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Analog output channel 1&2 0-20mA ports giving 36mA

Metering & Power Quality

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sanjeev4_kumar_
Crewman Crewman
Crewman
0 Likes
3
182

Analog output channel 1&2 0-20mA ports giving 36mA

It was observed that ION 7550 MD controller to Power Logic (Schneider)  SCADA values were freeze,We have reset the power supply of the meter after that analog output channel 1&2 0-20mA ports giving 36mA and this will effecting the our load shedding program.

Please advice for the solution and reason why we are getting analog output as 36 ma.

3 Replies 3
Bojan
Captain Captain
Captain
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0
157

Re: Analog output channel 1&2 0-20mA ports giving 36mA

Hi Sanjeev,

I had a similar problem with PM8000 meter optional Input / Output card (“I/O card”) which supposed to be a bad contact issue:

I would suggest you to re-install the optional Input/Output card (“I/O card”) by following the Installing the I/O Card steps from ION7550 / ION7650 I/O Card document.

Best Regards,

Bojan

Tom_Stevenson
Picard Picard
Picard
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0
157

Re: Analog output channel 1&2 0-20mA ports giving 36mA

Sanjeev - is this resolved?

Thanks


Tom

DanL
Commander Commander
Commander
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0
157

Re: Analog output channel 1&2 0-20mA ports giving 36mA

I'm interested in learning more about both cases (since they have completely different designs):

1. What device or devices are in the analog loop?

          what are the differential and common mode load impedances

          what is the differential voltage at the analog output terminals of the =S= device

          what is the voltage to earth at each of the analog output terminals of the =S= device

2. how was the 36mA DC measured? IE. value from =S= output device, clamp on DC meter, voltmeter across series load resistor, etc

3. Does powercycling the meters resolve the issue?

4. Does disconnect + reconnect the analog loop resolve the issue?