To avoid fault during operation it is always better to perform preventive maintenance of variable. The most common constant torque load applications using vfds are positive displacement pumps, gear pumps, reciprocating pumps, conveyors, extruders, extruder knifecutters, mixers, and. Without a vfd, an hvac fan or pump motor is either 100% on or 100% off. Replace any broken, deformed, or badly worn parts or assemblies according to individual product renewal parts lists. This manual is intended to help users of variable speed drives successfully install. An ac motor is commonly used as a constantspeed drive when fed from a voltage source of fixed frequency. Trust york with your variable frequency drive repair today. By integrating some simple, logical steps into your preventative maintenance program, you can ensure your drives provide many years of troublefree service. By integrating some simple, logical steps into your preventative maintenance pm program, you can ensure that your drives provide many years of troublefree service. This paper defines the key terms used in reliability comparisons and compares two reliability assessment methods commonly in use by vfd manufacturers. The vfdtrainer freq drive training software is a tutorial of the ac frequency drive and related motor control troubleshooting. Each part of a variable frequency drive has the following function.
Therefore, routine maintenance and periodic inspection is essential. By integrating some simple, logical steps into your preventive maintenance pm program, you can ensure your drives provide years of troublefree service. Variable frequency drive vfd installation instructions input ac power 1. It provides a comprehensive, highquality, and costeffective solution to rapidly build student knowledge in vfds and their motor applications.
Compared with a variable frequency drive vfd, the service life of the vorecon is more than three times as long. Variable frequency drive melbourne variable frequency. The speed of the rotating magnetic field can be determined as. Introduction in the united states 50% of the total electrical energy generated is consumed by rotating equipment. It is important to have knowledge about the working of vfds or variable frequency drives vfds, as they are extensively used in the ac motordriven applications, like variable frequency drive for motor control, owing to their wide variety characteristics. Its easier than you might think, but its something you shouldnt take for granted. Pdf predictive reliability models for variable frequency drives. Ac motor, main drive controller assembly, and driveoperator interface 210211 ac motor. Energy is supplied to the drive system from the power supply. Mv7000 variable frequency drives maintenance course description. The variable frequency drive converts this line power into a pulsed output voltage that duplicates varying alternating current to a desired frequency speed. If you enjoyed the video dont forget to like and subscribe, and if you have questions then please.
The term inverter and variablefrequency drive are related and somewhat interchangeable. Which parameters are important and which ones not so much. The width of the pulses is varied so that the average voltage seen by the motor is a sine wave of a given frequency. Variable frequency drive vfd installation instructions. Brief explaination about working of vfds, benefits and. The variable frequency drive vfd should be microprocessorbased inverter logic isolated from power circuits, with a buffered pulse width modulated bpwm output. The basic configuration of a variable frequency drive is as follows. Power is the variable frequency drive of speed and torque and is a measure of the rate. Get the best deal for variable frequency drives from the largest online selection at.
Variable frequency drive reliability application edge volume 1, issue 6 comparing reliability of medium voltage variable frequency drives vfds can be confusing. The figure below shows how the variablefrequency drive. Smartvfd hvac2 standalone variable frequency drives vfd are designed to control hvac motors and pumps up to 25hp to maximize energy efficiency. Any variable frequency drive or vfd incorporates following three stages for controlling a three phase induction motor rectifier stage.
Variable frequency drive types there are three different vfd design types presently on the market. So i need to couple two ac motor to make the vfd loaded. Knowing which ones to adjust and to what setting can be intimidating. In frequency control, the variable frequency drive inverter supplies a series of dc voltage pulses to the motor terminals at a high frequency typically to 0 hz. Some types of singlephase motors or synchronous motors can be advantageous in some situations, but.
