Cheap price variable frequency drives - VFD 2000
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Let& acute;s speculate a little on what the variable frequency drive proponent might have been thinking. He sees a fan running at a fixed speed and a gas burner cycling between high and low fire to maintain temperature. He thinks to himself, & quot;There is some lower fan speed at which I can maintain temperature without cycling between low fire and high fire. Running a fan at lower speed generates significant electricity savings. This is a good application for variable frequency drive.& quot;
If we consider the same example as resented and that the price of a variable frequency drive is determined by its current rating (i.e. power rating), by reducing the motor size we can reduce the investment cost of the application.
My opinion is that the E-Stop for each variable frequency drive is good, inexpensive insurance. The built in stop button on most variable frequency drives is small, and in an emergency it is nice to have that big red switch for the operator to smack. If the motors are remote (out of line of sight) from the panel then you definitely want an E-Stop adjacent to the motor, and I recommend the maintained type with twist to release. If you have any other protective devices (motor temp switches or such) you just put the E-Stop in series with them.
A direct online motor has a breakdown torque typically in the region of 220% of the motor’s rated torque, whereas a variable frequency drive is limited to a value of about 150%. If variable frequency drive application calls for the motor to continue running through random events of high overload conditions, then the variable frequency drive must be oversized accordingly. Follow VFD on Facebook.
Variable frequency drive
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We have more than 10 years practical experience in VFD drives producing in Shenzhen China.
VFD drives, also known as ac drives and VFDs, are widely used in HVAC systems, pumps and conveyors. An ac drive controls the rotational speed of an electric alternating current (AC) motor by adjusting both voltage and frequency of the electrical power supplied to the ac motor.
The efficient way of cutting down the electricity cost on these motors is to adjust the frequency or speed of operation for the ac motor when big power AC motor is being used. It is the general purpose of the variable frequency drives (VFD) being used for. Electric motors that do not adjust their frequency are limited to operate at the maximum frequency all the times, even when not so much power demand. The ability to adjust the frequency when less power is needed, and also can achieve full power running of the motor can improve efficiency, electricity savings, and optimize the motor-driven process. The energy savings from a frequency inverter can be dramatic, with common energy savings of fifty percent or more. Another advantage of using variable frequency drive is their ability to extend the speed range of the ac motor by being able to have adjustable frequency up to 4000 Hz rather than the normal maximum of 50/60 Hz. However, operation of motors at speeds above their rated operating speeds must be checked and approved by the motor manufacturer. Most ac drives are often programmable and allow the operator to select the conditions that are most suitable for their particular application.
