PI P-841.1, User Manual, Page: 25 / 34

9 Troubleshooting
No or limited motion
Cable not connected correctly ►
Check the cable connections.
Excessive load ►
Do not exceed the maximum push/pull capacity
according to the specifications (p. 28) .
Zero shifting of the position sensor for the
following reasons:
Load in direction of motion
Surrounding/operating temperature of the
piezo actuator is much higher or lower than
the calibration temperature (21 °C to 24 °C) ►
Readjust the sensor's zero-point (see manual for
the electronics).
Piezo actuator is depolarized due to over-
heating ►
Contact our customer service depart-
ment (p. 27) .
Defective actuator ►
If possible, replace the defective actuator with
another actuator and test the new combination.
Reduced accuracy
The electronics or mechanics were replaced ►
Recalibrate the axis displacement (see controller
manual) or contact our customer service depart-
ment (p. 27) .
Axes were mixed up during connection ►
In the case of calibrated systems, pay attention
to the assignment of the axes when connecting
several piezo actuators to a multi-channel con-
troller. This assignment is indicated by labels on
the devices.
The piezo actuator starts oscillating or positions inaccurately
Servo control parameters set incorrectly be-
cause for example, the load was changed ►
Switch off the servo mode of the corresponding
axes immediately.
►
Check the servo control parameter settings on
the controller.
►
Adjust the servo control parameters on the con-
troller according to the load change.
Operating with an excessively high frequen-
cy ►
Operate the piezo actuator at a maximum of one
third of the resonant frequency (see "Data Ta-
ble" (p. 28) for resonant frequency of the un-
loaded piezo actuator, see "Calculating the Maxi-
mum Operating Frequency of the Loaded Piezo
Actuator" (p. 19) for resonant frequency of the
loaded piezo actuator).
9 TROUBLESHOOTING P841M0001EN
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1/29/2021
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