Variable frequency drives adjust your motor speed to closely match your output requirements, typically resulting in energy savings of 10 to 50%. Variable frequency drives vfd s popular speed control devices used in industrial, commercial and residential applications. Variable frequency drives are used to adapt the speed of motors to meet the changing. Adaptivebasic autotuning autotuning to perform sensorless vector control can. Mechanical, electrical, and fluid power adjustable speed drives are available that offer some of the aforementioned benefits. See the basic principle with the singlephase ac as the simplest example. The maintenance course includes practical exercises on either a full training drive system or suitcase training drive system or mobile training center, depending on location and availability. The system may include transformers for high voltage system. A variablefrequency drive is a device used in a drive system consisting of the following three main subsystems.
A vfd is an electric device that powers an motor by regulating the frequency and voltage that is supplied to the electronic motor. Mechanical vibrations, heat cycles, and standard maintenance. Based on demand, a vfd adjusts the speed of an hvac fan or pump motor, saving energy and prolonging equipment life. Do you know how to maintain variable frequency drives vfds. I have workshop to maintenance and repair the variable frequency drive, after repairing the vfd must be tested and loaded to full load to ensure that the repair done 100%. Regular preventive maintenance actions allow to control maintenance costs and to optimize life time performance. Generally, variable frequency drives vfds allow to operate motors and pumps at. By integrating a preventive maintenance vfd program, you can ensure your drives provide minimal repair service while maximizing production. Refer to the technical manual for the individual machine for. Test the vfd without a motor to possibly isolate a problem vhz. If the vfd system has bypass, there will be an overload device for the bypass circuit, but if tripped, will also prevent the vfd connect to the motor.
Our systems integration division can build custom drive panels as well. This video will show you how to properly perform maintenance on your variable frequency drive. Courses may also be delivered on board, using the customers drive equipment as available. The speed of a motor defines its rate of converting energy, whilst the torque is a measure of the turning force on an object such as a flywheel. Tighten all nuts and bolts, all terminal blocks, cablewire connections. A variable frequency drive will control the speed of doubling machine according to the load variation and thus reduces power consumption. Freq drive training variable speed drives explained. The most common centrifugal load applications that use vfds are pumps, fans, and compressors. The ac electric motor used in a vfd system is usually a threephase induction motor. A variable frequency drive controls the speed of an ac motor by varying the frequency supplied to the motor. A variable frequency drive is an electric controller that runs an electric motor by changing the voltage and frequency provided to the electric machine. Pdf application of variable frequency drive on the condensate. In theory, these vfds differ primarily in the type of rectification by which they convert ac power to dc power.
For variable frequency drive in continuous operation, we take an external visual inspection for the vfd running state. With more than 50 years of experience in variable speed drive business, driveswarehouse stocks a large selection of ac drives, dc drives, variable frequency drives vfd, variable speed drives, adjustable speed drives, adjustable frequency drives, combo ac motor and drive combination and dc motor and drive combination in a wide range of. A vfd variable frequency drive is also referred to as a variable speed drive, electronic motor controller, adjustable speed drive, or an inverter. Pdf condensate pumps provide the motive force to deliver condensate from the hotwell to the deaerator storage tanks. Preventive maintenance maintenance for drives abb drive. Decreased maintenance costs increased equipment life no need for throttlesdampers builtin soft starting source. Preventive maintenance is all great for the variable frequency drive, cleaning with dry air, checking connections and tightening with correct torque wenchdriver, replacing fan and having spare. An inverter, in general, is a device that converts dc power to ac power. Preventive maintenance checklist of industrial control and drive system equipment figure 5 bus capacitor reforming guidelines operating mechanisms check for proper functioning and freedom from sticking or binding. If we use it improperly and cant do necessary maintenance work, it will cause running faults and make the vfd drive failure, and even cause the variable frequency drive premature damaged, which will affect the normal production. Make sure if you have a bypass function that both the vfd and bypass mode operate the motor in the same direction.
