56 Basic functions
MOBILETT XP SPR8-230.840.01.05.02 Siemens AG
11.05 CS SD 24
Page 56 of 72
Medical Solutions
Mode of operation of the anode starter 0
The anode starter on D927 is fed by the intermediate circuit voltage of the capacitor bank.
The "preparation" function causes the rotating anode to start up (150 Hz). The anode runs
freely during the exposure. The started anode stator is not supplied with voltage. At the
end of exposure, the anode is braked.
The anode starter is controlled by D916 (CPU).
The rotating anode motor in the single tank functions as a single-phase motor with a
phase-shifted auxiliary phase via capacitor C2.
The anode starter is not activated in standby.
D916 monitors the motor current through measuring signals TP-I1 and TP-I2 and thus
protects anode operation. If a phase is missing or the motor current is outside the permit-
ted range, the system interrupts the anode starting function and brakes the anode.
The braking process of the anode rotation lasts around 5 seconds. The system subse-
quently switches over to standby.
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