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CONTROL TECHNIQUES Inverter
Brand: CONTROL TECHNIQUES -
Code:SP2402
| Combination name | Availability | Price |
|---|---|---|
AC Vector Inverter / Variable Speed Drive – Control Techniques SP2402
The SP2402 is an AC variable speed drive (“AC Inverter / Variable Frequency Drive”) from the Unidrive SP series, manufactured by Control Techniques. It belongs to the Frame 2, 400 V class and is employed on CNC machine tools and industrial automation systems requiring precise speed and torque control of AC induction or permanent-magnet synchronous motors. It supports four operating modes: scalar V/Hz, Open Loop Vector (sensorless), Closed Loop Vector (with encoder), and Servo. An integrated RS485 / Modbus RTU interface and an option slot for fieldbus expansion modules (Profibus-DP, CANopen, DeviceNet, EtherCAT) are included.
The inverter converts the fixed-frequency mains supply into a variable-voltage, variable-frequency three-phase output, enabling precise control of motor speed and torque. In a CNC machining centre, a drive failure causes immediate shutdown of the controlled axis or spindle: the machine stops, the workpiece risks being scrapped, and — should active safety not intervene — a collision may occur.
Control Techniques is a British manufacturer founded in 1968 and specialised in variable-speed drives for AC and DC motors. Acquired by Emerson Electric in 1992 and later by Nidec Corporation in 2017, it now operates as Nidec Industrial Solutions. The Unidrive SP series is legacy / discontinued: the platform has been superseded by the Unidrive M family; SP drives are available exclusively as used, NOS (surplus), or through specialist repair centres.
Main Technical Specifications
| Type | AC inverter / variable speed drive (VFD), Unidrive SP series, Frame 2 |
| Part number | SP2402 |
| Brand | Control Techniques (Nidec Industrial Solutions) |
| Known application | CNC machine tools, machining centres and industrial automation systems with AC induction or PM synchronous motors |
| Function | AC motor speed and torque control in open-loop (sensorless) or closed-loop (encoder / resolver) mode |
| Input voltage | 380–480 V AC 3-phase, 50/60 Hz |
| Rated power | ~4.0–7.5 kW |
| Rated output current | ~9–16 A |
| Control modes | V/Hz scalar, Open Loop Vector, Closed Loop Vector, Servo |
| Feedback | Incremental encoder (AB/Z), resolver or sensorless |
| Communications | RS485 / Modbus RTU built-in; option slot for Profibus-DP, CANopen, DeviceNet, EtherCAT |
| I/O | Programmable digital and analogue inputs/outputs (parameter-configurable) |
| Protections | Overcurrent, overvoltage, undervoltage, overtemperature, earth fault, short circuit |
| Protection class | IP20 standard (IP55 with optional filter kit) |
| Weight | ~2–4 kg |
| Dimensions | ~185–250 × 100–140 × 180–230 mm |
| Production status | Legacy / discontinued — superseded by Unidrive M; available as used, NOS, or via specialist repair |
