Technical data

Drive functions
7.3 Function modules
Function Manual
Function Manual, 06/2012, 6SL3097-4AB10-0BP4
205
Technology controller
Two scalable setpoints (p2255/ p2256) can be specified via two connector inputs (p2253/
p2254). A ramp-function generator in the setpoint channel can be used to define a ramp by
means of the ramp-up and ramp-down times (p2257/p2258). Both the setpoint and actual
value channels have access to a filter element with configurable time constants (p2261 and
p2265).
The proportional gain (p2280), integral time (p2285) and derivative-action time (p2274) can
be set in the following technology controller. The controller itself has access to two controller
type modes dependent upon p2263:
● PI controller with derivative component in actual value channel (p2263 = 0; factory
setting)
With this type of controller, changes to actual values caused by a change in the
disturbance variable will generate a stronger reaction from the final controlling element
(on account of the derivative component) . The effect of abrupt changes to setpoints (no
ramp) on the control process is tempered by the reaction of the final controlling element
(thereby reducing the load on the final controlling element). The derivative component
can also be used to compensate the delay generated by the upstream smoothing of a
noisy actual value signal.
Figure 7-34 Controller structure of the PI controller with derivative component in the actual value
channel
● Technology controller (p2263 = 1)
Here, the derivative component is generated from the system deviation; as such, a
setpoint change will generate an abrupt change in the final controlling element. Changes
to disturbance variables are also compensated more quickly due to the action of the
derivative component.
Figure 7-35 Controller structure of the PID technology controller when p2263 = 1
Please note that the controller structure of the technology controller differs from the standard
technology controller structure described below, which is standard in some sources. To
enable comparison, the corresponding conversions have been specified: