Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Reexamination Certificate
1998-05-01
2001-09-25
Ip, Paul (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
C318S016000, C318S600000, C706S916000
Reexamination Certificate
active
06294889
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a process and a control device for a motor output suitable for being controlled through a communication bus and capable of informing a supply side network controller through this bus.
2. Discussion of the Background
The architecture of a low level communication bus (factory bus) usually includes a network controller that is called the “master”, and sensors and/or actuators that are called “slaves”. This “master” module and these “slave” modules are connected together through a communication support (pair of conducting wires, coaxial cable, optical fiber, carrier current, etc.) which carry information and possibly the power supply for slaves.
The “slave” module may be a motor output, of which there are several types (direct starter, starter with reversed direction of motion, star-delta starter, progressive starter). This type of motor output consists in an electrical switchgear that partially or completely carries out control functions (contactor, static control) and motor protection functions (circuit breaking, magnetic protection, temperature protection, phase unbalance). One or two “on-off” sensors may be connected directly to this motor output if the application needs them. Electronics locally manage all module components and communication on the bus.
The “master” module sends motor output orders (forward motion command, reverse motion command, stop command) through the communication bus. The motor output executes these commands and returns relevant information (moving, stopped, in fault, etc.), together with the state of its remote “on-off” sensors, through this bus. Patent FR 2 732 523 describes a motor output connected to an AS-I (abbreviation for Actuator Sensor Interface) type communication bus.
We will now consider the example of an automation system composed of a conveyer belt, the motor of which is controlled by an actuator connected to the communication bus. In motion, the master is informed through the bus when a part is detected by a remote “on-off” sensor. It must then return a stop order to this actuator in order to stop the belt. The time interval between when the sensor is activated and the time at which the motor output executes the stop order depends on the various points through which the information passes and the master software cycle and processing times. It also, to a lesser degree, depends on the time to distribute the sensor information on the bus and for the master to distribute the stop command. Therefore the system reaction time is highly variable.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide a motor output capable of locally managing information from the remote sensor and immediately stopping the motor and informing the master, through the communication bus. This motor output can immediately stop the motor controlled by it, after a local sensor reacts following the event.
The control process according to the invention is applicable to a motor output comprising electrical switchgear for control and protection of a motor plus electronics receiving contact information related to the electrical switchgear and controlling at least one control device at the output to control starting or stopping the motor (M) and also receiving information from a remote sensor and communicating with a “Master” network controller through a communication bus, and it is characterized in that it consists in locally controlling the device that stops the motor as soon as the remote sensor is activated while the motor output is in the operating phase and sending information corresponding to this stop on the bus to the master module.
According to another characteristic, the process consists in the master module sending confirmation of the stop through the bus to the electronics that enables it to be unlocked.
According to another characteristic, the process consists in controlling operation of the motor when the electronics receives a start order from the master module, and then deactivating the sensor.
The control device according to the invention comprises electrical motor control and protection switchgear plus electronics receiving contact information related to the electrical switchgear and having an output controlling at least one control device that controls starting or stopping the motor and also receiving information from a remote sensor and communicating with a “master” network controller through a communication bus, and it is characterized in that the electronics comprises means of locally controlling the motor stop control device as soon as the remote sensor is activated during an operating phase of the motor output and means of sending information corresponding to this step on the bus to the master module.
REFERENCES:
patent: 4939437 (1990-07-01), Farag et al.
patent: 5206572 (1993-04-01), Farag et al.
patent: 5386183 (1995-01-01), Cronvich et al.
patent: 5493468 (1996-02-01), Hunter et al.
patent: 5506485 (1996-04-01), Mueller et al.
patent: 5721737 (1998-02-01), Radjabi et al.
patent: 0 736 946 A1 (1996-10-01), None
patent: 2 208 553 A (1989-04-01), None
Briant Joseph
Ganier Andre
Gerard Alain
Ip Paul
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Schneider Electric SA
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