IC3012N Stepless-type, Desk-mounted

WHERE TO USE

Use on cranes, electric shovels, steel mills and other variable speed drives.

The selection of the stepless element should be based on the required power of the reference signal.

The compactness of the switch and its desk-mounting feature not only save valuable cab space, but provide for better visibility and efficiency of the operator. This is particularly desirable where the operator has numerous motions to control. This master switch can be mounted on a desk or console or it can be furnished with NEMA 1, pedestal-type, free-standing enclosure.

SEVERE-DUTY APPLICATIONS

All IC3012N master switches include sealed ball bearings throughout. These sealed ball bearings protect heavy wear points against dirt and dust, and provide longer life, smoother operation, and less maintenance. This standard feature is particularly advantageous in severe-duty applications such as electric power shovels and draglines.

RHEOSTAT TYPE

For use in circuits requiring stepless elements with output capacity of 100 watts. This switch is available with maximum of 8 independent circuits and maximum of two rheostat elements mounted on the bottom.

Each four-inch rheostat element is rated 100 watts maximum with standard ohmic values.

STANDARD POTENTIOMETER TYPE

For use in circuits requiring a stepless element with output capacity of 2 watts. This switch is available with maximum of 4 independent circuits. Standard offering includes one 2-watt potentiometer mounted on bottom of switch with standard ohmic values.

SEVERE SHOCK AND VIBRATION POTENTIOMETER TYPE

This switch is available with maximum of 8 independent circuits and includes one 2.5-watt 2500-ohm potentiometer.

INDUCTION TYPE

The IC3012 stepless induction master switch consists of the popular IC3012N desk-mounted master switch with a diffential transformer mounted on the end of the shaft. The differential transformer consists of a stator with three coils and a uniquely shaped rotor. As the handle position is changed, the rotor changes the amount of coupling between the three coils of the stator and produces an output. In the low-speed range where fineness of control is desired, a large change in handle position provides a small change in output. At high speeds where a fast response is required, a small change in handle position provides a large change in output.

The neutral, or OFF position, is notched to provide positive position ‘‘feel.’’ All other points are un-notched to provide the operator with a truly smooth, stepless ‘‘feel.’’ The switch produces no torque to oppose movement of the handle, minimizing operator fatigue. Contacts are used for directional purposes to select the reversing contactors.

The primary coil has a maximum rating of 125 volts. Any change in the input voltage will directly affect the output characteristics.