Siemens AG SPR8-230.840.01.05.02 MOBILETT XP
11.05 CS SD 24
Basic functions 57
Page 57 of 72
Medical Solutions
High-voltage circuit 0
Principle of operation 0
The high-voltage circuit is to reach the selected high-voltage as quickly as possible and
keep it constant during the exposure.
The high-voltage circuit is made up of the following components:
- D916 (CPU)
- Main inverter on D962
- Oscillating circuit capacitor C1
- High-voltage transformer in the single tank
- D907 measurement data log
- Intermediate circuit, capacitor bank D972
The high-voltage inverter is not active in standby.
With "exposure preparation", the nominal kV of D916 is output (measurable at TP-KVS
D916).
During exposure, D916 controls and monitors the high-voltage.
The high-voltage can be measured as test points TP-KVN, TP-KVP (1 V = 10 kV) and
TP-KV (1 V = 30 kV, total kV) on D916.
Sample high-voltage measurements 0
Positive/negative high-voltage measurement
• Switch off the system
• Remove the top cover and, in the case of MOBILETT XP Digital, place it on its side on a
table or similar surface (do not disconnect any cable connections)
• Possible error messages of the high-voltage circuit:
ERR 4 Static short-circuit at the main inverter
ERR 8 Static kV measured value <> 0
ERR 31 kV exceeds permissible limit
ERR 34 X-ray current exceeds permissible limit (tube short-circuit)
ERR 35 Short-circuit at the main inverter
ERR 37 Error in the kV control loop
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