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

[sanjeev4_kumar_]

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.

[Bojan]

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]

Sanjeev - is this resolved?

Thanks

Tom

[DanL]

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?