- Forum
- Roboteq Motor Controllers
- Controller Configuration & Operation
- SDC2130: Strange encoder feedback
SDC2130: Strange encoder feedback
- nabilgabbouj
- Topic Author
- Offline
Less
More
- Posts: 4
- Thank you received: 0
7 years 8 months ago #29531626
by nabilgabbouj
SDC2130: Strange encoder feedback was created by nabilgabbouj
Dear all,
I have the sdc2130 unit connected to a DC motor rated at 3000 rpm and an AMT102-V encoder configured at 2048 ppr.
In closed loop speed the motor runs smoothly, however at a certain speed (approximatly 800 rpm) the encoder feedback turns negative and decreases. And the motor goes rapidly backwards and forwards and then it stops (because of the loop error detection).
I enclosed the chart for the tests we did in open-loop.
After reading the SDC2130's datasheet I thought that the problem was the encoder pin frequency, so I changed the PPR in the encoder to 125 PPR. The problem persists. I already updated the firmware of the unit.
What should I do?
I have the sdc2130 unit connected to a DC motor rated at 3000 rpm and an AMT102-V encoder configured at 2048 ppr.
In closed loop speed the motor runs smoothly, however at a certain speed (approximatly 800 rpm) the encoder feedback turns negative and decreases. And the motor goes rapidly backwards and forwards and then it stops (because of the loop error detection).
I enclosed the chart for the tests we did in open-loop.
After reading the SDC2130's datasheet I thought that the problem was the encoder pin frequency, so I changed the PPR in the encoder to 125 PPR. The problem persists. I already updated the firmware of the unit.
What should I do?
Please Log in or Create an account to join the conversation.
7 years 8 months ago #29531632
by niko
Replied by niko on topic SDC2130: Strange encoder feedback
Hello,
Please provide us with a chart log with the following values:
Motor Command 1
Counter 1
Speed 1 RPM
Feedback 1
Loop Error 1
Please provide us with a chart log with the following values:
Motor Command 1
Counter 1
Speed 1 RPM
Feedback 1
Loop Error 1
Please Log in or Create an account to join the conversation.
- nabilgabbouj
- Topic Author
- Offline
Less
More
- Posts: 4
- Thank you received: 0
7 years 8 months ago #29531654
by nabilgabbouj
Replied by nabilgabbouj on topic SDC2130: Strange encoder feedback
Sorry for the delay,
I've attached the logs that I've done with the unit with the values requested.
Thank you in advance,
I've attached the logs that I've done with the unit with the values requested.
Thank you in advance,
Please Log in or Create an account to join the conversation.
7 years 7 months ago #29531662
by niko
Replied by niko on topic SDC2130: Strange encoder feedback
Hi,
from the data I can see that the encoder counter is missing counts. Which version of SDC do you use (check the label on the board)? What is the PPR/CPR of the encoder?
from the data I can see that the encoder counter is missing counts. Which version of SDC do you use (check the label on the board)? What is the PPR/CPR of the encoder?
Please Log in or Create an account to join the conversation.
- nabilgabbouj
- Topic Author
- Offline
Less
More
- Posts: 4
- Thank you received: 0
7 years 7 months ago #29531664
by nabilgabbouj
Replied by nabilgabbouj on topic SDC2130: Strange encoder feedback
I am using the SDC2130 with 2048 PPR encoder.
Please Log in or Create an account to join the conversation.
7 years 7 months ago #29531665
by niko
Replied by niko on topic SDC2130: Strange encoder feedback
Please type ?uid and send me the result.
Please Log in or Create an account to join the conversation.
- nabilgabbouj
- Topic Author
- Offline
Less
More
- Posts: 4
- Thank you received: 0
7 years 7 months ago #29531666
by nabilgabbouj
Replied by nabilgabbouj on topic SDC2130: Strange encoder feedback
?uid
UID=100:1042:108134224:1381336679:1730167605
UID=100:1042:108134224:1381336679:1730167605
Please Log in or Create an account to join the conversation.
7 years 7 months ago #29531670
by niko
Replied by niko on topic SDC2130: Strange encoder feedback
Hello,
Well since you have the SDC2130 v1.4 there is a limitation in encoder frequency. According to datashhet the maximum frequency is 30000 Counts/sec. This is due to the fact that the encoder is a sof encoder. If you use only 1 motor channel you can install the SDC2130S firmware. In that case the encoder is a hard encoder and the max frequency is 1M Counts/sec.
Well since you have the SDC2130 v1.4 there is a limitation in encoder frequency. According to datashhet the maximum frequency is 30000 Counts/sec. This is due to the fact that the encoder is a sof encoder. If you use only 1 motor channel you can install the SDC2130S firmware. In that case the encoder is a hard encoder and the max frequency is 1M Counts/sec.
Please Log in or Create an account to join the conversation.
Moderators: tonysantoni
- Forum
- Roboteq Motor Controllers
- Controller Configuration & Operation
- SDC2130: Strange encoder feedback
Time to create page: 0.072 seconds