EMERSON Unidrive SP Universal AC Drives SPMA1401

EMERSON Unidrive SP Universal AC Drives SPMA1401

The Emerson Unidrive SP Universal AC Drives SPMA1401 is a high-performance variable frequency drive that is designed for precise control of AC motors in industrial applications. It features advanced control algorithms, high motor torque response, and a wide range of communication options for seamless integration into automation systems. The SPMA1401 is a reliable and efficient drive that can help improve the performance and energy efficiency of your motor-driven systems.

Continuous rating if drive is part of a common DC bus system. In parallel systems without the DC bus connected, the resistors must be matched to within ±5%.

For high-inertia loads or under continuous braking, the continuous power dissipated in the braking resistor may be as high as the power rating of the drive. The total energy dissipated in the braking resistor is dependent on the amount of energy to be extracted from the load.

The instantaneous power rating refers to the short-term maximum power dissipated during the on intervals of the pulse width modulated braking control cycle. The braking resistor must be able to withstand this
dissipation for short intervals (milliseconds). Higher resistance values require proportionately lower instantaneous power ratings.

In most applications, braking occurs only occasionally. This allows the continuous power rating of the braking resistor to be much lower than the power rating of the drive. It is essential, though, that the instantaneous power rating and energy rating of the braking resistor are sufficient for the most extreme braking duty that is likely to be encountered.

Optimization of the braking resistor requires a careful consideration of the braking duty. 

Select a value of resistance for the braking resistor that is not less than the specified minimum resistance. Larger resistance values may give a cost saving, as well as a safety benefit in the event of a fault in the
braking system. Braking capability will then be reduced, which could cause the drive to trip during braking if the value chosen is too large.

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