power flex 4 parameters

Hello, I have a drive that when the 10 turn pot is turned down all the way the motor still runs at 17 hertz min freq is set to 0 is there an input offset parameter??. the pot also reads 0 when turned all the way down ?any ideas

The VFD's I've dealt with require a 3 wire set-up for the external pot, the analog input has to be "voltage". 0-10v is most common unless it is a forward/reverse application. The VFD has an on-board 10v power supply.

If you don't have the owner's manual, download it from the mfg's website.
Check the wiring against the owners manual.
See if you can change the "reference source" to "local" (onboard keypad for example) temporarily and observe your ability to control the frequency with the alternate reference source.
Check the "option" setting for the "type" of analog signal associated with the pot. Should most likely be 0-10v.
Try running it WITHOUT the pot connected.
Check the "actual" voltage of the on-board power supply.
Find out if this is a "new" problem, or has it "always been thus".
Some VFD's DO have an "offset" associated with the analog input signal.

Stationmaster

Check parameter A110 it should be "0" otherwise make it zero

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/22a-um001_-en-e.pdf

Check out page 68 pertaining to parameter A110 [Anlg In 0-10V Lo]

Sets the analog input level that corresponds to P034 [Minimum Freq] if a 0-10V input is used by P038
[Speed Reference].

Click to expand...

Before lowering the minimum speed at which your motor runs, determine if the motor or the load may "require" at least 17hz (as set up by some previous tech)to cool properly, lift water in a pump to a minimum level, etc.

Stationmaster