Make sure you are gleaning all the benefits that you canand will continue to do so for years to come. Huge energy savings potential operating centrifugal fans, pumps and compressors vary frequency of electrical supply to an induction motor to vary the motor speed. Vfd drives were first introduced in 1983, and the insulated gate bipolar transistor has in the past 20 years become the standard for vfd drives as an inverter switching device. A converter is a device to create the dc from the ac power supply. Vfd repair variable frequency drive services york repair. Power is the variable frequency drive of speed and torque and is a measure of the rate at which energy is used. The variablefrequency drive training system is a stateoftheart training system specifically designed to introduce students to the basic principles of variablefrequency drives vfds. A freq drive tutorial on variable frequency drive operation, installation, programming and troubleshooting. When the mercury dipped below 32 degrees fahrenheit, the software logic would not allow the drive to start. A variablefrequency drive vfd is a device that controls the voltage and frequency that is being supplied to a motor and therefore controls the speed of the motor and the system it is efficiency is improved. Variable frequency drive vfd troubleshooting and maintenance. Ac drives and dc drives are considered the high tech part of the market and have much of the ac control emphasis.
How to maintain your variable frequency drives youtube. Home faq variable frequency drive repair and maintenance. Regular inspect variable frequency drive to see if there is running anomalies or not, we have following methods. Adjustable frequency drive afd variable speed drive vsd. Pdf a variable frequency drive vfd is a system that can control speed, torque and position of ac motors. A typical variable frequency drive vfd can have anywhere from a few hundred to well over a thousand parameters. Variable speed control can be accomplished, for example, using a frequency converter as the energy control component, a two speed motor as the motor component and gears as the transmission component.
Huge energy savings potential operating centrifugal fans, pumps and compressors vary frequency of electrical. Service bulletin, preventive maintenance checklist of. Preventative maintenance is also done by changing out any worn or discolored parts historically known to faultout, to give your drive even longer performance and more uptime. Basic variable frequency drive maintenance tips as we have seen, increasing pressure to improve financial performance is driving a change in the way end users approach control of production, engineering, operations, and maintenance across the manufacturing enterprise.
Hitachis sj300 series variable frequency drive delivers full feature performance across a wider range of demanding applications requiring high starting torque and functional versatility. Compared to conventional motor drives, vfd has greater functionality and operation. Circuit breakers feeding the vfds are recommended to be thermalmagnetic and fast acting. Compound braking can prove very effective, combining the. The beauty of variable frequency drive vfd is that the maintenance is negligible if are well maintained. Changing any one of the variables will affect the other variables. Ac drives dc drives variable frequency speed drives vfd. Variable speed drive, adjustable frequency drive, microdrive, adjustable speed drive, ac drive, and inverter. An electronic drive for an ac motor controls the motors speed by varying the frequency of the power sent to the motor.
In each of the three drive system components, variable speed control is possible. The drive also regulates the output voltage in proportion to the output frequency to provide a relatively constant ratio of voltage to frequency vhz, as required by the characteristics of. The variable frequency drive evaluation protocol presented here addresses evaluation issues for variablefrequency drives vfds installed on commercial and industrial motordriven centrifugal fans and pumps for which torque varies with speed. Some vfd manufacturers included a type of condensation protection on earlier product versions.
York electronics specializes in the repair of variable frequency drives for over 15 years. Smartvfd hvac2 is a small footprint drive that can fit in your existing enclosure or become a nema 1 enclosure. It is designed for portability and powered using a standard. Installed drives are maintained according to detailed product specific schedules. Nowadays, ac motors are the most important workhorses in industry and commercial facilities. Second of two parts do you know how to maintain variable frequency drives vfds. Variable frequency drives basic operating principles and core maintenance considerations by. Fuji electric variable frequency drive,30 hp,200230v, frn030g1s2u. Basic variable frequency drive maintenance tips vfd. A variable frequency drive vfd is like a throttle on a car. Vfd variable frequency drive maintenance smith and. Variable frequency drives basic operating principles and. The popularity of vfds variable frequency drives and their continual evolution over the past couple of decades has brought features and benefits related to control and resultant energy efficiency.
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