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User name Jack (Techs)
Log entry time 18:22:56 on November 18, 2009
Entry number 300840
Followups:
keyword=Left Q1
While undoing a strap holding some polyethylene to the supply I heard a
loud "pop", and the magnet had dumped. Ed, Heidi and I looked over the
entire interior of the supply. We did not see any indication of damage to
any components. Perhaps the unusual sound was only an acoustic effect.
The solenoids that hold the output contactors closed had similar current
through them, and they seemed to be holding OK. I replaced the control
board on the Left Q1 supply. The supply dumped again. Looking into things
some more it seemed like the leadflows might be a bit low. They seemed to
be lower than where we had marked the preferred rate on the side of the
rotameters. The increase in the flow rates might do the trick.
Unfortunately the replacement control board did not have the correct
setting for interpreting the polarity bit readback. This is a
programmable setting. For the time being the readback is opposite of what
the polarity actually is. As soon as possible we will get that corrected.