rating is a minimum specification that also provides superior robustness in fixed applications compared to standard non-H cables. For fixed installations, the cable can be routed at bends tighter than the minimum flex bend radius (since repeated flexing is absent), provided the cable is secured without creating localised stress points from cable ties or clamps applied with excessive force.
Q: What causes the MR-J4ENCBL5M-A1-H to show continuity with a multimeter but still generate AL.16 encoder errors at the servo amplifier?
A: Multimeter continuity testing checks only DC conductor continuity — it cannot detect high-frequency signal integrity issues caused by increased conductor resistance from partial strand fatigue, increased pair capacitance from insulation compression, or degraded shield contact resistance from connector fretting. A cable with degraded high-frequency performance may pass DC continuity while failing to transmit the 22-bit encoder’s serial data reliably at the amplifier’s encoder communication data rate. If AL.16 persists after confirming DC continuity, substitute a known-good cable of the same length and route to definitively confirm or rule out cable signal integrity degradation.
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