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The Control Techniques UNI3405 is a 400V drive with a nominal rating of 37kW at 380 volts, and 50 horsepower at 460 volts. Its output current is 70 amps and its typical input current is 68 amps. It is a size 3 member of the Classic Unidrive family. The UNI3405 can come in a standard industrial model (STD), the LFT for lift applications, the VTC for quadratic load (variable torque) applications such as fans or pumps. It can also be used in REGEN mode if internal modifications are made before it is used in a regen system.
The Unidrive VTC can only operate in open loop quadratic V/f mode. However, every other variant of the Emerson Industrial UNI3405 is designed to operate in 4 primary modes: Open-Loop, Closed-Loop Vector, Servo, and Regen.
Open Loop Mode (OL) is designed to be used with standard induction AC motors. The drive applies various frequencies of power to the motor as programmed by the user. The resulting motor speed is caused by the output frequency of the drive and slip caused by the mechanical load. Slip compensation applied by the drive can improve the overall performance of the motor. The UNI3405’s performance at low speed depends on whether the V/f Mode or Open-Loop Vector Mode is chosen by the user. In V/f Mode, the voltage given to the motor is directly related to the frequence, except for low speeds where a voltage boost must be provided by the user. This mode allows the drive to be used for a variety of multi-motor applications, and typically at 4Hz torque is 100%. In Open-Loop Vector Mode, the voltage applied at low speed differs. The Unidrive uses motor parameters to apply the right voltage levels to keep the flux constant under various load conditions.
Closed-Loop Vector Mode (VT) is designed to be used with induction motors with a speed feedback module fitted. Using the feedback device, the drive directly controls the motor speed to ensure that the rotor speed is kept exactly as needed. Motor flux is controlled extremely accurately using this method, and is able to provide full torque even at zero speed. Usually at 0 RPM torqe is 175%.
Servo Mode (SV) should be used with permanent magnet brushless motors. This mode also requires that you have a speed and position feedback module in place. The UNI3405 controls the motor speed using the feedback devices. Flux control is not needed because the motor is self-excited by the permanent magnets on the rotor. The feedback device supplies absolute position information to the Unidrive to ensure that the output voltage is accurately matched to the back EMF of the motor. Typically there is 175% torque at 0 RPM.
Regen operation allows for bidirectional power flow to and from the AC supply, and it to be used as a regenerative front end for a four quadrant operation. This provides tremendous amounts of efficiency levels in applications that would normally dissipate large sums of energy in the form of heat. The UNI3405 Unidrive is a 400V drive with a nominal rating of 37kW at 380 volts, and 50 horsepower at 460 volts. Its output current is 70 amps and its typical input current is 68 amps. It is a size 3 member of the Classic Unidrive family. The UNI3405 can come in a standard industrial model (STD), the LFT for lift applications, the VTC for quadratic load (variable torque) applications such as fans or pumps. It can also be used in REGEN mode if internal modifications are made before it is used in a regen system.
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