Introduction
WEG CFW900 AC Variable Speed Drive (VSD / VFD) for 3 kW constant torque (CT) or 4 kW variable torque (VT) 400 V three-phase motors. Converts a fixed 380-480 Vac three-phase supply into a variable frequency output to control the speed of a standard AC induction motor or permanent magnet synchronous motor.
The WEG CFW900 is a high-performance industrial inverter drive for demanding applications requiring precise speed and torque control such as marine hoists, metal forming and extrusion machinery. The CFW900 supports V/f, Sensorless Vector, and Full Closed-loop Flux Vector control (with optional encoder card fitted), with advanced networking, integrated safety functions, built-in PLC functionality, and extensive expansion capability.
Rating Overview
| Duty Rating |
Motor Power |
Continuous Output Current |
Overload Rating |
Control Type |
| Heavy Duty (CT) |
3 kW |
8 A |
150% for 60 s every 5 mins
200% for 3 s every 5 mins |
V/f, Sensorless Vector, Closed-loop Vector |
| Variable Torque (VT / WEG ND) |
4 kW |
9.6 A |
110% for 60 s every 5 mins
150% for 3 s every 5 mins |
V/f, Sensorless Vector, Closed-loop Vector |
Hardware Overview
- Internal dynamic braking transistor fitted as standard
- Recommended external braking resistor: 53 Ohm
- Maximum braking current: 15 A
- Integrated DC link choke fitted
- Integrated EMC filter fitted, C3 industrial category
- Dedicated STO and SS1-t functional safety inputs
Installation Information
- IP20, suitable for cubicle or flange mounting
- Rated for 50°C operation without derating
- 60°C maximum ambient temperature with derating
- Minimum ventilation clearance: 25 mm top, 25 mm bottom, 0 mm side-by-side, 10 mm front
- Weight: 4.5kg
- Heat loss at full load: 122W (CT) / 145W (VT).
- Heat loss in Standby: 42W
Dimensions
| Frame Size |
Overall Height |
Overall Width |
Overall Depth |
Flange Mount Depth |
Height with Earth Clamp |
Clearance Above/Below |
| A |
245 mm |
145 mm |
222 mm |
158 mm |
334 mm |
25 mm / 25 mm |
Fixing Details
| Mounting Method |
Fixing Centres (h x w) |
Fixings |
| Cubicle or flange mount |
250 mm x 115 mm |
4 x M5 |
Keypad
- Removable graphical multi-line LCD keypad included as standard
- Bluetooth interface built into keypad for smartphone diagnostics and programming
- Optional cubicle door mounting kit available
- Real-time clock supported via CR2032 battery
- SD card slot for parameter backup and SoftPLC storage
Control Functionality
- SoftPLC functionality included as standard
- PC programming via USB port using free WPS software
- External 24V DC control supply supported
- Encoder feedback supported with optional encoder module
- Speed Control Range: 0 Hz to 500 Hz
Inputs and Outputs
| Analogue Inputs |
Digital Inputs |
Analogue Outputs |
Digital Outputs |
Relay Outputs |
Communications |
| 2 |
6 |
2 |
2 |
3 |
Dual Ethernet + Modbus RTU |
Communications and Expansion
- Dual Ethernet ports and Modbus RTU included as standard
- USB programming port fitted as standard
- 4 expansion slots fitted as standard, expandable to 7 slots
Power Supply
Suitable for three-phase 380-480Vac supply only.
Input Power
| Input Current |
Input Voltage |
Voltage Tolerance |
Nominal Frequency |
Frequency Range |
EMC Category |
| 8A (CT) / 9.6A (VT) |
380 Vac to 480 Vac |
-15% / +10% |
50/60 Hz |
48 to 63 Hz |
C3 Industrial |
Part Numbers
| Manufacturer Part Number |
CFW900A09P6T4DB20Y2B |
| WEG Product Code |
14326311 |
| Previous Generation |
CFW11 0010T4 |
The WEG CFW900 replaces the previous-generation CFW11 series while adding integrated Ethernet networking, advanced safety functionality, enhanced motor control performance, and expanded I/O capability.
CFW900 Products, 400Vac, Frame Size A to E
This table gives details of the CFW900 range. This listing is shown in bold. kW ratings are at 400Vac
CFW900 Product Range
| kW Rating (CT) |
1.5 kW |
3 kW |
4 kW |
5.5 kW |
7.5 kW |
11 kW |
15 kW |
18.5 kW |
22 kW |
30 kW |
37 kW |
45 kW |
55 kW |
75 kW |
90 kW |
90 kW |
| Output Current (CT) |
3.9 A |
8 A |
12 A |
17 A |
21 A |
28 A |
33 A |
40 A |
50 A |
62 A |
75 A |
103 A |
124 A |
146 A |
161 A |
190 A |
| kW TRating (VT) |
2.2 kW |
4 kW |
5.5 kW |
7.5 kW |
11 kW |
15 kW |
18.5 kW |
22 kW |
30 kW |
37 kW |
45 kW |
55 kW |
75 kW |
90 kW |
110 kW |
132 kW |
| Output Current (VT) |
4.8 A |
9.6 A |
14 A |
15 A |
26 A |
33 A |
39 A |
50 A |
62 A |
74 A |
96 A |
124 A |
146 A |
172 A |
203 A |
242 A |
| Frame Size |
A |
A |
A |
A |
B |
B |
B |
C |
C |
C |
D |
D |
D |
E |
E |
E |
| Part Number |
14326308 |
14326311 |
14326212 |
14326313 |
14960037 |
14960110 |
14960113 |
15414333 |
15414335 |
15414337 |
15686536 |
15686537 |
15686709 |
15697032 |
15006082 |
15006109 |
Useful Links