West Control Solutions KS 92-1 - Manual (Page 65)

Functioning of the DAC function
No input filter should be defined for the Yp input ( PArA / InP.x / t.Fx = 0 ).
Therewith no wrong detection of blocking or wrong method of operation can be
recognized.
The automatic calibration can be used with drives outfitted with spring assembly.
Execution of the calibration:
It is controlled if the mean alteration between two messurements is enough for
the DAC monitoring. The calibration will be stopped if the alteration between
two messurements is too small.
The position of 0% is searched. Therefor the drive will be closed until there is no
changing of the input signal for 0,5 sec.
Assuming that the drive is outfitted with spring assembly, the drive is opened for
2,8 sec. The drive should then still be within the spring assembly. This position is
allocated and stored as 0%.
With the same procedure the position for 100% is allocated and stored.
Simultaneously the motor running time is determined and saved as parameter
tt.
Afterwards the controller sets the drive in the position before calibration.
Was the controller in automatic mode before calibration it will be set to automa-
tic mode again otherwise it remains in manual mode.
The following errors can be occure during calibration:
w the change of the Yp input is to small, no monitoring is possible
w the motion is in wrong direction
w the Yp input is broken
In these cases the automatic calibration will be stopped and the controller remains
in manual mode.
g
If the automatic calibration leads to no resonable results the calibration of the Yp
input can be done manual.
g
If the conroller reaches the positions of 0% or 100% the outputs will be switched
off. Also in manual mode it is not possible to exceed these limits.
g
Because no controller with continuouse output and Yp input is defined there
won't be the DAC function for this controlling type.
Special functions
KS 90-1 / KS 92-1 65 DAC ® – motor actuator monitoring