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
25
Figure 10: Pressure Control with Flow Preset Program in Flow Mode
Example
: Figure 10 shows Program 9 Form for Pressure Control with Flow Preset in the Flow
Mode. The Flow Command Source is Analog Input 1 (program item 482=1). The Flow Command
Preset is set to 10% (program item 480=10) although the Flow Command Preset is not used in this
example.
The Q to P Control Switch Source is Limit Offset (program item 489=6). The Q to P Control
Switch Preset is set to 10% (program item 488=10), therefore the Q to P Toggle Point is 5.00V -
1.00V = 4.00V.
The error signal is produced by comparing the Pressure Command Source to the Feedback signal:
5.00V - 3.40V = 1.60V. The Yi and Yp signals are produced from the PI controller and the
Pressure Command is roughly equal to their sum: 0.00V + 6.33V = 6.33V.
Since the Pressure Feedback (3.40V) is less than the Q to P Control Switch (4.00V), the program is in
Flow Control. The Flow Command (9.00V) is simply passed through to the Program Output. Finally,
the Program Output is set to the Pump Controller (program item 425=0).
