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Modular emergency stop relay system
| Details |
Inventors: Brown, Paul C.; Zomchek, Kevin M.; Sambar, Homer S.;
Assignee: Rockwell Automation Technologies, Inc. (Mayfield Heights, OH)
Primary Examiner: Sircus; Brian
Assistant Examiner: Rios; Roberto J.
Attorney, Agent or Firm: Amin & Turocy, LLP, Gerasimow; Alexander M.
A modular emergency stop device including a switch unit and a control unit. The switch unit includes a switch which converts from a normal state to an emergency state when an emergency stop is necessary and a housing for the switch. The control unit includes a controller which controls a power source for a machine and a housing for the controller. The switch unit's housing and the control unit's housing are adapted to be selectively coupled together and uncoupled from each other. The switch is operably coupled to the controller when the housings are coupled together whereby the controller may appropriately control the machine's power source when the switch is converted to the emergency state. To replace the switch, the switch's housing is uncoupled from the controller's housing to remove the switch unit and a new switch unit is coupled to the controller's housing. |
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DETAILED DESCRIPTION The present invention provides an emergency stop device wherein the switch and the controller are contained in separate modular units.
This modular construction allows the switch to be conveniently removed from the controller and then replaced, inspected and/or tested.
More particularly, the present invention provides a modular emergency stop device comprising a switch unit and a control unit.
The switch unit includes a switch which converts from a normal state to an emergency state when an emergency stop is necessary and a housing for the switch.
The control unit includes a controller which controls a power source for a machine and a housing for the controller.
The switch unit's housing and the control unit's housing are adapted to be selectively coupled/uncoupled relative to each other.
When the housings are coupled together, the switch is operably coupled to the controller, whereby the controller may appropriately control the machine's power source when the switch is converted to the emergency state.
Preferably, the housings include a quick-release coupling arrangement therebetween.
The switch may comprise a circuit arrangement necessary to convert the switch to the emergency state if an emergency stop is necessary.
The circuit may include, among other things, contact pins which are usually the component most vulnerable to damage and deterioration in the emergency stop device.
To replace the switch, the switch unit's housing is uncoupled from the control unit's housing to remove the switch unit and a new switch unit is coupled to the controller's housing.
Likewise, to test the switch, the switch unit's housing is uncoupled from the control unit's housing to remove the switch unit, the uncoupled switch unit is tested, and the tested switch unit is recoupled to the controller unit if testing reveals that the switch is still acceptable.
Preferably, the switch unit's housing includes a plurality of housing sections latched together to form a casing for the switch and/or the control unit's housing includes a plurality of housing sections latched together to form a casing for the controller
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