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JL/X130 - 1680
2 Introduction
A slip ring motor is a type of induction motor having a wound rotor connected to slip rings. The stator (U, V,
W) is phase angle controlled by the JL/X in a closed loop with speed feedback derived from a tacho
generator or encoder mounted on the motor shaft. The motor speed/torque characteristic is modified by
resistors connected to the rotor slip rings, controlled by JL/X relay output drivers. Four resistor control
outputs are provided. Generally, only one or two would be used for applications such as slew, yaw or X/Y
travel. Hoist applications might use three or four.
For hoist applications, lowering at speeds above synchronous speed is detected and under this circumstance
rotor resistance is minimised for maximum regeneration into the supply. An additional digital output is
provided for this purpose.
Provision is made for selection of analogue or progressive joystick switch (two raise, two lower speeds)
speed demand. Analogue outputs representing speed, torque and power are supplied in the standard
configuration.
The JL/X range of slip ring motor drives is a derivation of the PL/X Digital DC drive product range. It shares
the same software and hardware platforms and delivers the same precise digital control functionality enjoyed
by users of the established range of DC Drives. The main difference between the PL/X and JL/X range is that
the thyristor stack configuration has been designed to provide a firing angle controlled 3 phase output (U, V,
W) suitable for controlling slip ring motors in either 2 or 4 Quadrant modes. All the fieldbus options and
configuration software packages used with the PL/X are also available for the JL/X range.
The JL/X range covers output currents from 130 to 1650 Amps and is available in 3 frame sizes with
standard supply voltage inputs up to 480VAC. (Frame 2, 4 and 5). Frame 4 and 5 also have the option of
being supplied as HV units that are able to accept AC supply voltages up to 690 VAC for higher voltage
applications. The JL/X range has an overload capability of 150% for 25 seconds.
There is a high duty range called the JL/XHD which has an overload capability of 250% for 25 seconds.
All models have the high current 3 phase supply terminals in standard top entry, with the motor connections
at the bottom of the unit.
