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.
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.
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?
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