This also translates into reduced motor heat loads in refrigerated spaces. VFD speed control provides dramatic fan power reductions at reduced speed.On compressors with no capacity control speed control will eliminate other poor control strategies. VFD speed control will reduce the power penalty associated with slide valve, poppet valve or throttling capacity control.VFDs give better control and more efficiency for compressors, fans and pumps: Two types of motor load exist constant torque and variable torque. With a change in speed the motor load will not only benefit from the speed reduction, but also any reduction in torque with speed. With a fixed speed, motor power is determined by the torque of the load. The shaft load on the motor is determined by the product of shaft speed and torque. This speed is determined by the frequency of the power supply and the motor design (number of poles). In standard system designs, electric motors are intended to operate at a fixed speed. Fuji Electric Variable Frequency Drives (VFD) make it possible to quickly provide the necessary cooling or heating to maintain a uniform temperature, humidity, air-circulation or fresh air requirements in cold storage while at the same time the energy consumption is reduced to a minimum. Significant levels of refrigerants and heating are needed to slow down spoilage and maintain preharvest freshness and flavor of ripe fruit and vegetables. One of the PID sensors will need to be a 0-10v signal and the second will need to be a 4-20ma input. ![]() There is a sensor threshold and time that controls the switching between PID1 or PID2. The second loop, PID2, controls the water table level. Throughout this process, the first loop, PID1, will control the output pipe pressure. For this case, the ECO-DY model achieves the control by switching between two PID loops. This prevents costly dry run damage to the submersible pump.įuji Electric VFDs are designed to handle harsh outdoor conditions needed for Agriculture Irrigation control. This feature will control a pump’s output pressure and automatically switch to water table level control when the level sensor goes below an adjustable threshold. Fuji Electric’s ECO-DY model has a standard feature of a simultaneous control of Pump pressure and water table level control. ![]() The VFDs also maintains a UL rating under single phase power input. Our products are designed to operate in 50 deg C ambient under full load conditions with no derating factor.
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