The MR-PWS1CBL3M-A1-H is Mitsubishi Electric’s 3-metre heavy-duty flexible servo motor power cable with A1-type motor-side connector from the MR-PWS1CBL series — providing the U, V, W three-phase motor power connection between MR-J4 and MR-J3 series servo amplifiers and HG-SR, HG-RR, HG-KR, and HG-MR series servo motors for drive installations requiring a 3-metre power cable reach in heavy-duty flex construction suitable for energy chain moving axis applications. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the MR-PWS1CBL3M-A1-H?
The MR-PWS1CBL3M-A1-H is a Mitsubishi Electric servo motor power cable from the MR-PWS1CBL series, providing the three-phase motor power connection (U, V, W phases plus protective earth) between the servo amplifier’s CN2 motor output terminals and the servo motor’s A1-type power connector. The 3-metre length occupies the mid-range position in the MR-PWS1CBL standard length range — longer than the 1-metre and 2-metre variants to cover motor-to-amplifier distances of 2 to 3 metres, and shorter than the 5-metre and longer variants for greater reach requirements. This 3-metre length is particularly useful in machine configurations where the servo panel is mounted on the machine frame rather than in a separate floor-standing cabinet, reducing the panel-to-motor distance to the 2–3 metre range that the MR-PWS1CBL3M-A1-H covers optimally. The heavy-duty «H» construction uses stranded phase conductors and an outer jacket rated for energy chain flex cycle service — the motor power cable experiences higher mechanical stress than the encoder cable in a moving energy chain installation due to its larger conductor cross-section and stiffer construction, making the «H» rated variant essential for all moving axis power cable applications. The cable carries the IGBT-switched PWM motor drive voltage from the servo amplifier to the motor windings — the pulsed voltage waveform with high dV/dt transitions makes proper cable shielding and routing essential to control EMI radiation and protect adjacent signal cables from conducted interference. The MR-PWS1CBL3M-A1-H is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
Key Technical Specifications
- Model: MR-PWS1CBL3M-A1-H
- Cable Length: 3 metres
- Motor-Side Connector: A1-type (HG-SR, HG-RR, HG-KR, HG-MR series motor power connector — small/medium frame)
- Amplifier-Side Connector: MR-J4/J3 series CN2 motor output connector
- Conductors: 3 × motor phase (U, V, W) + 1 × protective earth (PE)
- Construction: Heavy-duty flex (H) — rated for moving axis / energy chain installation
- Voltage Rating: Rated for servo amplifier output voltage (200 VAC class systems)
- Compatible Amplifiers: MR-J4-A, MR-J4-B, MR-J3-A, MR-J3-B series (all power ratings with A1 motor connector)
- Compatible Motors: HG-SR, HG-RR, HG-KR, HG-MR series with A1 motor power connector (small/medium frame)
- Shielding: Overall braid shield
- Operating Temperature: -20°C to 70°C
Series Comparison & Selection Guide
Within the MR-PWS1CBL-A1-H series, the correct cable length selection is determined by the actual cable routing path length from the servo amplifier’s CN2 motor output to the motor’s power connector — measured along the cable’s routing path (through cable trays, conduit, or energy chain), not the straight-line distance. The MR-PWS1CBL series standard lengths include 1 m (MR-PWS1CBL1M-A1-H), 2 m (MR-PWS1CBL2M-A1-H), 3 m (MR-PWS1CBL3M-A1-H), 5 m (MR-PWS1CBL5M-A1-H), 10 m (MR-PWS1CBL10M-A1-H), and 20 m (MR-PWS1CBL20M-A1-H). The 3-metre MR-PWS1CBL3M-A1-H is the correct selection when the cable routing path is between 2 and 3 metres — specifying a cable longer than necessary and coiling the excess is not recommended, as coiled motor power cable creates an inductance loop that can increase EMI emissions and cause resonance effects in the servo amplifier’s output current control. The A1 motor-side connector is the standard connector for HG-SR, HG-RR, HG-KR, and HG-MR series motors in the small-to-medium frame range — the B1 connector variant (MR-PWS1CBL3M-B1-H) serves larger-frame motor models requiring the B1 power connector. Selecting between the A1 and B1 variants requires checking the specific motor model’s power connector type in the HG-series hardware manual — using the incorrect connector results in a physically incompatible connection that cannot be mated, preventing installation error from reaching the live circuit. For fixed (non-moving) installations where the motor is stationary, both the H (heavy-duty flex) and standard variants of the same length are functionally suitable — the H variant provides additional robustness for incidental flexing during installation and maintenance without any disadvantage.
