8.3.2 PID Control
AE-Lift is as vector controlled lift motor driver. It calculates required data carrier frequency times and
assigns voltage and frequency of motor signals. Device receives motor speed via encoder of motor. If the
reference speed is differs from the motor speed, device makes calculations to zero this difference. PID
control is the definitions of the adjustment procedure.
PID is a control loop with feedback and use in most of industrial processes. It is a pre-defined procedure
of output refinement process. Figure 8.10 is a typical PID motor speed control system. e(t) is the
difference between motor speed and reference speed named as error signal. e(t) signal processed from
3 different channels in parallel. These are Proportional (P), Integral (I) and Derivative (D) processes. All
channels calculates correction signals with defined parameters and send refinement signal to B point.
Sum of refinement signals creates output signal u(t). Main functions of processes are described in below
table.
F/7.5.5.02.95 R:1
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AE-LIFT
