Functions
5.10 Technological functions
Frequency inverter
144 Operating Instructions, 08.10. 2008, t.b.d.
Parameter Description
P2350 =
…
Enable signal for self-optimization
P2354 =
…
Monitoring time for self-optimization
P2355 =
…
Offset for self-optimization
r2260 Setpoint after ramp-function generator
P2261 Time constant for the setpoint filter
r2262 Filtered setpoint after ramp-function generator
r2266 Filtered feedback
r2272 Feedback after smoothing and function processing
r2273 Controller deviation (difference between setpoint and feedback)
r2294 Output value of controller
For more information about this function, see function diagram 5100 in the List Manual.
5.10.4 Positioning down ramp - a basic positioning function
Description
In certain cases (e.g. when a conveyor belt is brought to a standstill), the belt may have to
travel a defined deceleration distance after shutdown regardless of the speed so that it
always stops in the same position.
Normally, the number of rotations that the motor requires to reach standstill depends on the
motor speed at the instant that it is switched-off. Using the "positioning down ramp" function,
the number of revolutions down to standstill can be defined independent of the speed. This is
realized by extending the ramp-down time of the motor after it has been switched-off so that
a specific number of motor revolutions is always reached. To realize this, the frequency
inverter has a positioning function that is sufficient for many applications.
The accuracy of this function can be increased by means of a motor encoder.
Table 5- 45 Parameters for the simple positioning function
Parameter Description
P2480 = … Control command for the positioning function
Example: When P2840 = 722.0, the positioning function is activated via digital input
0.
P2481 = …
P2482 = …
Gear ratio = P2481/P2482
P2484 = … Number of shaft revolutions at the gearbox output for one distance unit
P2488 = … Number of distance units until the end position
P2487 = … Additive compensation value for increasing accuracy
For more information about this function, see the List Manual.
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