Honeywell Universal Digital Controller UDC 3300 Manual de usuario descargar pdf (Pagina 193)

4/00 UDC 3300 Controller Product Manual 181

5.15 Operating Two Loops of Control

Loop operation

Operation of two individual loops of control is identical to operating a

single loop of control except that TUNING 2 group applies to Loop 2 only

and two PID sets, 3 and 4, are available. TUNING group applies to Loop

1 with PID sets 1 and 2 applicable.

Operating modes and

setpoint source

The rules for Auto/Manual modes and changing setpoint sources are the

same as single loop operation.

Keyboard operation

Note that the loop being displayed is the only loop affected by normal

keyboard operation. However, either loop can be reconfigured when in the

Set Up mode regardless of which is being displayed during normal

operation.

Accutune

Two independent loops or cascaded loops can be tuned at the same time,

if configured.

Setpoint ramp or SP

programming

Either loop or both loops can be configured for a single setpoint ramp

operation by enabling the desired loop or loops (see Section 3 –

Configuration).

An “H” or “R” will appear when applicable, depending upon which loop

is being displayed.

The RUN/HOLD operation is shown in Table 5-15 Procedure for Running

a Setpoint Ramp.

Digital inputs (remote

mode switching)

Digital Input 2 is dedicated to Loop 2 and Digital Input 1 is dedicated to

Loop 1 when two loops or Cascade control is configured.

Output override Hi/Lo

select

Output Override allows you to select the higher of Output 1 and Output 2

(Hi Select) or the lower of Output 1 and Output 2 (Lo Select) to appear at

Output 1 terminals to drive the final control element. Refer to Section 5.12

for Override rules and block diagram.

Override prompts appear under the Algorithm Set Up group, function

prompt OUT OVRD.

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Honeywell Universal Digital Controller UDC 3300 Manual de usuario Pagina 193