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48
Verification of Control Behavior
To verify the control behavior of the pump, carefully increase the set value. The control works proper if
the swash plate angle and the pump outlet flow are also increased. If this is not the case please check
all hydraulic connections (pump inlet and outlet port) and the electrical connections to the solenoids.
Modifying Sensor Gain
The actual gain value needs to be adjusted in this way, so that the maximum output signal of the
sensor corresponds to maximum displacement. If different maximum displacements for side A and B
exist, it is only possible to adjust the sensor gain for the side with the greater maximum displacement.
To adjust the sensor gain, tilt the pump out about 80% of its maximum displacement. Display
parameters D1.10, D1.11 and D1.12 will show set value, actual value and lag error. If the set value is
equal to actual value (lag error = 0) the sensor gain is adjusted correctly.
If the actual value is greater than the set value (lag error is negative), the sensor gain is too large. In
this case scale down the sensor gain C1.10 by 0.1V steps until the lag error D1.12 is set to zero.
If the actual value is smaller than the set value (lag error is positive), the sensor gain is too small. In
this case increase the sensor gain C1.10 by 0.1V steps until the lag error D1.12 is set to zero.
Please pay attention that proper adjustment of the sensor gain is only possible for one maximum
displacement. If the pump has alternating pressure sides (A and B) with different maximum
displacements, the sensor gain is the same in both directions. In this case the maximum flow of the
smaller maximum displacement side is already reached before the maximum set value (example: Side
A: V
1Amax
= 100 % at set value 10 V, V
1Bmax
= 80 % * V
1Amax
, V
1Bmax
is reached at set value –8 V).
Closed Loop Function
After adjusting the pump and controller card test your application in closed loop function.
Saving Parameters
All parameters that have been changed during commissioning should be noted and saved. Using the
ER9.3-Tool it is possible to save the parameter set on a PC and download it in other applications.
Hint
Description of function, wiring, commissioning and parameters in this manual represent the state of
the art to use a proportional valve for displacement control (SP) with the recommended components
from EATON. The digital controller and amplifier card ER9.3-10 is capable of many more functions
than described in this manual. Therefore, it is possible to use a second controller loop. If you are
interested in using additional functions of the digital controller and amplifier card ER9.3-10 please
contact the EATON Fluid Power GmbH, Wehrheim.
