When you are using the motor, if you simply change the frequency, your motor will most likely be burned out. This problem is especially acute when the frequency is reduced. In order to prevent the motor from burning out, the inverter must change the voltage at the same time as the frequency.
For example, in order to halve the motor speed, the output frequency of the VFD must be changed from 60Hz to 30Hz, and then the output voltage of the VFD must be changed from 400V to about 200V.
To use the VFD correctly
The loss of power of a VFD increases exponentially with temperature. The service life decreases exponentially with increasing temperature. When the ambient temperature rises by 10 degrees, the service life of the VFD is halved. So keep an eye on heat dissipation!
When operating a VFD, the current flowing through the VFD is very large, and the heat generated by the VFD is also very large, and the effect of heat generation cannot be ignored.
Usually the VFD is installed in the control cabinet. Let's take a look at the calorific value of a VFD. Ability to budget through the following formula:
Approximate calorific capacity = VFD capacity (KW) ×55 [W]. Here, if the VFD capacity is based on the constant torque load (the overcurrent capacity is 150% * 60s), if the VFD has a DC reactor or AC reactor and is also in the cabinet, the heat will be greater. It is best to mount the reactor on the VFD side or above the measurement.
This is where the budget can be used: VFD capacity (KW) ×60 [W]. Because the hardware of each inverter manufacturer is similar, the above formula can be used for a variety of brands. Note: If there is a braking resistor, it is best to install it in the best position and isolate it from the VFD, such as on or next to the cabinet. Because the braking resistor dissipates heat greatly.
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