Typical System Structure; Method Of Operation - WEST PAM-195-P-PVG Technical Documentation Manual

4.2

Typical system structure

This minimal system consists of the following components:
(*1) proportional valve
(*2) hydraulic cylinder
(*3) power amplifier PAM-195-P-PVG
(*4) reference supply and ratiometric signal
4.3

Method of operation

This power amplifier is controlled by a ratiometric input signal (normally from a joystick). That means 25% up
to 75% of the separately measured voltage value are used as command signal. 50% are the zero position. An
ENABLE signal (typically 24V) activates the module and the READY output indicates this, if no internal or ex-
ternal error was detected.
The integrated standard functions will be configured via different parameters.
In case of a fault, the power output stage will be deactivated and the fault will be indicated through a deac-
tivated READY output and a flashing READY LED.
The output current is closed loop controlled whereby a high accuracy and a good dynamic will be obtained. All
custom proportional valves (up to 2,6A) may be controlled with this power amplifier.
Page 11 of 27 PAM-195-P-PVG 18.06.2019