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4/00 UDC 3300 Controller Product Manual 191
Description
The “AM STA” selection of digital input creates a repeater station when
the digital input is closed. This is accomplished by a multi-selection from
the digital input menu.
•“ACTION” is forced as “DIRECT”.
•“CONT ALG” is forced as “PD+MR”.
• Active setpoint is forced to 2SP.
• The PV is switched to “PV 2IN”.
• The tuning parameters used are the second set of parameters.
When the switch is open the unit becomes a normal controller with
“CONT ALG” of “PID A”, using tuning parameters set 1, SP, PV as IN1
and “DIRECT” or “REVERSE” as selected by customer configuration.
Input 1 is typically the PV of some upper controller and Input 2 is
typically that controller’s output. If the upper control fails, the upper
device or some watchdog opens the digital input switch and UDC 3300
back-up PID A control is active.
When the upper control reactivates, the digital input switch is closed and
the Auto/Manual Station becomes a repeater station and allows the upper
control output signal to pass through.
Configuration
There are some things to consider when configuring the controller.
The PV range stays as the IN1 range, even while IN2 is the PV when the
switch is closed; therefore:
• The IN2 HI must be less than or equal to the IN1 HI.
(Suggest: IN2 HI = 100.0)
• The IN2 LO must be greater than or equal to the IN1 LO.
(Suggest: IN2 LO = 0.0)
• The TUNING GAIN2 must be equal to
(IN1 HI – IN1 LO) / (IN2 HI – IN2 LO).
Configuration
Refer to Table 5-33 and set up the controller in the order shown.
Table 5-33 Auto/Manual Station Mode Configuration Procedure
Step
Press
SET
UP
to Select Set
Up Group
Press
FUNC
to
Select
Function
Prompts
Press
▲ ▼
to Enter
Value or
Selection
Remarks
1 Control
PID SETS 2KEYBD
LSP’STWO
SP TRACK NONE
Select other control parameters as needed by the
application.
2 Algorithm
CONT ALG PD+MR This allows setting of the Manual Reset value.
3 Tuning
MAN RSET 0 Manual reset of 0 for no output bias and requires
LSP2 = 0 %. If bias is required, set MR to equal the
desired output bias value.