Novus Controller N2000 Uživatelský manuál stáhnout pdf (Strana 7)

NOVUS AUTOMATION 7/9

RAMP AND SOAK PROFILE PROGRAM

Seven ramp and soak profiles with up to 7 segments each can be

programmed. Longer profiles of up to 49 segments can be created by

linking 2 or more profiles.

time

SP0

SP1

SP2

SP3

SP4

SP5

SP6

SP7

Figure 11 - Example of a complete ramp and soak profile

To execute a profile with fewer segments just program 0 (zero) for the

time intervals that follow the last segment to be executed.

time

SP0

SP1

SP2

SP3

T4=0

Figure 12 - Example of a profile with fewer segments. (T4 is set 0)

The program tolerance “Ptol

PtolPtol

Ptol” defines the maximum deviation

between PV and SV for the execution of the profile. If this deviation is

exceeded, the program will be interrupted until the deviation falls to

within the tolerance band.

Programming 0 (zero) at this prompt disables the tolerance and the

profile execution will not to be halted even if PV does not follow SV

(time priority as opposed to SV priority).

The ramp and soak event function is used to activate alarms at any

segment of program 1. This applies only to program 1.

LINK OF PROGRAMS

It is possible to create a more complex program, with up to 49

segments, joining the seven programs. This way, at the end of a

program execution the controller immediately starts to run another one.

When a program is created, it must be defined in the “LP

LPLP

LP" screen

whether there will be or not another program.

To make the controller run a given program or many programs

continuously, it is only necessary to link a program to itself or the last

program to the first.

time

SP0

SP1

SP2

SP3

SP4

SP5 / SP0

SP1

SP2

SP3

SP4

Program 1

Program 2

Fig. 13 - Example of two linked programs

EVENT ALARM

To enable this event function the alarms to be activated must be

selected for rS

rSrS

rS function and are programmed at the PE

PEPE

PE 0

0 to PE

PEPE

PE 5

prompts. The number to be programmed at the prompt defines the

alarms to be activated (Table 5).

CODE ALARM 1 ALARM 2 ALARM 3 ALARM 4

X X

X X X

X X

1010

X X

1111

X X X

1212

X X

1313

X X X

1414

X X X

1515

X X X X

Table 5 - Event codes for ramp and soak

To configure and execute a ramp and soak program:

•

Program the tolerance value, SV, time and event.

•

If any event alarm is required program the ramp and soak event

function.

•

Set the control mode to automatic.

•

Select ramp and soak program to be executed at prompt Prn

PrnPrn

Prn

(0 to 7)

•

Start control at the rvn

rvnrvn

rvn prompt by selecting YES.

Before executing the program the controller waits for PV to reach the

first set point SP0

SP0SP0

SP0 if PtoL

PtoLPtoL

PtoL is different than zero.

Should any power failure occur the controller resumes at the

beginning of the segment it currently is.

AUTO TUNE

During auto tune the process is controlled in ON/OFF mode at the

programmed SetPoint (SV). Depending on the process

characteristics large oscillations above and below SV may occur and

auto tuning may take several minutes to be concluded.

The recommended procedure is as follows:

•

Disable the control output at the rvn

rvnrvn

rvn prompt by selecting NO.

•

Select auto mode operation at the Avto

AvtoAvto

Avto prompt by selecting YES.

•

Disable the ramp and soak function (select NO) and program a new

SV value other than the present PV (close to the desired set point).

•

Enable auto tuning at the Atvn

AtvnAtvn

Atvn prompt by selecting YES.

•

Enable the control output at the rvn

rvnrvn

rvn prompt by selecting YES.

During the auto tune procedure the soft-start function will not operate

and large oscillations will be induced around the setpoint. Make sure the

process can accept these oscillations and fast control output changes.

If auto tuning results are not satisfactory refer to Table 6 for manual

fine tuning procedure.

PARAMETER RESPONSE SOLUTION

Slow Response Decrease Proportional Band

Large Oscillation Increase

Slow Response Incre ase Integral Rate

Large Oscillation Decrease

Slow Response or Instability Decrease Derivative Time

Large Oscillation Increase

Table 6 - Suggestions for manual tuning of PID parameters

1 2 3 4 5 6 7 8 9

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