VFDs (Variable Frequency Drives) are used for less frequency than fixed speeds controllers. It can be used efficiently to ensure savings in production cost and significantly reduce energy use. It uses an AC motor to control pump and fans in a system without using dampers and valves. A fixed speed motor has to be controlled …
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A Variable Frequency Drive (VFD) is an electronic device that is also known as variable voltage and frequency drive and is also used to control AC induction motor speed. It is due to the inception of VFD that the AC Motors have become prominent again and are now efficiently used in electric motor systems across …
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Variable Speed Drives have become the prominent motor tools when it comes to optimise the speed of HVAC equipment. Variable speed drives are ideal and effective to control the connected load speed, ramping up and down the motor speeds, thereby limiting the energy usage and improving the performance and durability of the equipment. Owing to …
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New series powerful drives VFD family 500 series will come to us soon at the end of this year It is Closed loop Vector Control Frequency Inverter 3-phase 380V/415V(±20%),0.75~630kW VFD500 series high-performance vector control inverter supports multiple international leading control technology such as: improved vectorized VF control(VVF), speed sensor less vector control(SVC), and encoder feedback …
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The variable frequency drive main circuit terminals shown as below Figure. (1) The frequency inverter drive three phase AC input terminals (r/l1, s/l2, t/l3) The power line’s input terminals connect to 3 phase AC power through line protection or leakage protection breaker, it does not need to consider the connection of phase sequence. What needs …
1) Ambient temperature Variable frequency drive just like other electronic devices, has certain requirements about the temperature around it, generally its -10 to +40 °C. As the AC variable frequency drive internal high-power electronic parts are easily influenced by the working temperature, in order to ensure the safety and reliability of the variable speed drive, …
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Generally variable frequency AC drive has following control modes: open loop vector control, V/F control, open loop torque control, closed loop vector control, slip frequency control. Open-loop vector control Apply to high performance general-purpose application with no PG encoder, one AC drive controls an electric motor only. Such as machine tools, centrifuge machines, wire drawing …
7. Torque limit It can be divided into drive torque limitation and brake torque limitation. It is based on the inverter output voltage and current values and calculates torque by CPU, to make the impact load recovery characteristics of the deceleration and constant speed running improved significantly. The torque limitation function can achieve automatic acceleration …
Generally, there are dozens of function parameters in variable speed drive, or even hundreds for option. In practical application, it is not necessary to set every parameter, most parameters can be keep factory default settings. 1. Acceleration/deceleration time Acceleration time is the time required by output frequency from 0 Hz to the maximum frequency, deceleration …
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Lots of parameters need to be set in the variable frequency drive, and each parameter has a setting range, improper setting in individual parameter will result in the variable frequency AC drive can not work smoothly. Therefore, every parameter must have a correct setting to ensure the whole system operation security. 1. Control modes: Such …
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