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ACT2000
2-1
2 FUNCTIONAL DESCRIPTION AND OPERATION
This section describes system functions employed in the ACT2000
Electric Actuator.
2.1 System Description
The ACT2000 is a closed loop servo system containing motor control electronics
(MCE) and a brushless DC motor driven ball screw actuator. The actuator closes
its own control loop on an internally generated position feedback. Thus, the
actuator continuously modulates its position and provides precise positioning.
The ACT2000 requires only 120VDC power, 4-20 mA position demand, and
discrete RUN command to achieve basic operational capability. The ACT2000
provides position and motor current feedback via integral 4-20 mA circuits. Once
120VDC power and RUN command are supplied, the actuator will track position
demand.
2.2 Electronic Description
The ACT2000 electric actuator incorporates digital motor control electronics. The
electronic system block diagram is shown in Figure 2-1. Contained within the
motor control electronics (MCE) are digital and driver CA. The digital and driver
component assemblies contain analog to digital converters, digital signal
processor (DSP), application specific integrated circuit (ASIC) and power
supplies.
Digital CA
The digital CA interfaces with a user-provided control system that is typically a
programmable logic controller (PLC). The digital CA accepts analog position and
discrete RUN and RESET commands from the control system. The digital CA
provides analog position and motor current feedback to the control system. In
addition, the digital CA provides discrete FAULT and OVERTEMP alarms to the
control system.
The digital CA receives position feedback from the resolver and current feedback
from the driver CA. The digital CA can provide speed, temperature, voltage and
other relevant information through the serial interface using ActWiz software.
Contact Precision Engine Controls for ActWiz software.
Note: The digital board analog and discrete interfaces are electrically
isolated. The RS232C serial interface is NOT electrically isolated.
Driver CA
The driver CA interfaces with the user’s power supply; typically a 120 VDC
battery. The driver CA controls current to the brushless DC motor and provides
precise voltage and current inputs to the digital CA.