ABB ASTAT Manual AST10_054 Crane motion controller

Speed Control Related Functions

Multiple speed control modes: Provides two modes of speed control and acceleration control. In speed control mode, the speed is precisely controlled by PID regulator, and the control parameters can be adjusted according to different working conditions. Acceleration control mode is more suitable for driver-controlled travelling movement, where the driver's operation can directly affect the acceleration, and can be smoothly switched to speed control mode when encountering limit switches.

Speed reference and optimisation: The speed reference system supports a variety of inputs, including potentiometers or stepper main switches. The analogue reference can be shaped and acceleration and deceleration ramp times can be set to suit different conditions. In addition, a variety of speed-related optimisation functions are available, such as reducing speed when approaching limit switches, limiting the maximum speed to maintain the effectiveness of the speed controller, and automatically adjusting ramp times for weak power conditions.

Other special functions

Master-slave control function: In the master-slave control system, it is possible to achieve co-operation between different ASTATs. However, it is necessary to pay attention to the super-synchronous mode and the limitation conditions of shared movement, and at the same time, there are specific requirements for the setting of speed and limit switches, so as to ensure the synchronisation and safety of master and slave equipment in the process of movement.

Standby and Emergency Functions: There is a bypass function that enables standby mode in case of partial equipment failure, such as using one motor for rescue operations. There is also a quick-stop function, which allows electrical braking independently of the master switch in case of emergency, guaranteeing the safety of equipment and personnel .