The SKV control system for kinetic effects in the event sector

System description

The SKV control system is a computer supported positioning system for motor drives in the event sector. It is adjusted to the specific standards: under compliance of all security demands, it combines a short assembly- and show-programming time with high flexibility and error safe operation even in a rough environment. Up to 64 drives of all kinds can be controlled simultaneously by one system, supported by over 500 actuator- outputs and over 500 sensor-inputs. The synchronization with light-, sound-, video- and pyro-technology, as well as with other SKV-systems, occurs via time code connections.

SKV control system use industrial computers for the operation. It enables the operator to observe all drives at once and to react automatically or manually in every situation. The program to be created for each show event is clearly displayed in modular form and even makes short term modifications possible. In the online-operation it controls all drives and shuts down all drives in the case of any errors or disturbances.

In the SKV-system each computer is assigned to a data-link (DL II). It receives the time-code and communicates with all drives over the STAGEBUS protocol. An integrated emergency-stop button can switch off the system and power down all drives.

Stage Kinetik GmbH developed the STAGEBUS protocol for the data exchange with all operations. Through this several system configurations can be realized. Therefore it is possible, in combination with the "Bus Transmission Controllers" (BTC's), to transfer data safely through busbar contacts. Drive systems without trailing cables and several additional functions are also possible. Via a data splitter (DS16) a computer-data line can be distributed to 16 drives. In addition each DS16 comprises a manual control (for example for the start up), in order to drive individual operations without a computer. The distance between drives and SKV controlling systems can be many 100 yards or more.

Each drive possesses a "drive management controller" (DMC2) with a STAGEBUS connection, by which its frequency converter is controlled. Through the DMC2 the motor position will determined by means of an absolute- or incremental-transmitter. In addition it has an input for a weight measuring cell. Through DMC2, additional functions can be implemented for further binary in- and outputs. All data are processed in the DMC2 and controlled for set limit points if necessary. Moreover, a watchdog controls the uninterruptible communication with the computer. Because the cyclic processing of all parameters in the DMC2 occurs 1000 times per second, the system has a very short reaction time for exact motion processing.

The system is expandable for additional demands. Therefore there is a circuit board (S16) with 16 binary in- and outputs each, and a stepper motor-controller (SMB). These components round up the technical range of activities and benefits for a perfect show.


SKV control system
View of the variably creatable user interface of the SKV control system.

View of the variably creatable user interface of the SKV control system. The philosophy of the appliance is that the operator is displayed all relevant control information at once on a screen. So the complete system condition (with the simultaneous display of all operations) can be viewed at once. All operations can be arranged optionally at any background on the screen, for example as they are set up on stage. The editing fields and the manual control panel could be optionally arranged as well. In addition important general system information is displayed on the screen edge. Most one-time parameterizations occur via separate sub menus.

At initiation, each operation obtains a specific parameter rate. Among other things it contains the minimal acceleration- and brake ramps, the limit switch, the maximum speed and the type of position logging. The parameters could be adjusted comfortably. They assure that all parts of the system inside the allowed operation parameter work, and limits cannot be exceeded at manual operation.

Subsequently, in the scene-editor the individual target position of the operation are connected with the drive parameters (speed, acceleration- and break ramps) and signals at the binary outputs of the DMC2 are entered. Optionally connected operations could be simultaneously set into a scene entry. Therefore each scene describes a desired target state with all motion processes leading to it.

So the complete motion process of a show is produced in a time machine depends on the time the individual scenes could be selected. This occurs via an applied time-code, as well as via an intern time-code generator. The process can be stopped at any time and if necessary it can be locked. Moreover it can be switched to another show process, or be substituted through a manual control. On the other hand the show process within a loop can always be automatically started and therefore run as long as desired.

Each DMC2 can be assimilated in the manual control panel, so the selected drive can be manually operated. All scenes can be started directly and cancelled manually. In addition several leaps in the time machine are possible. The operator has the option to intervene manually in all functions and to adjust the drive-motions to the show at any time. Therefore, unpredictable situations can be controlled and short-term demands can be handled flexibly.

Application examples

Innovative solutions were developed in the fields of system technology, electro technology and mechanics, which together make extraordinary general concepts possible. Supervised by an experienced and well rehearsed team, individual solutions can be realized. Because Stage Kinetik works with self-developed technology, upcoming problems can be solved very quickly. System specific modifications can be implemented by constructors, developers and technicians directly.

The following illustration displays several application examples: