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US 2007/0176758 A1Published application
Actuator control system
AssigneeHoneywell International Inc.
InventorsMark D. Bokusky, Cory L. Grabinger, Emily R. Vinella
Life of this patent
Estimating the term…
Abstract
A system for maintaining appropriate control of an actuator in the event of a power disruption without being adversely affected by the period of the power disruption. The actuator may close during the power disruption but will be fully opened upon the return of power to the system. After being opened, the actuator may be kept open with less power than needed for opening it.
Claims20
An actuator control system comprising:
- an actuator;
- and
- a control circuit connected to the actuator;
- and
- wherein if a period of time between a removal of power and a return of power to the system is within a range between about one millisecond and greater than five minutes, then the control circuit can open the actuator upon the return of power.
2 more elements
A method for recovery after a power disruption of a system for controlling an actuator, comprising:
- providing a system for controlling an actuator;
- detecting a loss of power from the system;
- resetting a latch into a drive mode for driving an actuator to an open position before energy in the system dissipates below a predetermined level;
- detecting a return of power to the system;
- delaying putting the latch into a hold mode for a predetermined period of time after the return of power to the system;
- and
- driving the actuator to the open position during the predetermined period of time while the latch is in the drive mode.
4 more elements
A system for recovery after power disruption, comprising:
- an actuator having a run mode;
- a driver connected to the actuator;
- a latch connected to the driver;
- a voltage change detect and reset circuit connected to the latch;
- and
- wherein upon a power loss from the system, the voltage change detect and reset circuit resets the latch to put the actuator into the run mode, before residual power in the system is gone.
3 more elements
Dependencies are inferred from the claim text.