Novus Controller N480 Bedienungsanleitung PDF herunterladen (Seite 3)

Controller N480

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4. RAMP TO SOAK FUNCTION CHARACTERISTICS

This function makes the process temperature rise gradually from the

starting point (present PV) to the temperature value set in “ SP

SPSP

SP “

(Ramp). The user defines the rate of rise in degrees per minute at

the “rAtE

rAtErAtE

rAtE” prompt.

When SP is reached the temperature is leveled at this point for 1 to

9999 minutes as programmed at the “ t SP

t SPt SP

t SP ” prompt. Setting 0

(zero) at “ t SP

t SPt SP

t SP ” defines an infinite length soak profile.

To disable the ramp function Set 0.0 at the “rAtE

rAtErAtE

rAtE” prompt. To

disable the soak function set 1 at the “ t SP

t SPt SP

t SP ” prompt (thus making

a 1 minute soak) and the control output will go off in 1 minute. To

restart control set 1 at the “ rvn

rvnrvn

rvn ” prompt.

After a power failure the controller will resume ramp to soak

execution at the equivalent previous ramp point. If the proces

temperature is the same as the SP (no temperature drop) the

controller will repeat the soak segment.

SoakTemperature

Ramp

Time

Figure 2 - Ramp to Soak Function

5. PROBLEMS WITH THE CONTROLLER

Connection and configuration errors state for most of the problems in

using the controller. A final revision of parameters will save time and

further losses.

Error messages are displayed to help the user to identify possible

problems.

: Process temperature is below the selected sensor

range.

: Process temperature is above the selected sensor

range

: Controller or sensor error. Example:

• Broken thermocouple or Pt100.

• Pt100 badly connected, short-circuited or high cable

resistance.

5.1. ELECTRONIC SERIAL NUMBER VISUALIZATION

To read the 8-digit serial number go to the Operation Level and

press the

key for 3 seconds. The display will show the first 4

digits. Keep the

key pressed for 3 seconds and the display will

show the last 4 digits.

FIRST 4 DIGITS

SERIAL NUMBER

LAST 4 DIGITS

When powering the unit the display will show the software version

for a few seconds.

6. ALARM FUNCTIONS

Low and high alarms are used to signal minimum and maximum

temperature values as programmed in the “SPA1

SPA1SPA1

SPA1” ande “SPA2

SPA2SPA2

SPA2”

prompts.

Differential alarms are used to indicate deviations from the desired

setpoint (SP) temperature. These deviations are programmed at the

“SPA1

SPA1SPA1

SPA1” and “SPA2

SPA2SPA2

SPA2” prompts.

Error alarm shows sensor defects or not properly connected.

Alarm hysteresis is fixed and factory set as described below:

• Pt100: 1.1ºC

• Thermocouples: type J: 1.3ºC; types K and S: 2.3ºC

6.1. ALARM INITIAL BLOCKING

The initial blocking option inhibits the alarm from being recognized if

an alarm condition is present when the controller is first energized.

The alarm will actuate only after the occurrence of a non alarm

condition followed by a new occurrence for the alarm.

Table 2 shows each alarm function operation with their respective

code. Alarm 1 is used as an example.

TYPE CODE ACTION

LOW

SPA1

Alarm ON

TEMPERATURE

HIGH

SPA1

Alarm ON

TEMPERATURE

LOW

differential

SPA1

Negative

SP + SPA1SP

Alarm ON TEMPERATURE

SPA1

Positive

SP + SPA1 SP

Alarm

TEMPERATURE

HIGH

differential

SPA1

Negative

SP + SPA1 SP

Alarm ON

TEMPERATURE

SPA1

Positive

SP + SPA1SP

Alarm

TEMPERATURE

differential

deviation

SPA1

Negative

SP + SPA1SP - SPA1 SP

Alarm ON

TEMPERATURE

SPA1

Positive

SP + SPA1SP - SPA1 SP

Alarm

TEMPERATURE

Input

sensor

error or

heater

break

detection

Alarm is ON whenever:

• Temperature is below/above selected range;

• Termocouple or Pt100 is broken;

• Pt100 is shorted;

• Pt100 is badly connected or wire impedance is

too high;

• The heater resistence is broken

End of

Program

Activated when the programmed soak time is run

out. Refer to item 4 of this manual.

Low limit alarm disabled at power-up

High limit alarm disabled at power-up

Differential low limit alarm disabled at power-up

1010

Differential high limit alarm disabled at power-up

Alarm

Functions

With alarm

inhibition a

power-up

1111

Differential alarm disabled at power-up

Table 2 - Alarm functions and their identification codes

7. PID AUTO TUNE

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

the programmed Set Point (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:

• Program a new SP close to the desired final temperature

other than the present measured temperature.

• Enable the auto tune at the “Atvn

AtvnAtvn

Atvn” prompt by selecting 1.

• Set 1 at the “rvn

rvnrvn

rvn” prompt.

During auto tune large oscillations will be induced around the

setpoint. Make sure the process can accept these oscillations.

If auto tuning results are not satisfactory refer to table 3 for manual

fine tuning procedure.

PARAMETER RESPONSE SOLUTION

Proportional Slow Response Decrease

Band Large Oscillation Increase

Integral Slow Response Increase

Rate Large Oscillation Decrease

Derivative Slow Response or

Instability

Decrease

Time Large Oscillation Increase

Table 3 - Suggestions for manual tuning of PID parameters

1 2 3

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