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1/03 UDC 6300 Process Controller Product Manual 183

5.14 Operate 2 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 re-configured when in

the Set Up mode regardless of which is being displayed during normal

operation.

Accutune

Adaptive tune

Two independent loops or cascaded loops can be Adaptive tuned at the

same time, if configured.

Setpoint Ramp

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 5-18 “Running a Single

Setpoint Ramp”.

Digital inputs

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

Input 3 are dedicated to Loop 1 when two loops or Cascade control is

configured.

Digital Inputs 4, 5, and 6 can be assigned to either loop.

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 Subsection 5.11 for Override rules and block diagram.

Override prompts appear under Set Up group “ALGORTHM” and

function prompt “OUT OVRD”.

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United Security Products AVD-45c Handbuch Seite 197