The Delta Electronics VFD-S, formerly branded as Watt Drive L2500, inverter is a high performance compact drive for standard three phase AC motors.
The VFD-S inverter has been discontinued, the VFD-E is the direct replacement.
Specification and prices below:
| Model Number | Watt Drive Model No. | Motor Power | Rated Current | Unit Price |
| 230V 1ph input with built-in RFI filter | ||||
| VFD002S21A | UDGL2500-0002SAW1 | 0.2kW | 1.6A |
not available see VFD-E series |
| VFD004S21A | UDGL2500-0004SBW1 |
0.4kW | 2.5A | |
| VFD007S21A | UDGL2500-0007SBW1 |
0.75kW | 4.2A | |
| VFD015S21A | UDGL2500-0015SEW1 |
1.5kW | 7.5A | |
| VFD022S21A | UDGL2500-0022SEW1 |
2.2kW | 11A | |
| 400V 3ph input | ||||
| VFD004S43A | UDGL2500-0004TCW1 |
0.4kW | 1.5A | not available see VFD-E series |
| VFD007S43A | UDGL2500-0007TDW1 |
0.75kW | 2.5A | |
| VFD015S43A | UDGL2500-0015TFW1 |
1.5kW | 4.2A | |
| VFD022S43A | UDGL2500-0022TFW1 |
2.2kW | 5.5A | |
| Inverter Dimensions | ||||
| Model Number | H (mm) | W (mm) | D (mm) | Weight |
| Single Phase 230V | ||||
| VFD002S21A | 148 | 85 | 127 | 1.3kg |
| VFD004S21A | 148 | 85 | 127 | 1.5kg |
| VFD007S21A | 148 | 85 | 127 | 1.5kg |
| VFD015S21A | 186 | 100 | 129.3 | 2.2kg |
| VFD022S21A | 186 | 100 | 129.3 | 2.5kg |
| Three Phase 400V | ||||
| VFD004S43A | 148 | 85 | 124 | 1.5kg |
| VFD007S43A | 148 | 85 | 126 | 1.5kg |
| VFD015S43A | 186 | 100 | 129 | 2kg |
| VFD022S43A | 186 | 100 | 129 | 2.2kg |