Electrical noise is anything that degrades a measurement in the electrical control system. Noise can be of any frequency. Sources of noise may be the power supply, improper grounding, improper shielding (screening) of cables. Noise may be introduced by hand-held radios including mobile phones. Roller balancing errors or out-of-round rollers or rolls will introduce noise. If the machine vibrates, the drive will sense this and perhaps amplify the resonances.
We want to eliminate any noise that may affect the speed or tension in a web-handling line.
We are often our own worst enemy. It turns out the major source of electrical noise in a drive system Is created by the drive system itself as electrons are tortured into providing the high-frequency switching that VSD relies on.
Noise reduction is very important to the successful operation of your drive system. Follow installation recommendations regarding the 0V common and the safety ground (PE). Connect shielded (screened) cables per the drawings. Use recommended motor leads and motor lead terminators if required. Keep signal and power cables separate. Use isolation transformers or line reactors as recommended.