United Security Products AVD-45c Manual descargar pdf (Pagina 227)

1/03 UDC 6300 Process Controller Product Manual 213

5.23 Auto/Manual Station, Continued

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 LSP2.

• 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, LSP1, 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 watch dog opens the

digital input switch and UDC 6300 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).

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United Security Products AVD-45c Manual Pagina 227