J
Hello,
Here we have a turbo-generator with 3 AI-TEK's passive magnetic sensors (2oo3 voting) to over-speed trip function.
There are two logic solvers (relay panel with AI-TEK's tachometers + Invensys Tricon) sharing the 3 sensors in a parallel connection with the same instrument grounding.
Now we are facing a strange behavior for the measures from sensor A. Until 3500 rpm they are equal to others sensors, them they are multiplied by two.
DC impedance is OK. Bad insulation isn't a issue. Wave forms and frequency from a scope meter are normal.
Thanks for any help.
Here we have a turbo-generator with 3 AI-TEK's passive magnetic sensors (2oo3 voting) to over-speed trip function.
There are two logic solvers (relay panel with AI-TEK's tachometers + Invensys Tricon) sharing the 3 sensors in a parallel connection with the same instrument grounding.
Now we are facing a strange behavior for the measures from sensor A. Until 3500 rpm they are equal to others sensors, them they are multiplied by two.
DC impedance is OK. Bad insulation isn't a issue. Wave forms and frequency from a scope meter are normal.
Thanks for any help.