Hamilton Sundstrand Company ACT2000 - Manual (Page 28)

22 ACT2000 USER GUIDE
also enables the ACT2000 and actuator to track the DEMAND signal. The
actuator will move to the Stop Position if the RUN command is set to OFF
or lost.
RESET Command
The RESET command is a user-provided discrete input to the ACT2000.
This command causes the ACT2000 to reset all internal position
indicators, reload all set-up parameters, and to then move the actuator
through its initial homing sequence again. (The RUN command must be
set to ON before the homing sequence can begin.) RUN and DEMAND
inputs are ignored during the RESET command. To reset the ACT2000,
+24 VDC must be applied across the RESET wires for at least 0.5
seconds in order to reset the controller and actuator.
DEMAND Signal
The DEMAND signal is a user-provided analog input that is used to
control the position of the actuator. The current level of the DEMAND
signal is correlated to the position of the actuator within its span. The
minimum Demand signal of 4.0 mA is correlated to the Home position.
The maximum Demand signal of 20 mA is correlated to the full span
position.
Feedback Signals
The ACT2000 provides two two-wire feedback signals via the integral
17- wire signal harness. Refer to Figure 1-10 for typical connections.
Refer to the General Specification Summary Table in Section 1.2 for
feedback specification values.
Position Feedback
The ACT2000 provides analog actuator position feedback to the user.
This internally generated feedback signal is proportional to the actuator
position. A signal level of 4 mA represents that the actuator is at its home
position, while a signal level of 20 mA represents that the actuator is at its
maximum span.
Motor Current Feedback
The ACT2000 provides motor current feedback. This internally generated
feedback signal is proportional to actuator load. A signal level of 4 mA
represents no load on the actuator, while a signal level of 20 mA is the
maximum load.