Encoder; Mechanical Design - ABB ACS880 Manual

24 Planning the drive system

Encoder

The maximum pulse frequency of the encoder must be checked. With ACS880 encoder
interface modules, the maximum pulse frequency is typically 500 kHz (see the technical
data section of the appropriate interface manual).
To calculate, first find out
• the maximum motor speed n
• the number of encoder pulses per revolution.
Example: A sine-cosine encoder generates 600 pulses per revolution, and the maximum
motor speed is 20000 rpm. The maximum pulse frequency equals 600 × 20000/60 = 200000
= 200 kHz. This is OK with an FEN-11 interface.

Mechanical design

The filter generates a considerable amount of heat, so no heat-sensitive components should
be installed in the filter cubicle.
in rpm, and
max