Technical FAQs

Ask a Question

What would cause an 8804 Omegapak drive to not follow the commanded speed reference?

Check the drive works as intended in the hand mode. This verifies the bulk of the main control board`s logic, operation, and wiring.

To test the hand operation:

1 - If required, isolated the motor as the drive will be run at a variety of speeds, possible over 60 Hz.

2 - Put the door mounted selector switch (H-O-A or H-A) in the hand mode.

3 - Make all main control board measurements with reference to its terminal TB1-6 (common).

4 - With the drive running,
- Set the Manual Speed potentiometer to minimum.
- Measure to TB1-1.
- Adjust the Hand Minimum Reference potentiometer (P8 - HMR) from minimum to maximum setting.
- The voltage at TB1-1 should vary from 0 to -5 (negative) vdc. If not, change the main control board as there is probably a problem with the P8.

5 - With the drive running,
- Repeat the following measurements with the Manual Speed potentiometer at 0%, 25%, 50%, 75% and 100% settings.
- At each of the speed points, measure to TB1-2. This voltage will change from 0 to -10 (negative) vdc which corresponds to a command for 0% to 100% speed. The voltages should be linear through the range. If not, change / check the Manual Speed potentiometer as there is probably a problem with it.

6 - With the drive running,
- Repeat the following measurements with the Manual Speed potentiometer at 0%, 25%, 50%, 75% and 100% settings.
- At each of the speed points, measure to TB1-4. This will vary from 0 to 5 vdc which corresponds to an output frequency of 0 to 120 Hz. There may be a delays in this value stabilizing as the drive must complete its ramp. This voltage should be linear through the range so 2.5 vdc is equal to 60 Hz operation. These voltages should be proportional to the voltages taken in step 5. If not, change the main control board as there is probably a problem with its firing circuit.

7 - With the drive running,
- Set the Manual Speed potentiometer to maximum.
- Measure to TB1-4.
- Adjust the Maximum Speed potentiometer (P14 - MSD) from minimum to maximum setting.
- The voltage at TB1-4 will vary from linearly; 2.5 vdc is equal to 60 Hz. If not, change the main control board as there is probably a problem with it.

If all of this is verified to work properly, suspect a problem in the automatic mode. This may be a installation, wiring, or adjustment error or there may be a problem with the option board. Don`t forget to
return all user settings (max & min) to their desired original values.



CTA-ID : 2003101
Was this helpful?
What can we do to improve the information ?