West Control Solutions KS 92-1 - Manual (Page 64)

7 Special functions
7.1 DAC
®
– motor actuator monitoring
(Digital Actor Control DAC ® )
With all controllers with position feedback Yp, the motor actuator can be monito-
red for functional troubles. The DAC
®
function can be started by chosing the pa-
rameter C.Fnc = 5 or 6 at the configuration level ( ConF):
w ConF / Cntr / C.Fnc = 5 3-point-stepping controller with
position feedback Yp as potentiometer
w ConF / Cntr / C.Fnc = 6 Continuous controller with integrated
positioner and position feedback Yp as
potentiometer
If an error occures, the controller switches to manual operation (ò - LED blinks)
and no impulses are given out any longer. If one of the relays shall switch when a
DAC
®
error occures, parameter dAC.A = 1 and inverse action O.Act = 1 must
be selected for the relevant output OUT.1 … OUT.4 in the ConF menu
( OUt.3 and 4 only possible if O.tYP = 0 [relay/logic]):
w ConF / OUt.x / dAc.A = 1 Motor actuator monitoring (DAC) aktive
The system detects the following stepping controller errors:
w defective motor
w defective capacitor (wrong rotating direction)
w wrong phase followers (wrong rotating direction)
w defective force transmission at spindle or drive
w excessive backlash due to wear
w jamming of the control valve e.g. due to foreign body
In these cases the controller will change to manual operation and the outputs will
be switched off. Is the controller switched to automatic operation again or any
modification is done the controller activates the DAC function again and the out-
puts will be setted.
Resetting of a DAC error:
After solving the technical problem the DAC errror can be acknowledged in the
error list. Thereafter the controller works again in normal operation mode.
See also chapter 3.4 "Mainenance manager / Error list", page 12 ff.
Special functions
DAC ® – motor actuator monitoring
64 KS 90-1 / KS 92-1