Emerson Commander SK Inverter SKD3400550
Original price was: $1,050.00.$950.00Current price is: $950.00.
Emerson Commander SK Inverter – Compact General Purpose AC Drive
General purpose AC drive from Emerson / Control Techniques. Power range: 0.25 kW to 132 kW across 100V–690V classes. The drive features sensorless vector control, dual Normal/Heavy Duty ratings (150% overload for 60s), a built-in EMC filter, braking transistor, and Modbus RTU as standard. Additionally, it includes a PID controller, 8 preset speeds, and energy-saving V/Hz modes for pumps and fans. With IP20 protection, models SKB3400037 (0.37kW), SKB3400110 (1.1kW), SKC3400300 (3.0kW), SKC3400400 (4.0kW), and SKD3400550 (5.5kW) cover 0.37kW to 5.5kW in the 400V class. Ideal for conveyors, pumps, fans, and general machinery.
Emerson Commander SK Inverter – Complete Portfolio
| Feature / Specification | Details |
|---|---|
| Product Family | Commander SK General Purpose AC Drive |
| Manufacturer | Emerson / Control Techniques |
| Power Range | 0.25 kW to 132 kW (0.33 hp to 200 hp) |
| Voltage Classes | 100 V, 200 V, 400 V, 575 V, 690 V |
| Input Phases | Single-phase and three-phase options |
| Control Modes | Sensorless vector control, V/Hz control, torque control |
| Output Frequency | 0 to 1500 Hz |
| Switching Frequency | 3 to 18 kHz (model-dependent) |
| Overload Capacity | Heavy Duty: 150% for 60 seconds |
| Built-in Features | EMC filter, braking transistor, Modbus RTU (RS485), keypad, PID controller, 8 preset speeds |
| Protection Class | IP20 standard |
| Ambient Temperature | -10°C to +40°C |
| Certifications | CE, UL, cUL, EAC |
Typical Applications & Industries:
✓ Conveyors and material handling ✓ Pumps and fans (quadratic V/Hz for energy savings)
✓ General machinery and OEM equipment ✓ Cranes and hoisting (heavy duty)
✓ HVAC and building automation
Detailed Description – Emerson Commander SK Inverter
1. Series Overview – Compact General Purpose Drive
The Commander SK is a general-purpose AC drive from Emerson (Control Techniques) designed for simple and efficient motor control in industrial applications. It offers a power range from 0.25 kW to 132 kW across multiple voltage classes. Therefore, it suits a wide variety of global applications.
This drive features a compact, modular construction for ease of use. Specifically, its design philosophy ensures that just ten parameters can satisfy 90% of typical applications. As a result, users can complete rapid commissioning without extensive programming knowledge.
2. Key Features and Control Modes
Sensorless Vector Control – The drive provides high torque at low speeds (down to 1 Hz) without requiring an encoder. Consequently, it improves performance over simple V/Hz drives.
Dual Rating (Normal / Heavy Duty) – Users can configure the drive for either Normal Duty or Heavy Duty (150% overload for 60 seconds). For example, Normal Duty is ideal for fans and pumps, while Heavy Duty suits constant torque loads like conveyors and cranes.
Built-in Braking Transistor – The SK series includes a standard braking transistor. Thus, it allows for dynamic braking with an external resistor for rapid deceleration.
Energy Saving Functions – The drive features Dynamic V/Hz and Quadratic V/Hz modes. Furthermore, the quadratic mode specifically optimizes pumps and fans, which reduces energy consumption at partial loads.
Advanced Software Functions – The drive includes a PID controller, timers, logic functions, and an energy meter as standard. This means you can reduce the need for external controllers.
3. Communication and Expansion
Standard Modbus RTU – The drive includes an RS485 port via an RJ45 connector for serial communication.
Fieldbus Options – The system supports optional modules for Profibus, DeviceNet, CANopen, and EtherNet. Therefore, it easily integrates into higher-level automation systems.
SmartStick / LogicStick – Optional memory sticks allow for quick parameter backup and transfer. In addition, the LogicStick enables ladder programming for simple logic functions without a separate PLC.
4. Model Number Breakdown (Selected Examples)
The Commander SK naming convention identifies the frame size, voltage, and power rating. Below are the specifications for the specific models you listed, based on available data:
| Model Number | Frame Size | Voltage Class | Power Rating (Normal Duty) | Notes |
|---|---|---|---|---|
| SKB3400037 | B | 400 V (3-Phase) | 0.37 kW | Compact entry-level model |
| SKB3400110 | B | 400 V (3-Phase) | 1.1 kW | |
| SKC3400300 | C | 400 V (3-Phase) | 3.0 kW | |
| SKC3400400 | 3 | 400 V (3-Phase) | 4.0 kW | Size C frame |
| SKD3400550 | D | 400 V (3-Phase) | 5.5 kW | Size D frame, with internal fan |
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