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User name spiegel
Log entry time 13:54:46 on May 15, 2007
Entry number 202119
This entry is a followup to: 202064
keyword=RIGHT Bogie failure
Previous failure of Bogie required Hall entry and power "OFF" reset of
bogie crate. Checked GUI and fuction of bogie controls screen. Checked O.K.
Users began movement of RIGHT spectrometer in wrong direction(CCW) and
had a drive failure. Tried to reset system and drive in(CW) direction and
could not establish a FAC/RAC OK status for movement. Entered hall to
troubleshoot problem and discovered bogie power supply had a #1 PHASE
LOSS/Red LED indicator lit. Tried to recycle power. No help! Cycled 3
phase circuit breaker to bogie power. Also, No help. Measured across all
phases to Bogie power supply from contactor switch through 3 PH. Solid
State Relay(SSR) contacts. All phases measured appox. 107-110 VAC. Out
put of bogie power supply was 180VDC. ???? Swapped out power supply with
SPARE (PSM-125). Had same failure mode(PHASE LOSS)and no DC power output
to motor drivers. Reasoned that a loss of ampheres through SSR to supply
could be a problem. Removed SPARE Power supply, replaced it with original
and installed new spare 3 PH. Solid state relay. Restored power to bogie
system. Red LED was extinguished. Restored bogie control screen and
re-established OK for all fuctions.
A copy of this log entry has been emailed to: folts@jlab.org,stevensm@jlab.org,fansler@jlab.org