Maintenance Tips
The MR-PWS1CBL3M-A1-H motor power cable is the highest-stress cable in a servo system installation — the combination of high PWM current, elevated operating temperature, and repeated flexing in energy chain applications makes the motor power cable the most likely cable to require replacement in the system’s service life. For energy chain installations, inspect the motor power cable jacket annually at the cable’s tightest bend position during axis travel — jacket cracking or deformation at the flex point indicates approaching end of flex life, and replacement should be planned before the jacket breach allows coolant or debris to reach the conductor insulation. Measure the cable’s insulation resistance with a 500 V megohmmeter between each phase conductor and the cable shield annually for cables above 5 years of service in high-temperature or contaminated environments — insulation resistance below 10 MΩ indicates insulation degradation requiring cable replacement before conductor-to-shield flashover occurs. For the A1 motor-side power connector, verify the locking ring engagement at each annual maintenance interval and after any maintenance event that required disconnecting the motor power cable — a partially locked A1 connector can vibrate loose during axis operation, causing intermittent power connection loss that manifests as amplifier overcurrent alarms (AL.30 or equivalent) during motor acceleration. The protective earth (PE) conductor in the MR-PWS1CBL3M-A1-H must be connected to the amplifier’s PE terminal and to the motor’s PE terminal at both ends — verify PE conductor continuity with a multimeter at each annual inspection, as a failed PE conductor is a safety hazard that may not generate any servo alarm until a motor insulation fault event.
Frequently Asked Questions
Q: Can the MR-PWS1CBL3M-A1-H be used for both MR-J4-A (pulse train) and MR-J4-B (SSCNET III/H) servo amplifiers?
A: Yes. The motor power cable connection is entirely independent of the servo amplifier’s command interface type — both MR-J4-A and MR-J4-B amplifiers use the same CN2 motor output connector for the motor power connection. The command interface (pulse train vs. SSCNET III/H) affects only the CN1 command input, not the motor power output. The MR-PWS1CBL3M-A1-H is therefore interchangeable between A-suffix and B-suffix MR-J4 amplifiers of the same power rating.
Q: What is the maximum operating temperature of the MR-PWS1CBL3M-A1-H’s outer jacket, and does this limit the motor power the cable can carry?
A: The MR-PWS1CBL3M-A1-H outer jacket is rated for continuous operation up to 70°C ambient. The cable’s conductor current rating is determined by the conductor cross-section and the allowable temperature rise above ambient — at ambient temperatures above 40°C, the continuous current rating may need to be derated to prevent the conductor temperature from exceeding the insulation’s rated limit. For installations where the motor power cable is routed through areas with ambient temperatures above 40°C (near heat sources, within sealed enclosures, or in hot climates without panel cooling), verify the derated current capacity against the motor’s rated current using the cable’s derating curve in Mitsubishi’s cable technical data.
Q: Is it acceptable to use two MR-PWS1CBL series cables in series (connected end-to-end) to extend reach beyond 3 metres?
A: No. Connecting two motor power cables in series using field-made splices or intermediate connectors is not acceptable for servo motor power circuits — the connection point introduces additional impedance, potential arcing risk at the high IGBT-switched currents, and EMI emission from the exposed conductor at the splice. For cable routing distances above 3 metres, specify the MR-PWS1CBL5M-A1-H (5 metres) or longer standard length variants — using a single continuous factory-assembled cable is mandatory for servo motor power connections.
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