23-04-2012, 09:45 PM
Joe: two points:
1. Motor-boating is a symptom of low-frequency instability. Defective decoupling ccts. are the usual causes (electrolytics having had a major loss of capacitance) , but it seems that you've eliminated that possibility.
2. I'm a bit puzzled about the current set of fault conditions that you have reported. You've established that the batteries are in a good condition, yet you say that the set won't run off these batteries - but presumably will run from an external PSU. Sounds to me as though there is something adrift, connection-wise, between those batts. and where they deliver their volts to the set. And that's a bit puzzling . .
Just update me, please, on what the exact fault conditions are and what your current test set-up is: I'm getting a bit confused.
Thank you.
Al.
1. Motor-boating is a symptom of low-frequency instability. Defective decoupling ccts. are the usual causes (electrolytics having had a major loss of capacitance) , but it seems that you've eliminated that possibility.
2. I'm a bit puzzled about the current set of fault conditions that you have reported. You've established that the batteries are in a good condition, yet you say that the set won't run off these batteries - but presumably will run from an external PSU. Sounds to me as though there is something adrift, connection-wise, between those batts. and where they deliver their volts to the set. And that's a bit puzzling . .
Just update me, please, on what the exact fault conditions are and what your current test set-up is: I'm getting a bit confused.
Thank you.
Al.
