System 450™ Series Modular Control Systems with Standard Control Modules Technical Bulletin
60
Note:
In many applications, the response time away from the original control
point to the shifted control point is different from the response time of
the shifted control point back to the original control point, depending
on a variety of factors such as system load and system output. Choose
the slower of the two measured response times to determine the I-C
setting for your application.
7. Use the slower of the two measured response times and the following table to
determine which integration constant (I-C setting) to set on the control and test
first.
8. Set the integration constant to the determined I-C setting. Operate and observe
the controlled system at a variety of load conditions to determine if the system
is stable at the determined I-C setting over the entire output range of the
controlled system.
Table 8: Response Times, Reset Rates, and Integration Constants
Slowest Measured
Response Time for
Control Point Shift
Select This Integration
Constant (I-C) Value for
the Analog Output
Estimated Total Reset Rate
for Integration Constant
N/A
0
No reset rate
10 to 15 minutes
1
1 hour (3,600 seconds)
6 to 10 minutes
2
30 minutes (1,800 seconds)
3 to 6 minutes
3
15 minutes (900 seconds)
1 to 3 minutes
4
5 minutes (300 seconds)
30 to 60 seconds
5
2 minutes (120 seconds)
10 to 30 seconds
6
1 minute (60 seconds)
