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ACT2000
When the mechanical stop is found (actuator velocity less 0.05 inches per
second), the MCE will apply the maximum homing force. Once the maximum
homing force is applied, the firmware program will transition to the HOLDING
MOTOR CURRENT state.
Holding Motor Current State
In the HOLDING MOTOR CURRENT state, the MCE applies a constant
HOLDING FORCE, as long as, the position demand is > 2mA and < 4.1mA.
See Figure 2-7. This feature allows the HOME position to thermally expand or
contract without damaging the ACT2000.
If the actuator firmware program entered the HOME/DEAD BAND state from
POWER-UP/RESET, the firmware program will immediately define the current
actuator position as HOME (zero).
The actuator firmware program will also enter this state from RUN if the
position demand is < 4.1mA and position feedback is < 4.2mA.
Note: If RUN command is removed or position demand ≤ 2 mA, the
actuator will go to the STOP position.
Run State
The RUN state is the ACT2000 normal operating mode. See Figure 2-7. In
the RUN state, the actuator tracks position demand and will apply up to the
maximum force to reach the demand position.
The actuator firmware program enters this state from the HOLDING MOTOR
CURRENT state if the position demand is ≥ 4.1mA. The actuator firmware
program will remain in this state as long as the demand is greater than
4.1mA.
Note: If RUN command is removed or position demand ≤ 2 mA, the
actuator will go to the STOP position.
Stop Position
The STOP position is a user defined, fail-safe position. The STOP position is a
set-up parameter stored in the EEPROM. The STOP position may be anywhere
between HOME (zero position) and maximum span.
The STOP position is not a state per se. However, while in the STOP position the
ACT2000 firmware program will track and hold the position defined in the Set-Up
parameters.
The actuator will move to the STOP position if RUN command is removed during
any of the running modes or position demand is ≤ 2 mA (signal loss).
2.4 Health Monitoring
The firmware program continuously monitors system health while the ACT2000 is
powered.
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