Function Prompt
Selections or Range of
Setting
Parameter Definition
equation is computed with no
integral contribution. The MANUAL
RESET, which is operator
adjustable, is then added to the
present output to form the
controller output.
Switching between manual and
automatic mode will be bumpless.
If you select PD with Manual Reset
you can also configure the following
variations:
l
PD (Two Mode) control,
l
P (Single Mode) control.
Set Rate (D) to 0.
ATTENTION: Other prompts
affected: MAN RSET in the
Tuning Set Up group
Three Position Step Three Position Step —The Three
Position Step Control algorithm
allows the control of a valve (or
other actuator) with an electric
motor driven by two controller relay
outputs; one to move the motor
upscale, the other downscale
without a feedback slidewire linked
to the motor shaft. The deadband is
adjustable in the same manner as
the duplex output algorithm.
The Three Position Step Control
algorithm provides an output
display (OUT) which is an estimated
motor position, since the motor is
not using any slidewire feedback.
Although this output indication is
97
Chapter 4 - Configuration
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