Fisher DPR900 User Manual page 67

[FISHER")
Configuration
5-13
Function FCODE Option
133 Not connected
Conneded to A14
Connected to Al3
No. Default Selected
V&F?
V&e
1 1
2
3
Fisher Controls recommends the use of actuator
feedback whenever possible. If no actuator
feedback potentiometer is used, the user must
short A01 on the connection terminal block. This
will prevent an open-circuit alarm (Err 4) from
being generated.
If required, the controller can be configured to supply the feedback
potentiometer with current from A01 (when not used for other
purposes). Use FCODE 29 to select the current supplied to the
potentiometer.
Function Parameters FCODE Range Unit Increment Default Selected
Value Vallle
Potentiometer Current
output 29
c-20 mA 0.1 mA 5mA
Feedback
The potentiometer signal received at Al4 can be amplified by using
FCODE 30 The selected current multiplied by the potentiometer
resistance must result in a voltage drop of 5V (i.e. the feedback signal
from the potentiometer must be 0-5V for l-100% actuator
positioning.
Use FCODE 31 to set a zero-level offset for the potentiometer.
Function Parameters FCODE Range Unit Increment Default Selected
Value Value
Actuator Gain 30 O-9.99 - 0.01
1
Feedback Zero offset
31
+100 %
1% 0
Signal
Change 1 -September 1991 UM6.1:DPR900:9102