The document provides a guide to identify and resolve the issue of piezoelectric products not functioning in closed loop due to zero offset. It details steps for identifying the problem using the Coremorrow E01.D6 controller and VS12 actuators, followed by a solution involving adjustment of the zero potentiometer. Finally, it includes a verification process to ensure the adjustments are effective, allowing normal closed loop operation.

1. How to Identify and Solve the Problem That Piezoelectric
Products Unable to Achieve Close Loop Due to Zero Offset
Harbin Core Tomorrow Science & Technology Co., Ltd.

2. Hello everyone, today professional CoreMorrow engineer will introduce
the identification and solutions for piezoelectric products that cannot
be used in closed loop due to zero offset.

3. The first step: The identification method of the piezoelectric product
unable to close the loop due to the zero offset

4. We take CoreMorrow E01.D6 piezoelectric controller and CoreMorrow
VS12 series piezoelectric ceramic actuators as examples to introduce.
The adjustment methods of other products are similar.

5. Firstly, correctly connect the drive and sensing lines of the piezoelectric
ceramic actuator to the corresponding PZT and SENSOR interfaces on
the E01.D6 piezoelectric controller panel.

6. Secondly, connect the sensor monitor SENSOR MONITOR output port
on the piezoelectric controller with the multimeter through the sensor
monitor output line.

7. Thirdly, adjust the open/closed loop Servo state of all output channels
of the piezoelectric controller to the open loop state (that is, turn it
OFF).

8. After the above operations are performed, turn on the piezoelectric
controller (the power switch of E01.D6 is on the rear panel).

9. Adjust the multimeter to the DC voltage range.

10. Under normal conditions, the voltage displayed on the multimeter is in
the range of 0~0.4V, and at this time, it can be seen that the voltage
value displayed by the multimeter has far exceeded the normal output
voltage range. This shows that the zero point has been greatly biased,
causing the piezoelectric products to be unable to operate in a closed
loop.

11. The second step: The solution to the piezoelectric product unable to
close the loop caused by the zero offset
Now Let’s talk about how to solve this problem.

12. Firstly, find the position of the ZERO potentiometer on the panel of the
piezoelectric controller.

13. Then prepare a flat-blade screwdriver, and adjust the ZERO
potentiometer with a flat-blade screwdriver.

14. At the same time, pay attention to the voltage value change on the
multimeter. The counterclockwise adjustment will make the monitor
output voltage smaller, and the clockwise adjustment will make the
monitor output voltage larger. Adjust to the output voltage value on
the multimeter within the range of 0~0.4V to stop.

15. Then, set the piezoelectric controller to output the maximum voltage
value. After the setting is complete, set the output voltage to 0V, and
observe the voltage value change on the multimeter at this time.

16. If it is not within the range of 0~0.4V, you still need to adjust the
potentiometer and adjust the voltage displayed on the multimeter to
within the range of 0~0.4V.

17. After adjustment, repeat the above operations: set the maximum
output voltage and set the output voltage of 0V until the voltage
displayed on the multimeter is within the range of 0~0.4V after the
operation, then the adjustment operation is completed.

18. The third step: Verification of validity after zero offset adjustment
operation.
After making the above adjustments, let's verify whether the
adjustments are effective.

19. Adjust the open/closed loop Servo state of the corresponding output
channel to the closed loop state (that is, turn it ON).

20. Set the maximum displacement value of the output piezoelectric
ceramic actuator. At this time, we can observe that the voltage range
displayed on the multimeter is about 10V;

21. Then set the output zero displacement and observe the voltage
displayed on the multimeter. If it is around 0V, it proves that the zero
offset problem has been solved, and the piezoelectric product can be
used in a normal closed loop.

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