NOVUS N1100HC - Manual (Page 7)

N1100HC Controller
NOVUS AUTOMATION 7/7
The program tolerance “ Ptol Ptol Ptol 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).
SV
time T1 T2 T3 T4 T5 T1 T2 T3 T4
SP0
SP1
SP2
SP3
SP4
SP5 / SP0
SP1 SP2
SP3
SP4
Program 1 Program 2
Figure 3 - Example of two linked programs
The ramp and soak event function is used to activate alarms at any
segment of program 1. This applies only to program 1.
To enable this event function the alarms to be activated must be
selected for
rS rS rS rS function and are programmed at the PE 0 PE 0 PE 0 PE 0 to PE 5 PE 5 PE 5 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
0
1 X
2 X
3 X X
4 X
5 X X
6 X X
7 X X X
8 X
9 X X
10 X X
11 X X X
12 X X
13 X X X
14 X X X
15 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 Prn Prn Prn
(0 to 4)
• Start control at the run prompt rvn rvn rvn rvn by selecting YES .
Before executing the program the controller waits for PV to reach the
first set point
SP0 SP0 SP0 SP0 if PtoL PtoL PtoL PtoL is different than zero.
Should any power failure occur the controller resumes at the
beginning of the segment it was previously.
10 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 rvn rvn rvn prompt by selecting NO .
• Select auto mode operation at the Avto Avto Avto 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 Atvn Atvn Atvn prompt by selecting YES.
• Enable the control output at the rvn rvn rvn 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
11 SERIAL COMMUNICATION
An optional RS485 serial communication interface is available which
allows up to 247 controllers in a network to communicate to a master
device.
RS485 Interface
•
Compatible signals with RS485 standard;
•
Two-wire connection from master to up to 247 slave controllers
in a multidrop bus;
•
Maximum communication distance: 1000 meters;
General Characteristics
•
Optically isolated serial interface
•
Programmable Baud rate: 1200, 2400, 4800, 9600 or 19200 bps.
•
Data Bits: 8
•
Parity: None
•
Stop Bits: 1