The MR-PWS1CBL1M-A1-H is Mitsubishi Electric’s 1-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 1-metre power cable in heavy-duty flex construction suitable for moving axis energy chain applications. Available now at Atlantech Drives with worldwide express delivery and 12-month warranty — complete our quote form for pricing and availability.
What Is the MR-PWS1CBL1M-A1-H?
The MR-PWS1CBL1M-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 power connector. The «PWS1» designation identifies the power cable series for HG-series motors; «CBL» indicates a pre-fabricated cable assembly with moulded connectors at both ends; «1M» specifies the 1-metre cable length; «A1» identifies the A1-type motor-side power connector compatible with HG-SR, HG-RR, HG-KR, and HG-MR series motors in the small-to-medium frame size range; and «H» designates heavy-duty flex construction rated for energy chain moving axis installation. The cable carries the pulsed IGBT motor drive voltage from the servo amplifier to the motor windings — the voltage waveform on the power cable is a PWM-modulated approximation of sinusoidal AC at the commanded frequency, with peak voltage approaching the amplifier’s DC bus voltage (approximately 300 V for 200 VAC systems) and high dV/dt switching transitions from the IGBT switching events. The 1-metre length is the shortest standard length in the MR-PWS1CBL range, appropriate for compact installations where the motor is mounted in close proximity to the amplifier or where the motor-to-amplifier distance is minimised by mounting the amplifier directly on the machine structure near the motor.
Key Technical Specifications
- Model: MR-PWS1CBL1M-A1-H
- Cable Length: 1 metre
- Motor-Side Connector: A1-type (HG-SR, HG-RR, HG-KR, HG-MR series 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
- Compatible Motors: HG-SR, HG-RR, HG-KR, HG-MR series with A1 power connector (small/medium frame)
- Shielding: Overall braid shield (motor power cable EMI containment)
- Operating Temperature: -20°C to 70°C (check derating above 40°C continuous)
Compatibility & System Integration
The MR-PWS1CBL1M-A1-H is compatible with the MR-J4 and MR-J3 series servo amplifiers across all power ratings that use the CN2 motor output connector format matched by the MR-PWS1CBL series — from the smallest MR-J4-10A/B (100 W) to the mid-range amplifier models. For larger-frame HG-SR, HG-RR, and HG-UR series motors above approximately 3.5 kW that use a different (larger) power connector designation (B1 or other), the MR-PWS1CBL1M-A1-H motor-side connector is incompatible — verify the specific motor model’s power connector type in the HG-series hardware manual before ordering. The MR-PWS1CBL series covers a range of lengths (1 m, 2 m, 5 m, 10 m, 20 m) and connector types (A1, B1) to address different installation requirements — the 1-metre A1-H is the shortest variant, appropriate for the tightest motor-to-amplifier spacing configurations. The MR-PWS1CBL1M-A1-H’s overall braid shield contains the electromagnetic emissions from the PWM-switched motor current waveform — connecting the shield’s drain wire to the amplifier’s PE (protective earth) terminal and the motor’s PE terminal at both ends of the cable creates a closed EMI containment loop that reduces radiated interference from the motor power cable. For installations where the motor power cable must be routed near encoder cables or signal cables, the MR-PWS1CBL’s shielding reduces EMI coupling into sensitive signal cables — but maintaining at least 150 mm physical separation between power and signal cables remains the recommended installation practice even with a shielded power cable.
Replacement & Upgrade Notes
The MR-PWS1CBL1M-A1-H is a consumable component with a finite flex cycle life in moving axis energy chain applications — motor power cables in high-cycle servo axes experience more mechanical fatigue per operating hour than encoder cables due to their larger conductor cross-section and stiffer construction. Plan motor power cable inspection and replacement as part of the servo system’s preventive maintenance programme, with inspection intervals proportional to the axis cycle rate. For MR-J3-era installations using older MR-PWSCBL series motor power cables (the J3-era predecessor to the MR-PWS1CBL series), the motor-side connector type must be verified against the specific motor model before specifying the MR-PWS1CBL1M-A1-H as a replacement — if the J3-era installation used a different motor power cable series with a different motor-side connector, direct substitution with the MR-PWS1CBL1M-A1-H may require connector verification. For servo system upgrades from MR-J3 to MR-J4 where the servo motor is being retained (J4 motor compatibility mode), the existing motor power cable can typically be reused if it is in good condition — the MR-J4 amplifier’s CN2 motor output connector is compatible with the same motor power cable used with the MR-J3 amplifier for the same motor. New motor power cables (MR-PWS1CBL1M-A1-H) should be specified when the motor is also being replaced (new HG-series motor replacing old HC-series motor) or when the existing cable is degraded.
Frequently Asked Questions
Q: Why is a 1-metre motor power cable specified rather than making a longer cable and coiling the excess?
A: Coiling excess motor power cable creates an inductance loop that can cause resonance at specific frequencies in the servo drive’s output current control loop, potentially causing servo instability or increased EMI emissions. The coiled cable also acts as an antenna that increases radiated emissions from the motor power circuit. Always use the shortest cable length appropriate for the installation distance — specify the MR-PWS1CBL1M-A1-H when the actual motor-to-amplifier cable path is 1 metre or less, and the MR-PWS1CBL2M-A1-H (2 metres) when the path is 1 to 2 metres.
Q: Can the MR-PWS1CBL1M-A1-H be used with both MR-J4-A (pulse train) and MR-J4-B (SSCNET III/H) amplifiers?
A: Yes. The motor power cable connection is independent of the amplifier’s command interface type — the MR-PWS1CBL1M-A1-H connects to the amplifier’s CN2 motor output connector, which is standardised across both MR-J4-A (pulse train) and MR-J4-B (SSCNET III/H) variants. The command interface (pulse train or SSCNET) only affects the CN1 command input connection, not the motor power output connection.
Q: What motor power cable cross-section is used in the MR-PWS1CBL1M-A1-H, and is it adequate for all compatible motor power ratings?
A: The MR-PWS1CBL series uses conductor cross-sections selected by Mitsubishi to match the rated current of the compatible motor frame sizes — small-frame motors (100 W to 750 W) use smaller conductors than medium-frame motors (1 kW to 3.5 kW). The MR-PWS1CBL1M-A1-H’s conductor cross-section is specified in Mitsubishi’s cable technical data for the applicable motor frame size range. At 1 metre cable length, the voltage drop across the motor conductors is negligible regardless of motor rating, so the 1-metre cable’s conductor adequacy is determined by current rating rather than voltage drop — verify the cable’s rated continuous current against the motor’s rated current in the hardware manual.
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