Exposure Preparation; Rotating Anode Starter - Siemens MOBILETT Plus HP Service Manual

Supplement to Functional Description

Exposure preparation

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Rotating anode starter

To get the rotating anode up to speed a control signal with a frequency of 160 Hz is
applied to the two test points "ROT A" and "ROT B" on board D4.
The run-up-time requires two seconds. After this the control signal is switched off and the
anode runs freely. If the anode looses speed and a frequency <147 Hz is measured, the
anode is accelerated for 0,75 s. These additional "pushes" are repeated, if necessary,
until the limit of the preparation time (20 s) or until the release of an exposure. A push is
interrupted if an exposure signal is made.
The anode is up to speed if the pulse frequency "ROT" is > 147 Hz after the run-up-time of
2 s.
If the frequency detected is below 147 Hz the entire run-up procedure will be repeated
and the reached speed will be measured again.
If the second try indicates that the required speed of 147 Hz is now exceeded, the control
system generates the internal message "anode up to speed"! This completes the prepara-
tion together with exposure heating on.
The green "ready" LED on the control-panel turns on and the buzzer generates three
beep tones.
The magnetization in the stator and rotor winding produces an eddy current field which
slows down the speed of the rotor. The brake time to a full stop takes 9 s.
Siemens-Elema AB
Solna, Sweden
The primary contact in the exposure-release switch is first closed. This initiates
the following functions:
switches off the preheating,
switches on the exposure heating,
starts the two second rotating-anode acceleration,
if the anode frequency after acceleration is >147 Hz, the buzzer on board D3
generates three beep tones, and
the green "ready" LED on the control panel is turned on.
SPR8-220.091.01
Rev. 03 03.03
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