Powerflex 400 question.

[TF and the wire]

I have a Powerflex 400 inverter driving a fan motor. It was installed to run at 45Hz (50Hz motor) and I have been asked to lower it to 40Hz by my boss, (he's a fiddler).

The speed reference parameter is set to internal frequency so that it should run at whatever frequency is in parameter A142. I tried changing this value from 45 to 40. The programming LED even lit but after I have entered the value and run the motor, it still runs to 45Hz.

I've had a look in the manual and found a parameter A198, which is used to lock the parameters to all except those who have the password. I haven't had chance to check this setting yet but I would have thought that if there was a lock in there, the programming LED wouldn't have come on.

Any idea as to why it won't change.

 

[bugsy]

The LED acknoledges the programme input command but it wont overide the existing command which is password protected

 

[Tester Steve]

Nice pdf manual here. HTH.

Steve.

 

[TF and the wire]

I managed to adjust the speed by simply using the up and down keys on the front keypad. I can't understand why, as the parameter PO38 is set to "1" which should mean that the speed is determined by the value in A164, which I tried altering with no success.

At least I can do what I want to, I just like to know out of curiosity.