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(1) Energy saving;
(2) Speed regulation, improve production efficiency, and enhance product quality;
(3) Equipped with soft start function to protect the motor.
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When the frequency decreases, the voltage is reduced proportionally. As the AC impedance decreases while the DC resistance remains unchanged, it will result in a decrease in the ground torque generated at low speeds. Therefore, when V/f is given at low frequencies, torque boosting is usually used to obtain a certain starting torque.
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In practical engineering, the most widely used regulator control laws are proportional, integral, and derivative control, abbreviated as PID control. The parameter tuning of PID controller is the core content of control system design. It determines the proportional coefficient, integration time, and differentiation time of the PID controller based on the characteristics of the controlled process.
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Usually, in open-loop control, even if the VFD outputs a given frequency, the motor's speed varies within the rated slip rate range (1%~5%) when running with a load. For situations where high speed regulation accuracy is required and even load changes require operation close to a given speed, Epsivo frequency converters can be used for closed-loop control.
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If the given acceleration and deceleration time is too short, the output frequency of the VFD will change much more than the change in speed (electrical angular frequency), and the VFD will trip and stop running due to over-current, which is called stall. In order to prevent the motor from continuing to operate due to stall, when the acceleration and deceleration current is too high, the acceleration and deceleration rate should be appropriately slowed down to achieve over-current stall protection.
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For digital controlled frequency converters, even if the frequency command is an analog signal, the output frequency is still given in stages. The smallest unit of this level difference is called the frequency conversion resolution. The frequency conversion resolution is usually taken as 0.01~0.5Hz. For example, if the resolution is 0.5Hz, the frequency above 30Hz can be changed to 30.5 and 31.0Hz, so the motor's action is also followed in stages.
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Sure, the Epsivo VFD supports an input frequency range of 50/60HZ with a fluctuation range of ± 5%.
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Sure, but it cannot achieve the control accuracy of the servo controller.
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If the input terminal over-voltage is mild, an over-voltage protection fault will be reported, and if it is severe, the internal circuit of the VFD will be damaged.
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Lightning strikes are divided into direct lightning strikes and induced lightning strikes. Direct lightning strike refers to lightning directly hitting the struck object, causing the greatest damage; Induction lightning is the electromagnetic wave generated by lightning that induces high voltage on a conductor, causing over-voltage and damage to electrical appliances connected to the conductor. On the power grid, multi-stage lightning arresters have been installed, but the residual voltage of the preceding stage lightning or the lightning induced voltage near the VFD can still cause damage to the frequency converter. Solution: Install an incoming lightning arrester in the VFD control cabinet. The incoming lightning arrester generally adopts a power lightning protection module, slide installation, and parallel grounding.
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When a large motor starts, it will pull down the grid voltage, while other loads with constant output power will cause excessive current and report faults, thus stopping operation. Solution: Increase the capacity of power grid transformers
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The VFD can be installed on the wall or in a cabinet. To achieve optimal heat dissipation, please install it vertically.
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The operating environment temperature is between -10 ℃ and+40C, and between+40 ℃ and+50 ℃. Please reduce the rating for use. The relative humidity of the air is less than 95% and there is no condensation. When the VFD is installed below an altitude of 1000m, it can operate at its rated power. When the altitude exceeds 1000m, it can be used with a 1% derating ratio of 100m. A place far away from electromagnetic radiation sources. A place where no oil mist, corrosive flammable gases, radioactive substances, metal dust, dust, oil, water or other foreign objects will enter the contents of the frequency converter.
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According to the requirement that the operating environment temperature of the VFD should be below 40 ℃, it is recommended to install a heat dissipation device (air conditioner or fan) to achieve good heat dissipation effect.
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When the VFD stops running, the leakage current is generally small. When operating the frequency converter, there are high-order harmonics in the output current due to the high-speed switching of the power module of the inverter. Due to the presence of inductance between cables and ground, there is a significant leakage current (up to 10 times that of when the VFD stops running)
