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The Emerson Industrial UNI3401 is a 400V Unidrive which is rated for 15kW at 380V. It is also rated for 25hp at 460V. It has a output current of 34 amps and a typical input current of 27 amps. The weight of the Model Size 3 Unidrive is 49 pounds respectively. Use appropriate safeguards when lifting these models.
When used in Open-Loop mode, the Control Techniques UNI3401 can be used to control more than one motor. The manufacturer recommends that each motor is connected using a protection relay. This is because the Unidrive cannot protect each motor individually. For a star connection, a sinusoidal filter or output inductor should be connected, even when cable lengths are less than the maximum permitted. The default setting of the motor rated voltage parameter is the same as the Emerson UNI3401 rated voltage, which is 400V. Typically a 3-phase motor is connected in star for 400V operation; however, variations on this are common. Correct correction of the windings is essential, otherwise there will be severe under or over fluxing of the motor. This can cause poor output torque, motor saturation, and overheating. A contactor is at times required to be fitted between the motor and drive for safety isolation purposes - the recommended motor contactor is the AC3 type. The output contactor should only be switched out when when the output of the drive is disabled. If this is done with the drive enabled, it can cause OI.AC trips, high levels of RFI emissions, and increased contactor wear and tear.
Overload protection for the brake resistor is built into the Unidrive software. Two values are needed to set up this function: the resistor short-time overload time and the resistor minimum time in between repeated short time overloads. The minimum resistance value and peak power rating for the Emerson UNI3401 is 10Ω and 60kW. The minimum resistance allows 150% of the power rating for the drive to be dissipated by the braking resistor for up to 60 seconds. For load with large inertia or under constant braking, the continuous power dissipated may be as high as the power rating of the drive.
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