Slip ring drives provide digital motor control for cranes
18 November 2010
Sprint Electric is now offering drives for slip ring motors, which are typically used in cranes, where they control both hoist and X/Y movement. The JL/X range of slip ring motor drives is a derivation of Sprint's PL/X digital dc drive product range, sharings the same software and hardware platforms and delivering the same precise digital control.
The main difference is that the thyristor stack configuration has been designed to provide a 3 phase output (U, V, W) suitable for controlling slip ring motors in either 2 or 4 quadrant modes. All the fieldbus options including Profibus, DeviceNet, CC-Link, EtherNet/IP, Modbus and CANopen, and configuration software packages used with the PL/X are also available for the JL/X range.
The JL/X range of slip ring motors covers output currents from 100 to 1,850A and comes in three frame sizes with standard supply voltage inputs up to 480Vac. Overload capability is 150 percent. For high duty applications, the JL/XHD range is available with an overload capability of 250 percent. There is also the option of high voltage units that are able to accept supply voltages up to 690Vac..
All models have the high current 3 phase supply terminals in standard top entry, with the motor connections being bottom entry. The JL/X is supplied configured for crane control as standard with joystick or analogue demand inputs and outputs needed to control up to four external slip ring resistors, together with dedicated outputs for super-synchronous regenerative lowering and brake control.
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