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
monitored for functional troubles. The DAC
®
function can be started by chosing
the parameter
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
outputs will be setted.
Special functions
DAC
®
– motor actuator monitoring
58
Operating manual MIR-491
