Variable frequency drive Ramping
VFDs offer many of the same advantages as reduced-voltage & soft start starters. The timed speed ramp-up feature found in variable frequency drives is similar to the soft start function of starters. However, the variable frequency drive timed speed ramp-up generally has a much smoother acceleration than soft starting, which is usually done in steps. Soft starting with a variable frequency drive reduces the frequency initially supplied to the motor & steps up the frequency over a preset period of time. Variable frequency drives with soft start capabilities have replaced many of the older types of reduced-voltage starters. While variable frequency drives offer soft start capabilities, true soft start starters are not considered VFDs.
Ramping is the ability of a variable frequency drive to increase or decrease the voltage & frequency to an AC motor gradually. This accelerates & decelerates the motor smoothly, with less stress on both the motor & connected load. Ramp-up is generally a smoother acceleration than the stepped increases used in soft starters. The length of time pre set for the speed ramp-up can be varied from a few seconds to 120 seconds or more, depending on the VFD capabilities.
Timed ramp-down is a function of variable frequency drives that provides smooth deceleration, bringing the motor to a full stop in a preset time. Acceleration & deceleration are separately programmable. Depending on VFD parameters, ramp down times can vary from fractions of a second (when used with dynamic braking) to more than 120 seconds.
The ramp-down function is applied in processes that require smooth stops, but also require the process to stop within a given period of time.
Ramping is the ability of a variable frequency drive to increase or decrease the voltage & frequency to an AC motor gradually. This accelerates & decelerates the motor smoothly, with less stress on both the motor & connected load. Ramp-up is generally a smoother acceleration than the stepped increases used in soft starters. The length of time pre set for the speed ramp-up can be varied from a few seconds to 120 seconds or more, depending on the VFD capabilities.
Timed ramp-down is a function of variable frequency drives that provides smooth deceleration, bringing the motor to a full stop in a preset time. Acceleration & deceleration are separately programmable. Depending on VFD parameters, ramp down times can vary from fractions of a second (when used with dynamic braking) to more than 120 seconds.
The ramp-down function is applied in processes that require smooth stops, but also require the process to stop within a given period of time.
What is the ramp-pair selection parameters in the VFD drive..pls described me
Post a Comment:
You may also like:
Featured Articles
What is VFD, How it works? - VFD ...
VFD is shorted for Variable Frequency Drive (also known as AC Drives and Inverters) -- that's used to make an AC motor working in ...
![What is VFD, How it works? - VFD working principle](/image/VFD-Diagram.jpg)
VFD: Insulated Gate Bipolar Transistor ...
IGBT (insulated gate bipolar transistor) provides a high switching speed necessary for PWM VFD operation. IGBTs are capable of ...
![VFD: Insulated Gate Bipolar Transistor (IGBT)](/image/VFD-IGBT.jpg)
Three phase inverters
In the variable frequency drive rectifier paper, it explains how to go from three phase alternating current voltage to a direct ...
![Three phase inverters](/image/three-phase-inverter-circuit.jpg)
Variable Frequency Drive Harmonics and ...
A discussion of the benefits of variable frequency drives often leads to a question regarding electrical harmonic distortion ...
Variable frequency drive Energy saving
Energy can be saved in a VFD by reducing the losses in the electric motor or by reducing the energy consumption of the variable ...
![Variable frequency drive Energy saving](/image/quadratic-characteristic.jpg)
![Variable Frequency Drive Service](/image/service.jpg)
VFD manufacturers
![Variable Frequency Drive Sales Email](/image/email.jpg)
![Variable Frequency Drive Support Email](/image/email.jpg)