adccommunitymod (AutomationDirect) asked a question.
looking for help with C0-04RTD and Pt100
Created Date: May 02,2017
Created By: cvn80
**** This post has been imported from our legacy forum. Information in this post may be outdated and links contained in the post may no longer work.****
I connect 3 Pt100s to C0-04RTD, when VFD drive is running, all 3 channels can't get right temperature (very low values). But If only one Pt100 is connected, temp value is good. How can I solve this? Thank you so much. Alan
Created Date: May 02,2017
Created by: cvn80
I connect 3 Pt100s to C0-04RTD, when VFD drive is running, all 3 channels can't get right temperature (very low values). But If only one Pt100 is connected, temp value is good.
How can I solve this? Thank you so much. Alan
Created Date: May 02,2017
Created by: Ridgeline Mach
Noise from VFD or there's a grounding issue.
Created Date: May 02,2017
Created by: cvn80
Hi, Thank you!
I ground the VFD, Click PLC and Pt100 shield cables. The temp value reading is much better, but still around 20 degree lower than the actual temperature. Could I do anything else to improve the reading temp?
Created Date: May 02,2017
Created by: Ridgeline Mach
I would use a shielded cable for the output power run from the drive to the motor. Something like McMaster-Carr part number 9700T46. When using a regular cable without shield, there may still be enough noise to effect your RTD's.
OR you could try changing the carrier frequency the drive produces. on GS drives that's parameter 2.08. lowing that value may increase RTD accuracy. Just know that lowering the carrier frequency will make the motor have a discernible high pitched whine. If this application is near operators, that noise may be a nuisance.
Created Date: May 08,2017
Created by: cvn80
I would use a shielded cable for the output power run from the drive to the motor. Something like McMaster-Carr part number 9700T46. When using a regular cable without shield, there may still be enough noise to effect your RTD's.
OR you could try changing the carrier frequency the drive produces. on GS drives that's parameter 2.08. lowing that value may increase RTD accuracy. Just know that lowering the carrier frequency will make the motor have a discernible high pitched whine. If this application is near operators, that noise may be a nuisance.
Thank you so much!
Created Date: May 08,2017
Created by: cvn80
I connect 3 Pt100s to C0-04RTD, when VFD drive is running, all 3 channels can't get right temperature (very low values). But If only one Pt100 is connected, temp value is good.
How can I solve this? Thank you so much. Alan
Today I update the firmware of CLICK PLC to 2.10, the problem is solved! Connected 4 Pt100s to C0-04RTD, all of them can get right values.
Created Date: May 09,2017
Created by: kewakl
Today I update the firmware of CLICK PLC to 2.10, the problem is solved! Connected 4 Pt100s to C0-04RTD, all of them can get right values.
Hmmm. another AD software product notification that has not (and likely WILL NOT) arrive. I have subscribed several times.
Thanks cvn80 for the heads up on the 2.10.
RETENTIVE TEXT!!