United Security Products AVD-45c Manual Pagina 97

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1/03 UDC 6300 Process Controller Product Manual 83
4.6 Algorithm Data Set Up Group, Continued
Table 4-5 Algorithm Group Definitions, continued
Lower Display
Prompt
Upper Display
Range of Setting
or Selection
Parameter
Definition
CONT ALG
(continued)
ON-OFF
(continued)
DUPLEX ON/OFF is an extension of this algorithm when
the output is configured for Duplex. It allows the
operation of a second ON/OFF output. There is a
deadband between the operating ranges of the two
inputs and an adjustable overlap (hysteresis) of the on
and off states of each output. Both Deadband and
Hysteresis are separately adjustable. With no relay
action the controller will read 50%.
Other prompts affected: “OUT HYST” and “DEADBAND”
PID A
NOTE: PID A should not
be used for Proportional
only action. i.e. no integral
(reset) action. Instead,
use PD+MR with rate set
to 0.
PID A is normally used for three-mode control. This
means that the output can be adjusted somewhere
between 100% and 0%. It applies all three control
actions — Proportional (P), Integral (I), and Derivative
(D) — to the error signal.
Proportional (Gain)
— regulates the controller’s output in
proportion to the error signal (the difference between
Process Variable and Setpoint).
Integral (Reset
) -- regulates the controller's output to the
size of the error and the time the error has existed. (The
amount of corrective action depends on the value of
proportional Gain.)
Derivative (Rate)
-- regulates the controller's output in
proportion to the rate of change of the error. (The
amount of corrective action depends on the value of
proportional Gain.)
PID B
PID B Unlike the PID-A equation, the controller gives
only an integral response to a setpoint change, with no
effect on the output due to the gain or rate action, and it
gives full response to PV changes. Otherwise controller
action is as described for the PID-A equation. See note
on PID-A.
PD+MR
PD WITH MANUAL RESET is used whenever integral
action is not wanted for automatic control. The 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
• PD (Two Mode) control,
• P (Single Mode) control.
Set Rate (D) to 0.
Other prompts affected: "MAN RSET" in the “Tuning” Set
up group.
Table 4-5 continued on next page
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