EPC
SERVO AMPLIFIER MODULE
Part Number L723888-3xx
ELECTRONIC
Telephone: (231) 929-1660
Oilgear
Fax:
(231) 929-7879
1424 International Dr
Issued May 31, 2018
Web Site:
www.oilgear.com
Traverse City, MI USA 4 9 6 8 6
Bulletin 836260F
28
Figure 11: Advanced Control with Feed-Forward Program in Closed Loop
Example
: Figure 11 shows Program 11 Form for Advanced Control with Feed-Forward in Closed
Loop. The Command Source is Analog Input 1 (program item 501=1). The Command Preset is set
to 10% (program item 500=10) although the Command Preset is not used in this example.
The Feedback Source is Analog Input 2 (program item 502=2).
The error signal is produced by comparing the Command Source to the Feedback signal: 1.00V -
1.30V = -0.30V. The Yi and Yp signals are produced from the PI controller and the PI controller
output command is roughly equal to their sum: -2.50V + (-3.87V) = -6.37V.
The Command is offset and multiplied by the gain: (1.00V + 0.5V) x 1.5 = 2.25V. This Feed-
Forward Command is then summed with PI control output: 2.25V + (-6.37V) = -4.12V. Finally, the
Program Output is set to the Pump Controller (program item 503=0).
