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
44
4.4.5.2 Adjustment Algorithm
The following algorithm may be used to optimally configure the unit. The PC Interface
includes a Microsoft Excel ™ template (EPCConfig.xlt) that can be used to optimize the
setup. The Excel template is also available through e-mail by request to
1. Place the module in Adjustment mode (refer to Section 4.6.1.1).
2. Use an Initial setting of Offset = 512, Course Gain = 0, and Fine Gain = 0.
3. Toggle the Pump Command and note the LVDT readings at the maximum positive and
negative toggle commands (refer to Section 4.4.4.3 regarding toggle command).
4. Determine the midpoint of these two LVDT readings and compare with the desired
midpoint reading (see previous Section).
5. Adjust the LVDT offset so that the two LVDT readings have the desired midpoint
reading.
6. Adjust the LVDT course gain upwards from the initial setting such that the positive
and negative toggle commands produce LVDT signals as large as possible without
either toggle command producing an LVDT signal out of the LVDT configuration
range..
7. Repeat steps 3 through 6 until a one-digit course gain change is unable to produce
LVDT signals within the configuration range. For a uni-directional pump, a positive
toggle command should produce an LVDT signal slightly less than +10VDC and a
negative toggle command should produce an LVDT signal slightly greater than
0VDC. For a bi-directional pump, a positive toggle command should produce an
LVDT signal slightly less than +10VDC and a negative toggle command should
produce an LVDT signal slightly greater than -10VDC.
8. Once the Course gain is found, adjust the fine gain upward from the initial setup.
Do
not adjust the course gain and fine gain concurrently since the two do not
function together in a straightforward linear fashion
.
9. Determine the midpoint of these two LVDT readings and compare with the desired
midpoint reading (see previous Section).
10. Adjust the LVDT offset so that the two LVDT readings have the desired midpoint
reading.
11. Adjust the LVDT fine gain downward from the initial setting until one of the two pump
toggle commands is just under the pump range.
12. Repeat steps 9 through 11 until a one digit fine gain change produces LVDT signals
spanning the entire configuration range. For a uni-directional pump, a positive toggle
command should produce an LVDT signal of +10VDC and a negative toggle command
should produce an LVDT signal of 0VDC. For a bi-directional pump, a positive toggle
command should produce an LVDT signal of +10VDC and a negative toggle command
should produce an LVDT signal of -10VDC.
