CONTROL PANELS

Screw Jack offer control systems for screw jack and linear actuator systems. These control panels provide the option of jogging (inching), or maintained operation, when specified as part of a Screw Jack linear positioning system. The control panels are built to international standards to individual customer requirements with numerous options available, consult Screw Jack for details.

Example of Actuator Control System
Two mechanically linked screw jack systems are electronically synchronised for speed and position control using frequency converters (inverter) with integral control card. The inverters control the systems controlling the motion of each motor comparing actual and required performance via a closed feedback loop. This is provided the encoders in each motor feeding back direct to the inverter. Each screw jack system is referenced from a datum point signalled the RLS-51 limit switch on each system. The RLS-51 also provides end of travel limits that are installed for safety. Each frequency converter has an integral motion control card, which are linked together and arranged in a master-slave relationship for control purposes.

This type of system is used where mechanical links to all linear motion components are not possible and where complete motion control is required for a specific process. For example a platform lift here a series of precise positions are required along the screw jacks stroke where the platform must stop for a specified time with variable speeds at the end of each stroke and a certain number of cycles per complete operation. All of which can be programmed into the unit with key user parameters accessible via the control keypad.

For advice on specifying the best solution for your application consult Screw Jack Ltd.