MH860 series hydraulic servo drive
Commissioning
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After the successful test of low pressure retaining, you can perform the test of high pressure
retaining. Set the flow reference to 80% on the upper computer, and gradually increase the
pressure reference to max. pressure required. View d09 (Pressure feedback) and d07 (Speed
feedback).
If the actual system pressure cannot reach the set pressure, check the oil path for leakage.
If the actual system pressure reaches the set pressure, but the motor average rotation speed
is higher than the normal one, check whether:
There is abnormal leakage in the oil pump.
There is abnormal leakage in the hydraulic oil path.
There is leakage in the relief valve.
Ensure the retained pressure and motor rotation speed at retaining meet requirements, and
ensure the pressure fluctuation meets requirements according to the following table.
Measuring indicator
Expected result (recommended)
Pressure fluctuation (100% of pressure reference)
≤3bar
6.2.8 Calibration review
In the pressure retaining test, set the pressure reference to 10bar, 100bar, and full scale
pressure on the upper computer. Check whether the read data in the pressure table matches
the setting. If not, perform pressure calibration again.
Set the flow reference to 5%, 50%, and 100% on the upper computer. Check whether the
motor rotation speed and given flow are in a proportion. If not, perform flow calibration again.
6.2.9 Fully automatic run and system performance adjustment
1.
Set multi-step speed/pressure PI.
If the servo system uses stepped PI control in different working conditions, connect the digital
input ports I3 (CN3-9) and I4 (CN3-10) as the indication signals of control stages, and then
enable multi-step PI of speed/pressure. The following table lists the mapping between digital
input signals and speed/pressure PI steps.
I4
I3
KP No.
KI No.
low
low
0
0
low
high
1
1
high
low
2
2
high
high
3
3
2.
Adjust system performance.
The servo system uses the following gain parameters for oil pressure control. You can adjust
the response characteristics and steady-state accuracy of the servo system by setting these
parameters.
Speed PI adjustment:
Code
Definition
Setting
Range
Default
F139
Enabling multi-step PI of
speed
0: Disable
1: Enable
0
