Powerflex 700S2 / 2 encoder problem

Bitpopler

Member
Join Date
May 2008
Location
Recklinghausen
Posts
9
hi everybody,

I have a small problem with a powerflex 700 S2 Drive in conjunction with 2 encoders (2nd encoder option card is mounted).

encoder 0 is mounted on the shaft of a conveyor
encoder 1 is mounted on the main motor of a machine.

The goal is to run the conveyor with exactly the same speed as the main motor of the machne.

I had everything mounted in my office for testing and all worked fine (autotune etc.). I tested the system with a drilling machine (encoder 1) and encoder 0 mounted directly to the test drives shaft. as already said, all worked excellent.

Now i am on site and have a problem.

encoder 0 is now mounted on the shaft of the conveyor (not the motor) with a gearbox between.

Autotune now fails because the speed feedback is not correct (this is true, it is of by the gearbox ration (ca. 5.2 Factor)).

I cannot find any way to tell the powerflex 700 Drive to multiply the encoder signals with about 5.2.

encoder 0 is configured as Speed Feedback Signal Primary
encoder 1 Speed Signal is linked to Parameter 10 (Speed Signal).

Is there any way to fix this ?

thank you in advance

greets
 
You must have to tell the drive what the Pulse Per Revolution rate is for each encoder somewhere in the parameters. On the encoder with the gearbox, multiply the actual PPR times the gearbox ratio and enter that for the encoder PPR.
 
hi,

no, that is too easy :). The Powerflex only allows me to enter predefined ppr values. These valid settings are written in the manual. I tried it anyway and it does not work, the drive does not start anymore with these settings.

greets
 
As a temporary fix, you may be able to configure the drive for sensorless vector mode so that it does not need encoder 0 as a speed feedback signal.

This may affect the performance too much for you application but is worth a try.

I don't have the PF700 manuals available so I can't be specific how to do this.

Paul
 

Similar Topics

New to vfds. I put in parameters. IP, but I get ethernet flashing and link solid. What did I do wrong?
Replies
1
Views
27
Are the N files in the 525 the same as the 40p for ethernet? (E-Comm card) I have used 40P with Micrologix 1400 Messaging but don't see the N...
Replies
1
Views
70
How to remove faceplate from power flex 753 and not shutting the system down. What parameters should i change?
Replies
1
Views
78
Hey all, I am currently working on a depalletizer for a customer and we are doing a hoist upgrade. This is a SLC500 processor and the drives are...
Replies
6
Views
190
Powerflex 755, running 2 weeks, and faulting with code 17 input phase loss.
Replies
3
Views
157
Back
Top Bottom