my Umas does not reach standby my contactor keeps engaging and disengagin causing my gantry not to reach standby what would be the possibly cause my system was not shut down correctly.....
Equipment: Siemens - Somatom Definition AS
Sun Mar 01 2026
gantry boot up problem
Mon Mar 02 2026Reply from Jlinton
Most common causes:
24V control supply unstable (weak PSU or blown secondary fuse)
Pre-charge circuit fault (DC link not reaching threshold, so contactor drops)
Interlock chain open (E-stop, door, coolant flow, overtemp)
UPS/battery in gantry cabinet weak
Short or leakage on DC bus causing undervoltage trip
James Linton, MiM, PmP, Cmbb, AAMIF
Biomedical Engineering Technology
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