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PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

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sesa211440_brid
Lieutenant sesa211440_brid Lieutenant
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‎2018-02-20 05:57 AM
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‎2018-02-20 05:57 AM

PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

Good Evening,

I'm writing in to report a pretty strange observation that one of our customers encountered when using the PM8000 and the on-board web server GUI to view the capture voltage and current waveform. To set the basis of discussion, I am in Singapore, our power grid is 400Vac (Line-Line), 230Vac (Line-Neutral), 50Hz and grounding system is TN-S. The meter I am using to replicate the error is connected single phase, and hence only adheres to 230Vac (Line-Neutral), 50Hz and grounding system is TN-S.

The ION Setup version used is,

This is not the latest version which is build 18019 as that build crashes upon attempting to retrieve waveform from the PM8000.

The steps to recreate the problem observed on site is as follows,

1) Firmware update the PM8000 to the latest 1.4.1 firmware and using the 8000_v1.4.0_FAC-PQ_1.4.0.0.0.dcf

2) Set the meter to the following using ION Setup

3) Set the power quality settings to capture 256 samples/cycle for 7 cycles

4) Do a manual waveform capture trigger

Viewing on ION Setup, the waveforms captured on the PM8000 V1 and I1 inputs are as follows,

Nothing out of the norm. The timescale per cycle is exactly 0.020s which is 20ms, corresponding to 50Hz

But now if you view the same waveform (remember, you have flashed the new firmware, everything is erased), this is what you see,

Almost immediately you will realize the time indicated at the lowest point on the first cycle is not as indicated by ION Setup 9:08:18.821 PM but rather 13:08:18:81234 (not quite sure how you get below 1ms accuracy when our timestamp is only accurate down to 1ms). I noted that the web GUI gave the timing in UTC, hence correcting for GMT offset of +8, that gave 9:08:18.81234 PM

To matters worse, looking at the lowest point on the next cycle (that gives 1 full cycle, lowest point to lowest point)

The time indicated on the occurrence is 13:08:18.81806 UTC (9:08:18.81806 PM) where it is indicated in ION Setup as 9:08:18.841 PM

Taking the difference between the 2 adjacent lowest points on the waveform obtained from the web GUI, the total time elapsed is (9:08:18.81806 - 9:08:18:81234) = 0.00572s = 5.72ms. Since when has the frequency changed from 50Hz to well over 170Hz?

I repeated steps (1) to (4) with the exception that I modified step (3) to capture 32 samples/cycle for 54 cycles,

The capture was indicated as started at 13:29:58.07553 and the end time is indicated as 13:29:58.11548, that gives 0.03995s = 39.95ms and 54 cycles elapsed? That gives over 1350Hz in the voltage waveform.

Credit for the above goes to Shanelle Chan who was corresponding with the customer and detected this error in the web GUI. Without her persistence, I doubt this error would have been surfaced. In summary, the errors found as below,

- Web GUI reports timing in UTC while the device is set to 12 hour clock

- Time reported by ION Setup difference significantly from that reported on the web GUI waveform viewer

- Waveform timescale on the web waveform viewer is not correct

- Timescale error changes from bad to worse when more cycles of waveform is captured

Appreciate the engineering / development teams look into this matter with urgency as it is impacting the credibility of our products.

Best Regards,

Tan Kuan Khoon

Senior Specialist, PAE

EcoBuilding

Schneider Electric Singapore

Junhui Shanelle CHAN​ Chia Yoong ONG​ Yeh Wei LOH​

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  • Tags:
  • pm8000
  • waveform
  • waveform analysis
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ChenLiang
ChenLiang Schneider Alumni (Retired)
Schneider Alumni (Retired)
‎2018-04-19 03:38 PM
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‎2018-04-19 03:38 PM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

To close this topic, it turns out a waveform viewer bug, and could be fixed by replacing the ‘/web/resources/js/waveFormViewer.js‘ file. More details could be find in bfo case 46488333.

See Answer In Context

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Fabricio
Fabricio Schneider Alumni (Retired)
Schneider Alumni (Retired)
‎2018-02-21 09:19 AM
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‎2018-02-21 09:19 AM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

Hi Tan Kuan Khoon,

Have you opened a technical support case for this issue? I would like to have somebody looking into it from our expert team.

Thanks for bringing this to our attention.

Regards,

Fabricio

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Robert_Lee
Captain Robert_Lee Captain
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‎2018-02-21 09:34 AM
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‎2018-02-21 09:34 AM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

The issue with the ION Setup waveform viewer is an issue with the IONTKN.DLL which is not properly decoding the ION timestamp with a high enough resolution.  The latest version of ION Setup now has a temporary fix to address this until we can figure out if we can easily fix the DLL in the future or some other means to address this issue.

To fix the crash issue, I have =S= only version as I'm still running some verification test on some fixes for this version:

https://schneider-electric.box.com/IONSetupDebug

As for the web viewer discrepancies, the Web GUI I believe uses the ComTrade files on the device and at the moment does not adjust for the programmed time zone.  There may be other issues as well but I will let someone with more knowledge of those comment on that.

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EduardoFainblum
Commander EduardoFainblum Commander
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‎2018-02-21 01:54 PM
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‎2018-02-21 01:54 PM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

Hi Kuan Khoon TAN​


I have logged this issue for further investigation  with PME.

Thanks for reporting it.

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ChenLiang
ChenLiang Schneider Alumni (Retired)
Schneider Alumni (Retired)
‎2018-02-21 02:28 PM
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‎2018-02-21 02:28 PM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

Hi Tan Kuan Khoon,

I have created one case in BFO, case number is 46488333.

I will investigate it and contact you through the bfo system.

Thanks

Leo

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sesa211440_brid
Lieutenant sesa211440_brid Lieutenant
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‎2018-02-22 02:09 AM
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‎2018-02-22 02:09 AM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

Hi All,

Thanks for the follow up on this. Looking forward to getting some concrete replies from our engineering departments.

Best Regards,

KK

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sesa211440_brid
Lieutenant sesa211440_brid Lieutenant
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‎2018-02-28 02:46 AM
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‎2018-02-28 02:46 AM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

Hi Leo,

The Comtrade files as requested. Thanks.

KK

Attachments
cmt0__00000.cfg.zip
cmt0__00000.dat.zip
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ChenLiang
ChenLiang Schneider Alumni (Retired)
Schneider Alumni (Retired)
‎2018-04-19 03:38 PM
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‎2018-04-19 03:38 PM

Re: PM8000 (F/W 1.4.1) - Web GUI Waveform Display Timescale Error

To close this topic, it turns out a waveform viewer bug, and could be fixed by replacing the ‘/web/resources/js/waveFormViewer.js‘ file. More details could be find in bfo case 46488333.

See Answer In Context

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Reply
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