Choosing the best cables for VSDs

VSD-controlled pump installations sometimes experience spurious tripping or erratic process measurements. As ABB’s Martin Richardson reveals, such problems are increasingly being attributed to incorrect choice or installation of cabling. Choosing motor cables for VSD installations is more critical than selecting standard cables because the motor side does not have a sinusoidal voltage waveform and suffers from fast-rising voltages and high frequencies. These can induce electromagnetic disturbance, causing measurement devices or controllers to perform erratically. Incorrect…