User name jpchen
Log entry time 18:48:51 on January24,2002
Entry number 80590
keyword=Target motion problem
I was called in for target motion problem: target stopped in-between
optics target and LH2 with radiator position (encoder 2831126) while moving
from BeO to LH2 without radiator. Brake and error status were on.
Clear Slected Record did not help. After reboot ioc, I saw the 1st up limit
light on briefly. Tried to move again. It stopped at 3881729 (close to LH2
without radiator), when the first down limit light on briefly. Then brake and error
lights on. IOC crashed afterwards. After reboot ioc, I moved the target in position
by type in the encoder value. Watched for a while and noticed the power fail light up
twice and 1st up limit light once. Probably communication problem.
Talked to Chris Keith over the phone and he will look at the problem tomorrow.
For now, I'll suggest to move the target by typing in encoder position, but need to be
At the meantime, the high power heater PID did not work. Chris made modification
earlier. After talking to Chris, he un-did the change and it works now.