EXPERT Standard Series User Manual
158
an analog feedback control system.
As shown in Figure 6-36, the pressure given quantity is set with potentiometer and
input through AI1 port in the form of voltage, while the pressure feedback quantity is input
through AI2 port in the form of 0/4~20mA current. Both the given quantity and the feedback
quantity are collected through the analog channel, and the terminal defined as FWD
realizes the start/stop of the closed-loop operation.
The above system can also be used by TG (tachogenerator) for speed closed-loop
control.
PG closed-loop speed control system:
The speed closed-loop control system can be composed of external control terminals
DI4 and DI5, under the coordination of the pulse encoder (PG).
As shown in Figure 6-37, the speed closed-loop given quantity is set with
potentiometer through analog channel AI1 in the form of voltage, while the PG closed-loop
feedback quantity is input with pulse encoder through external terminals DI4 and DI5 in the
form of pulse, and the terminal externally defined as FWD realizes the start/stop of the
closed-loop operation.
In Figure 6-38, A and B are the two-phase quadrature pulse output of PG;
GND and +24 are connected to the working power supply of PG;
The speed given adopts analog voltage 0~10 V signal, and linearly corresponds to
synchronous speed n0 corresponding to 0~maximum frequency (F1.06), fmax is the
maximum frequency (F1.06), and p is the number of poles of motor (F3.00).
P
f
n
max
0
120
For characteristics of input terminals DI4 and DI5, please refer to F6.00~F6.08 speed
measurement input functions 46~48.