SST 5136-DNP-ISA Redundant channel module

Velocity loop bandwidth is the key indicator of system performance. Systems with fast settling time must have high velocity loop bandwidth. Conversely, if the velocity loop bandwidth is low, attempting to achieve fast settling time by increasing the position loop bandwidth, KPP, leads to overshoot and ringing.

Velocity loop bandwidth

The velocity loop bandwidth (fvc) is given by the equation:KVP is the velocity loop proportional gain in amps/(rad/sec) KT is the 0-peak line-line motor torque constant in lb-in/amp JTOT is the total inertia (motor total + load total) in lb-in-sec2 . (Any consistent set of units for KT, JTOT, such as MKS, that yields KT/JTOT in rad/sec2 /amp will work) The motor torque constant is the value of KT peak published in the Pacific Scientific Motion Control Solutions catalog. Note: fvc is the unity gain open-loop crossover frequency of the idealized rigid single mass system. See hardware specifications for maximum fvc value.

Default bandwidth 

The Create New Configuration and Edit Existing Configuration buttons set KVP to achieve a velocity loop bandwidth of 75 Hz. 830 Tools assumes there is matched load on the motor shaft and the motor has no mechanical brake or other secondary devices installed. fvc Velocity Loop Bandwidth (Hz) = 75 Hz (default)

                                                                        

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