Novus N480, Руководство по эксплуатации, Страница: 7 / 8

N480
7
HIGH
differenti
al
3
SPA1
Negati
ve
SP + SPA1 SP
Alarm ON
TEMPERATURE
SPA1
Positi
ve
SP + SPA1 SP
Alarm
ON
TEMPERATURE
differenti
al or
deviation
4
SPA1
Negati
ve
SP + SPA1 SP - SPA1 SP
Alarm ON
TEMPERATURE
SPA1
Positi
ve SP + SPA1 SP - SPA1 SP
Alarm
ON
Alarm
ON
TEMPERATURE
Input
sensor
error or
heater
break
detection
5 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
6
Activated when the programmed soak time is run out. Refer to item 4 of this manual.
7
Low limit alarm disabled at power-up
8
High limit alarm disabled at power-up
9 Differential low limit alarm disabled at power-up
10
Differential high limit alarm disabled at power-up
Alarm
Function
s
With
alarm
inhibition
at power-
up
11 Differential alarm disabled at power-up
Table 2 - Alarm functions and their identification codes
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.
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
Atvn Atvn
Atvn
” prompt by selecting 1 .
•
Set 1 at the “ rvn rvn rvn 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