N1030 Controller
NOVUS AUTOMATION
4/5
PID PARAMETERS DEFINITION
During auto-tuning, the process is controlled in ON/OFF mode at the
programmed setpoint (SP). In some processes the auto-tuning can
take many minutes to complete. The recommended procedure for its
execution is:
•
Set the desired SP value for the process.
•
On the
Atvn
screen, enable automatic tuning by selecting
FAST
or
FULL
.
The
FAST
option performs the tuning in the minimum possible time.
The
FULL
option prioritizes a more precise tuning.
During automatic tuning, the
TUNE
indicator remains lit on the front
of the controller. You must wait until the tuning is finished before you
can use the controller.
During the execution of the automatic tuning, it is possible to induce
PV oscillations in the process around the setpoint.
If the tuning does not result in satisfactory control,
Table 04
presents
guidelines on how to correct the process behavior.
PARAMETER
VERIFIED PROBLEM
SOLUTION
Band Proportional
Slow answer
Decrease
Great oscillation
Increase
Rate Integration
Slow answer
Increase
Great oscillation
Decrease
Derivative Time
Slow answer or instability
Decrease
Great oscillation
Increase
Table 4 –
Guidance for manual adjustment of the PID parameters
For further details, visit our website:
MAINTENANCE
PROBLEMS WITH THE CONTROLLER
Wiring errors and improper programming represent most of the
problems that can occur when using the controller. A final review can
avoid wasted time and losses.
The controller presents some messages that are intended to help
you identify problems.
MESSAGE
PROBLEM DESCRIPTION
----
Open input. No sensor or signal.
Err1
Err6
Connection and/or configuration problems.
Check the wiring and the configuration.
Table 5 –
Error messages
Other error messages displayed by the controller represent internal
damages that necessarily imply sending the equipment for
maintenance.
INPUT CALIBRATION
All controller input types leave the factory already calibrated.
Recalibration is not recommended for inexperienced operators. If it is
necessary to recalibrate an input, proceed as follows:
a)
In the
type
parameter, set the input type to be calibrated.
b)
Program the lower and upper SP limits for the extremes of the
input type.
c)
Access the Calibration cycle.
d)
Enter the access password.
e)
In parameter
(alib
, enable the calibration by setting
YES
.
f)
With an electrical signal simulator, apply to the input terminals a
signal near the lower limit of the configured input measurement
range.
g)
In the
nL(
parameter, use the
and
keys to make the
display indicate the expected value for the applied signal. Then press
the
P
key.
h)
Apply a signal near the
upper
limit of the configured input
measurement range to the input terminals.
i)
In the
ink(
parameter, use the
and
keys to make the
display indicate the expected value for the applied signal. Then,
press the
P
key until returning to the
Temperature Indication
Screen
.
j)
Validate the calibration.
Note:
When checking the controller calibration with a Pt100
simulator, pay attention to the simulator minimum excitation current
requirement, which may not be compatible with the 0.170 mA
excitation current provided by the controller.
