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CONTROL TECHNIQUES Servo Drive
Brand: CONTROL TECHNIQUES -
Cat: Servo Drive
Code:SP1401
| Combination name | Availability | Price |
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AC Variable Speed Drive – CONTROL TECHNIQUES SP1401
The SP1401 is an AC variable speed drive (“AC Variable Speed Drive” / inverter) manufactured by Control Techniques, belonging to the Commander SP family. Designed for three-phase induction motor speed control, it is used in CNC machine tools, material handling systems, and industrial automation. The unit integrates V/f and sensorless vector control logic, electronic protections (over-temperature, over-current, under-voltage), and a serial communication interface. Since the alternative code matches the main part number, the component is uniquely identified as SP1401.
The SP1401 drive converts mains voltage into variable voltage and frequency via PWM modulation, enabling precise motor speed control according to the CNC reference. It is the component that makes continuous feed rate or spindle speed regulation possible: without it the motor would operate only at fixed mains frequency, making any controlled machining impossible. A drive failure causes immediate stoppage of the affected axis or spindle, resulting in machine downtime.
Control Techniques is a British manufacturer founded in 1973, a world leader in variable speed drives and servo drives (product ranges: Unidrive, Commander, Mentor, Digitax). Acquired by Emerson Electric in 2004 and subsequently by Nidec Corporation in 2017, it now operates under the Nidec brand. The Commander SP range is legacy / discontinued: available only as used, surplus, or through specialist repair services.
Main Technical Specifications
| Type | AC variable speed drive (inverter / VFD) |
| Part number | SP1401 |
| Brand | Control Techniques (Nidec – Commander SP family, legacy) |
| Known application | CNC machine tools, industrial automation, material handling |
| Function | AC induction motor speed control via PWM modulation |
| Input voltage | ~200–480 V AC, single / three-phase |
| Rated power | ~0.37–2.2 kW |
| Output frequency | 0–400 Hz (typical Commander SP) |
| Control modes | V/f, sensorless open-loop vector |
| Interfaces / communication | Analogue and digital terminal strip; RS485 (typical Commander SP) |
| Weight | ~0.5–1.5 kg |
| Dimensions | ~150–250 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
