Hamilton Sundstrand Company ACT2000 - Manual (Page 63)

APPENDIX B: GLOSSARY
Term Definition
RUN Command A discrete 24 VDC signal that enables the ACT2000 extension rod to
move.
RESET Command A discrete 24 VDC signal that causes the ACT2000 internal program
(firmware) to jump to the beginning.
Controller A user-provided computer that executes commands to the ACT2000
and accepts analog and discrete feedback.
Position Demand A 4 mA to 20 mA signal that commands the ACT2000 to move to a
certain position. The signal is scaled with SPAN.
Position Demand Feedback A 4 mA to 20 mA signal that communicates the actual ACT2000
position to the controller.
Motor Current Feedback A 4 mA to 20 mA signal that is proportional to the ACT2000 motor
current. The signal is scaled with Max. Force.
FAULT alarm A discrete signal from the ACT2000 that communicates an internal
failure. The user’s controller will see an open circuit when a FAULT
alarm is active.
OVERTEMP alarm A discrete signal from the ACT2000 that communicates an internal
over temperature; electronics or motor. The user’s controller will see
an open circuit when the OVERTEMP alarm is active.
HOME A mechanical rigid stop from which the ACT2000 calculates position.
HOME is found at start-up during the Homing sequence. The
ACT2000 defines HOME when the motor current exceeds the
HOMING FORCE and velocity is zero. HOME is defined as the
position when the Demand signal is 4 mA.
Homing sequence When the ACT2000 extends or retracts to find a rigid mechanical
stop.
SPAN Maximum distance from HOME. SPAN is defined as the position
when the Demand signal is 20 mA.
STOP position A user-defined position between HOME and SPAN that the ACT2000
travels to upon loss of RUN or position Demand signal.
Maximum Velocity A user defined maximum velocity in inches per second.
Maximum Homing Force A user defined maximum homing force output setting. The motor
control electronics uses this setting to determine the maximum motor
current in the Homing sequence.
Maximum Holding Force A user-defined maximum force while in the Holding Motor Current
state.
APPENDIX C: GLOSSARY 57