Minarik model PCM3 signal isolators produce a floating DC voltage
signal proportional to a variable DC current or voltage signal input.
It also can generate the floating DC voltage signal output controlled
by an external potentiometer. The output signal fed to a speed
controller allows a motor to be driven automatically at a speed
proportional to the signal, i.e., to follow the signal. The maximum
PCM3 output voltage is 10 VDC.
The PCM3 DC voltage output must be trimmed to not exceed the
reference voltage, i.e., the normal voltage drop across the speed
adjust potentiometer of the motor speed controller. For Minarik
MM20000 series controls, the reference voltage is approximately
3.5 VDC. Putting higher DC voltage into the control speed adjust
circuit will not produce correspondingly higher motor speeds. Such
an error can seriously degrade the linearity between the process
signal level and motor speed.
This manual contains specifications, installation procedures,
connections, and calibration procedures for the process control
module, model PCM3. Refer to your variable speed drive user’s
manual for additional installation, operation, and troubleshooting
procedures.
3
Introduction
