Fisher DPR900 User Manual page 66

5
12
Configuration
FCODE 28
lunnino Time l-l
I I -
When the user sets FCODE 102 to Option 2, the controller sends
raise/lower pulses out on signal lines DO5 (increasing output) and
DO6 (decreasing output). If both discrete signals are active at the
same time, the controller takes no action.
When using the positioning motor output option,
the user must ensure that the controller's PID
parameters are configured to have integral (reset)
action. This option cannot function in P only or PD
only controller applications.
Use FCODE 27 to specify a positioning motor error signal deadband.
Any required controller adjustment shorter than the chosen deadband
does not result in controller regulation. In addition, the controller
incorporates a block that prevents the control motor from changing
direction more often than every other second.
Use FCODE 28 to set the controller running time. This is defined as
the actual ON time required to stroke the valve/motor from 0 to 100%
or 100 to 0%.
Function
E
Options For
Output
Positioning
Motor
i
Parameters
Raise/Lower
Deadband
Running time for
O-100% chanse
FCODE Range Unit Increment Default Selected
V&N3 V&le
27 L?-9.9
% 0.1% 0.5
26
l-999 s 1s 60s
Several available selectable controller functions require the use of an
actuator feedback potentiometer for the function to be fully utilized.
Those functions include Autotuning, Feedforward, Restart value,
output signal limiting and forced control. The actuator signal will be
shown on the small bargraph on the right side of the faceplate. If no
position feedback is available to the controller, the bargraph displays
0%. Use FCODE 133 to enable the actuator feedback option.
UM61:DPR900:9102
May 1991