Product Overview
The Emerson SPMC2402 is a Controlled Input Rectifier Module belonging to the Unidrive SPM modular drive platform, developed by Control Techniques — the drives business acquired by Emerson and now operating under Nidec. The “SPMC” prefix identifies a *semi-controlled* rectifier front-end built around a dual half-controlled thyristor bridge, while the digits that follow encode the architecture: the leading “2” denotes the two-stage rectifier arrangement, the “4” defines the 400 V voltage class, and “02” identifies the current frame size. Within the Unidrive SPM architecture, the SPMC2402 occupies the utility-side face of the drive system, converting a 380-480 V AC ±10 % three-phase supply into a regulated DC link that feeds the SPMD inverter modules mounted alongside it on the same bus.
Unlike its uncontrolled sibling, the SPMU2402, the controlled topology of the SPMC2402 allows the DC bus voltage to be actively regulated, enables four-quadrant regenerative operation in multi-drive systems sharing a common DC bus, and permits the module to act as an external charging source for pre-charging downstream capacitor banks. Soft-start sequencing is built into the module itself, eliminating the external charging resistors and contactors that uncontrolled front-ends require, and status feedback is delivered through two front-panel LEDs plus a configurable status relay that must be wired into the drive enable circuit to enforce safe interlocking.
With a continuous AC line current of 677 A, a DC link capability of 758 A, and a maximum bus capacitance of 132 mF under supply short-circuit capacities below 25 kA, the Emerson SPMC2402 is engineered for the highest-power end of the SPM range — multi-drive common DC bus installations, regenerative hoisting and winch systems, and parallel drive configurations in oil and gas, marine, mining, and metals applications where availability, controllability, and modularity are non-negotiable.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | SPMC2402 |
| Manufacturer | Emerson / Control Techniques (Nidec) |
| Product Type | Controlled Input Rectifier Module (dual half-controlled thyristor bridge) |
| Product Family | Unidrive SPM modular drive system |
| Input Voltage | 380-480 V AC ±10 %, three-phase, 48-65 Hz |
| Voltage Class | 400 V class (“4” in model designation) |
| Rectifier Topology | Dual half-controlled thyristor bridge, 2-stage (“2” in model designation) |
| Continuous AC Line Current | 677 A at 100 % normal load |
| DC Link Current | 758 A at 100 % normal load |
| Typical Input Current | 2 × 308 A |
| Maximum Input Current | 2 × 312 A |
| Typical DC Output Current | 2 × 345 A DC |
| DC Output Voltage | Approximately 513-648 V DC (varies with input and control angle) |
| DC Semiconductor Fuse | 450 A, IEC aR class |
| Series HRC Fuse | 400 A, IEC gG / UL J class |
| AC Input Cable | 2 × 120 mm² (2 × 4/0 AWG) |
| DC Output Cable | 2 × 120 mm² (2 × 4/0 AWG) |
| Maximum DC Bus Capacitance | 132 mF (supply short-circuit capacity < 25 kA); 66 mF with INL412 input reactor |
| Control Supply | External 24 V DC / 3 A, 4 A slow-blow fuse per pole |
| Status Relay Contacts | 250 V AC / 6 A non-inductive; 4 A DC at 40 V; 400 mA DC at 250 V |
| Soft Start | Built-in (no external charging contactor required) |
| Status Indication | 2 × front-panel LEDs (Status1 / Status0) |
| Maximum Power Loss | Approximately 1737 W |
| Cooling | Forced-air |
| Dimensions | Approximately 399.1 × 298 × 310 mm |
| Weight | Approximately 20 kg |