51-V/HZ Profile - Sets the output V/Hz ratio for all values of output voltage verses output frequency up to the Control Base Frequency point. This adjustment will define how much voltage is applied to the motor in various segments of the output frequency range. Please note that motor voltage is related to motor current which can then be related to motor torque. By adjusting the V/Hz profile you can effectively adjust how much torque is available from the motor at various speed points. The available selections include LINEAR (0 or 1) to be used for constant torque applications such as conveyors, and 50% Square Law (2 or 3), or 100% Square Law (4 or 5) to be used for variable torque applications such as centrifugal pumps and blowers. Even number parameter values will select Auto-Boost with the maximum amount of Torque Boost set by Parameter
52-Torque Boost. Odd number parameter values will select a fixed amount of Torque Boost set by Parameter 52-Torque Boost. The choices are shown graphically in Figure 3-1.
| | Figure 3-1 | Volts/Hertz Profiles |
| 100% V | | 100% V | |
| Linear | 51-V/Hz Profile = 0 | 51-V/Hz Profile = 1 |
| Boost | | Boost | |
| 0% | F Base | 0% | F Base |
| | |
| 100% V | | 100% V | |
| 50% Square | 51-V/Hz Profile = 2 | 51-V/Hz Profile = 3 |
| Law |
| | | |
| Boost | | Boost | |
| 0% | F Base | 0% | F Base |
| | |
| 100% V | | 100% V | |
| 100% Square | 51-V/Hz Profile = 4 | 51-V/Hz Profile = 5 |
| Law |
| | | |
| Boost | | Boost | |
| 0% | | 0% | |
F Base | F Base |
Auto Boost | Fixed Boost |
