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