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Controller N1200

NOVUS AUTOMATION 3 / 13

Using the Alarm 1 as example.

•

difk

– Alarm of Maximum Differential Value

Triggers when the value of PV is above the defined point by:

(SP + SPA1)

Using the Alarm 1 as example.

SCREEN TYPE ACTUATION

Off

Inoperative Output is not used as alarm.

Ierr

Open sensor

(input Error)

Activated when the input signal of PV is

interrupted, out of the range limits or Pt100

in short-circuit.

Event (

amp and

Soak)

Activated in a specific segment of program.

rfail

Resist. burnt out

(resistance fail

)

Signals a failure in the heating element.

Minimum value

(Low)

SPAn

Maximum value

(High)

SPAn

Dif

Differential

(diFerential)

SV + SPAn

SV - SPAn

SV + SPAn

Positive SPAn Negative SPAn

Difl

Minimum

Differential

(diFerential

Low)

Positive SPAn Negative SPAn

SV - SPAn

Difk

Maximum

differential

(diFerential

High)

SV + SPAn

Positive SPAn Negative SPAn

Table 3 – Alarm Functions

Where SPAn refers to Setpoints of Alarm “

SPA1

”, “

SPA2

”,

“

SPA3

” and “

SPA4

”.

ALARM TIMER MODES

The controller alarms can be configured to perform 3 timer modes:

• One pulse with defined duration;

• Delayed activation;

• Repetitive pulses;

The illustrations in Table 4 show the behavior of the alarm output for

various combinations of times t1 and t2. The timer functions can be

configured in parameters

A1t1

A1t2

A2t1

A2t2

A3t1

A3t2

A4t1

and

A4t2

OPERATION

T 1 T 2 ACTION

Normal

Operation

0 0

Alarm Event

Alarm

Output

Activation for

a defined time

1 to 6500 s

Alarm Event

Alarm

Output

Activation with

delay

0 1 to 6500 s

Alarm Event

Alarm

Output

Intermittent

Activation

1 to 6500 s

Alarm Event

Alarm

Output

Table 4 – Temporization Functions for the Alarms

The LEDs associated to the alarms will light when the alarm

condition is recognized, not following the actual state of the output,

which may be temporarily OFF because of the temporization.

INITIAL BLOCKING OF ALARM

The initial blocking option inhibits the alarm from being recognized if

an alarm condition is present when the controller is first energized (or

after a transition from run YES NO). The alarm will be enabled

only after the occurrence of a non-alarm condition followed by a new

occurrence for the alarm.

The initial blocking is useful, for instance, when one of the alarms is

configured as a minimum value alarm, causing the activation of the

alarm soon upon the process start-up, an occurrence that may be

undesirable.

The initial blocking is disabled for the sensor break alarm function.

EXTRACTION OF THE SQUARE ROOT

With this feature enabled the controller uses for display and control a

value that corresponds to the square root of the applied input signal.

Available only for the inputs belonging to the group of linear analogic

signals: 0-20 mA, 4-20 mA, 0-50 mV, 0-5 V and 0-10 V.

ANALOG RETRANSMISSION OF PV AND SP

The analog output, when not used for control purposes, is available

for retransmitting the PV and SP values in 0-20 or 4-20 mA. This

analog output is electrically isolated from other inputs and outputs.

The analog output signal is scalable, with the output range defined by

the values programmed in the parameters “

rtLL

” and “

rtkL

”.

To obtain a voltage output, the user must install a resistor shunt (550

Ω max.) to the current output terminals (terminals 7 and 8). The

actual resistor value depends on the desired output voltage span.

SOFT-START

The soft-start feature avoids abrupt variations in the power delivered

to the load regardless of the system power demand. .

This is accomplished by defining a limiting ramp for the control output.

The output is allowed to reach maximum value (100 %) only after the

time programmed in the soft-start parameter has elapsed. The Soft-

start function is generally used in processes that require slow start-up,

where the instantaneous application of 100 % of the available power to

the load may cause damages to parts of the system.

In order to disable this function, the soft-start parameter must be

configured with 0 (zero).

REMOTE SETPOINT

The controller can have its Setpoint value defined by an analog,

remotely generated signal. This feature is enabled through the

channels I/O3, I/O4 or I/O5 when configured as digital inputs and

configured with the function

rsp

(Remote SP selection) or through

the parameter

E.rsp

. The remote setpoint input accepts the signals

0-20 mA, 4-20 mA, 0-5 V and 0-10 V.

For the signals of 0-20 and 4-20 mA, a shunt resistor of 100

Ω

required between terminals 9 and 10, as shown in Figure 4c.

CONTROL MODE

The controller can operate in two different manners: Automatic mode

or Manual mode. In automatic mode the controller defines the amount

of power to be applied on the process, based on defined parameters

(SP, PID, etc.).

In the manual mode the user himself defines this amount of power.

The parameter “

(trl

” defines the control mode to be adopted.

PID AUTOMATIC MODE

For the Automatic mode, there are two different strategies of control:

PID control and ON/OFF control.

PID control has its action based on a control algorithm that takes into

account the deviation of PV with respect to SP, the rate of change of

PV and the steady state error.

On the other hand, the ON/OFF control (obtained when Pb=0)

operates with 0 % or 100 % of power, when PV deviates from SP.

The determination of the PID parameters (Pb, Ir and Dt) is described

in the item DETERMINATION OF PID PARAMETERS of this manual.

1 2 3 4 5 6 7 8 ... 12 13

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Novus Controller N1200 Manual de usuario Pagina 3

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