Benshaw is pleased to offer Solid-State Starter training at our facilities in. Benshaw Product Downloads. Catalogs: Benshaw Product Catalog. Solid State Motor Control. Technology. Publication #:
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The starter control assembly of claim 1 wherein said stationary contact includes an electrically conducting surface of said heat sink.
Benshaw Cfrsd6sb 5 HP Solid State Starter a CFRSD6SB | eBay
The starter control assembly of claim 1 wherein said stationary contact includes a rigid bracket extending generally perpendicular to the surface of the heat sinks and having a renewable wear surface of electrically conducting material attached thereto. One such means is shown in which limit switch 40 has a roller portion which contacts the insulated frame The incoming solenoids such as 18a, 18b can be coordinated with the thyristor gating circuit to first phase off the thyristor, reducing the load current to a minimum or trickle value before opening contacts 16, Nature of Business Manufacturer.
The present invention provides for mounting the semiconductor devices between heat sinks which conduct the heat away from the semiconductor device and provide a current path to and from the semiconductor device. Benshaw manufactures a wide range of medium voltage solid state motor controls to suit your application requirements.
The starter control assembly of claim 12 wherein said stationary line contact includes a rigid bracket extending generally perpendicular to the surface of the heat sinks and having a renewable wear surface of electrically conducting material attached thereto.
In one preferred embodiment of the device shown in FIG. This can be supplied for brush type, and brushless exciters. In such a motor starter each phase would have a separate solenoid operating respective incoming contacts and shunting contacts, so that a total of six solenoids would be used.
With more built-in features, more configurable options, greater expandability, and a broader communications capability, Benshaw’s next generation MX3 technology will shorten commissioning times, improve motor performance and protection, enhance diagnostic capabilities, and streamline electrical system monitoring and maintenance tasks. Heat sink and mounting arrangement therefor. Stationary contact 25 is rigidly mounted to incoming heat sink Is that high enough?
The starter control assembly of claim 17 wherein said solenoid is mounted on at least one of each pair of heat sinks.
Benshaw Marine Duty Starter Packages
The functional bypass circuit is established through stationary contact 38 on the incoming heat sink and stationary contact 39 on the outgoing heat sink. Preferably these heat sinks are made solud aluminum.
Also a single solenoid actuates a single shorting bar 15a which in turn contacts stationary contacts 14a and 14b. Return spring 44 functions to oppose the stxrter of contact frame 28 into the closed position and is used when solenoid 27 is deactivated so as to open the set of contacts 24, 25 and The starter control assembly of claim 1 wherein said at least one stationary contact includes at least one stationary contact mounted on each of said line and strter heat sinks; and said movable contact means engages said stationary contacts on said line and load heat sinks to selectively establish a shunt path between said line and load heat sinks.
Don’t just take my word for it, check out this website. When the motor was desired to operate, electric signals would activate solenoid 8 on the incoming line side of assembly 1, causing movable contactor bar 7 to engage stationary contact 6a etarter 6b, thereby placing incoming heat sink 2a in electrical contact with incoming line lug 10a.
This shunting path between adjacent heat sinks created by stationary contact 4a, bar 5, and stationary contact 4b would then carry the load current between the adjacent heat sinks 2a and 2b. While the gating of semiconductors 3a and 3b provide variable control of the currents between the heat sink 2a and 2b to the load, shunting solenoid 9 controls a movable shunting contact bar 5 which, when activated, engages stationary contacts 4a and 4b, thereby providing a direct shunt or current bypass between heat sinks 2a and 2b.
Except for the gating circuits all elements of the starter are mounted on the heat sink. Such wiring is not only costly but difficult to install as its large diameter requires that any bend or change in direction maintain a minimum bending radius so as not to damage the conductor.
Standard and built to benhaw low voltage products include a range of open chassis continuous duty non-bypassed starters, open chassis starters with integral bypass and prepackaged reduced voltage solid state starters in combination circuit solis configurations with dual redundancy, non-bypassed continuous duty configurations and integral bypass configurations to suit yourapplication requirements.
Renewable contact wear surfaces of other styles can also be used in the invention. Currents flowing in load heat sink 2b are connected to the load via the load connector staet lug 10b.
In such embodiment both solenoids 8 and 9 would be in their normally open unenergized position. Unfortunately one of the characteristics of such semiconductor devices is their generation of heat.
The starter control assembly of claim 16 wherein said stationary contact includes an electrically conducting surface of said heat sink. In this embodiment of the shunting contacts the stationary contacts 38 and 39 are merely contact wear surfaces held by threaded bolts to the heat sink. United States Patent While the stationary contact shown in the figures have been mounted on the upper surface of the heat sink, it is equally feasible in applications, where desirable, to mount the stationary contacts upon the lower surface or other areas of the heat sinks.
The field of motor starters comprises a group of switching elements which may be used to control electrical power to a load. Low-inductance bus bar arrangement. The heat sinks 2a, 2b generally can be of the extruded aluminum type commonly used in semiconductor power assemblies and bus work. A starter control assembly comprising: The starter control assembly of claim 1 wherein said at least one stationary contact includes at least one stationary contact mounted on each of said heat sinks.
Trigger speed control switch subassembly and method of making. When full voltage operation and reduced heating is desired, solenoid 19a is energized causing shorting bar 15a to contact stationary contacts 14a and 14b mounted on the respective heat sinks 12a and 12b.
One way in which the device of FIG. Such heat can be carried away from the semiconductor devices through the use of heat sinks. This reduction in wear contact that can be achieved by such coordination is especially important where contacts 16a,c,e, 14a,b,c,d,e,f are contact surfaces of the heat sink or coated surfaces on the aluminum heat sink.
The starter control assembly of claim 21 wherein said connector means includes lug means for connecting an electrical conductor and an associated stationary contact rigidly and electrically connected to said lug means, and said lug means and said associated stationary contact being rigidly mounted to said line heat sink and electrically insulated from said line heat sink when said movable line contact is in a disengaged state.
The starter control assembly of claim 5 further comprising electrical solenoid means at least partially extending into the space between said line and load heat sinks.
To sense operation and coordinate the operation of the shunting contact, a switch element, such as limit switch 40, can be mounted to sense the position of the movable contact. Electrical current from the load heat sink 31 is conducted from the assembly via load power lug The starter control assembly of claim 16 having three electric solenoids operably connected to respective said movable shunting contact means.
Electrical power is then available from lug 21 to the incoming heat sink The starter control assembly of claim 19 wherein said solenoid is mounted on at least one of said heat sinks. The starter control assembly of claim 16 having an electric solenoid operably connected to operate at least one of said movable shunting contact means. Use of solid state devices has permitted present solid state motor starters to function without the need for external resistors.