NXS Form 63-2600, Users Manual, Technical Data - CONTROL ...

128 Description of Parameters Honeywell
Hz
PID output
Error value
10% I-Part=5 Hz/s
10%
I-Part=5 Hz/s
10%
I-Part=5 Hz/s
10%
Error=10%
I-Part=5 Hz/s
I-Part=5 Hz/s
1s
NX12k70
Figure 8-3. PID controller function as I-controller.
t
Example 2:
Given values:
Par. 2.1.12, P = 100%
Par. 2.1.13, I-time = 1.00 s
Par. 2.1.14, D-time = 1.00 s
Error value (setpoint – process value) = ±10%
Min freq. = 0 Hz
Max freq. = 50 Hz
As the power is switched on, the system detects the difference between the setpoint and
the actual process value and starts to either raise or decrease (in case the error value is
negative) the PID output according to the I-time. Once the difference between the setpoint
and the process value has been reduced to 0 the output is reduced by the amount
corresponding to the value of parameter 2.1.13.
In case the error value is negative, the frequency drive reacts reducing the output
correspondingly. See Figure 8-4.
Hz
D-part
PID output
Error value
D-part
D-part
P-part=5 Hz
Error=10%
Error= -10%
P-part= -5 Hz
t
NX12k69
Figure 8-4. PID output curve with the values of Example 2.
Automation and Control Solutions
Honeywell
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MIN 55422 Scarborough, Ontario 63-2600-1
MIV 4Z9
www.honeywell.com