Purchase now: Schneider Electric VW3A5305 Output Filter
Purchase now: Atlantech Drives provides you the Schneider Electric VW3A5305, a specialized **Motor Choke (Output Inductor)** designed for the Altivar range of Variable Speed Drives (VSDs). While the drive controls the speed, this passive component is critical for protecting your motor. It is installed in series between the drive output and the motor. Its primary function is to smooth the current waveform and limit voltage spikes (dV/dt) caused by the high-speed switching of the IGBTs, which can otherwise destroy the insulation of standard AC motors over time.
Technical Specifications and Cable Length Extension
The VW3A5305 is rated for a nominal current of approximately **90 A** (Check drive compatibility, typically used with 30-45kW drives). By dampening the high-frequency harmonics, it reduces the thermal stress on the motor windings and lowers the audible noise generated by the motor. Crucially, it allows you to increase the maximum allowable cable length between the drive and the motor. Without a choke, long cables act as capacitors, amplifying voltage spikes up to 2x the DC bus voltage.
- Part Number: VW3A5305.
- Type: Motor Choke / dV/dt reduction.
- Nominal Current: ~90 A.
- Max Switching Frequency: Check manual (usually 4kHz).
- Protection: IP20.
- Mounting: Panel Mount (Bottom of cabinet).
- Compatibility: ATV61, ATV71, ATV600, ATV900 ranges.
Expert Installation Advice: Where to mount it?
Heat is the enemy. Expert Tip: Output chokes generate significant heat due to the iron core losses. Never mount the VW3A5305 directly below the Variable Frequency Drive (VFD). The rising hot air from the choke will be sucked into the VFD cooling fans, causing the drive to overheat. Always mount it to the side or in a separate ventilated compartment. Also, ensure the PE (Ground) connection is robust, as this component filters high-frequency noise to earth.
Frequently Asked Questions (FAQs)
Q: Is this a «Sine Wave» filter?
A: No. A motor choke (like VW3A5305) reduces voltage spikes but the output is still PWM pulses. A Sine Wave filter creates a pure sine wave but is much larger and more expensive.
Q: When do I absolutely need this?
A: If your motor cable length exceeds 50 meters (unshielded) or 25 meters (shielded), you typically need a motor choke to protect the motor bearings and windings.
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