Hi,
I recently encountered a problem with my jrk 21v3. the output voltage is not enough. I checked it with multimeter it is around 0.2 V. It was working fine before by outputting 5 V. The motor barely moves.
Please let me know what are the possible causes?
Regards,
Farhad
Hi, Farhad.
Could you please let us know a bit more about your setup? How are you supplying power to your system? Could you measure its output to be sure it is still good? What are you commanding the motor to do when you check the voltage? Could you please post your jrk settings file?
-Derrill
How are you supplying power to your system? power supply.
Could you measure its output to be sure it is still good? It seems that it just got locked on 0.2 V. It was working just fine earlier. We bought encoder and introduce sin waves to system and motor was doing sin waves in high accuracy, but now, it can’t even provide constant 5 V…
What are you commanding the motor to do when you check the voltage? Pushing the “run motor” bottom. the feedback is off…
Could you please post your jrk settings file? Ok. i did.
Thanks,
Farhad
jrk-setting file.txt (1.38 KB)
Let me give more detailed responses.
System is supplied by power supply with 5V. the same configuration that was working before. Max current input is set at 800 MA which is motor’s Stall current @ 4.5V.
I suspect something shortened out on a circuit, but i don’t know which part burnt out.
It was working properly for several months. If we could find the possible cause of this issue we can probably avoid it in future.
Thank you,
Hi, Farhad.
From the settings file, it looks like the Current Max setting on the Motor tab was set extremely low at 0.037A. The jrk’s current limiting feature adjusts the effective voltage supplied at the motor outputs. So, if this current is a low value, the output voltage will also be low. Could you try increasing the Current Max value to see if that works?
-Derrill
Hi Derril,
I did increase the MAX current. There is no change.
What do you recommend to do? I guess we need to buy another Jrk?
Thanks,
Farhad
Hi, Farhad.
What did you increase the setting to? I suggest setting Current Max to 0.0 (the default for no current limiting).
-Derrill
Hi, Farhad.
If that doesn’t work, you should try just resetting your settings to factory defaults and checking to see if you can get a motor moving (without feedback) from the jrk configuration utility. While the board might be damaged, it seems like you might also just have some weird settings. To reset the settings, select the “Reset to default settings…” option from the File menu.
- Ben
Hi Ben,
I did reset the jrk settings. There was no change so i was convinced that Jrk was damaged. We got new Jrks, but I am experiencing the same issue.
The motor is rotating very slowly, and jrk’s red LED goes on and off. start/stop bottoms on “jrk configuration utility” also goes on and off very quickly.
More current is also needed from power supply. I am assuming the motor is half burnt out?
Motor seems fine when i directly connect it to power supply…
Please let me know if you have any suggestions,
Thanks,
Farhad
If you disconnect the motor from the jrk and just look at the jrk’s motor outputs with a multimeter when commanding it to move at full speed from the configuration utility, do you see the full supply voltage?
- Ben
Hi Ben,
I did what you said. Jrk’s output is 5 V without motor, but it drops to 0.002V when i attach the motor.
It said that probably motor is partially burnt out.
What do you think?
Thanks,
Farhad
It could be a problem with your motor, but the more likely culprit is your power supply. Can you try with a more powerful (and, ideally, higher-voltage) supply and see if the problem goes away. If the motor runs fine when connected directly to the power supply, then the motor is probably okay, but this is not enough to conclude that the power supply is appropriate for that motor.
- Ben
Hi Ben,
This is the link for our power supply: alliedelec.com/search/produc … 4AodKDAAxg
Do you have any recommendation as far as appropriate power supply?
The motor is not going as fast as it supposed to rotate at 5V when is directly connected to power supply.
Thanks for your helps,
Farhad
Can you try raising the voltage of your supply to something like 7 or 8 V? Can you try it with a battery pack?
- Ben
