Siemens MOBILETT Plus Manual page 21

Capacitor-bank charging circuit
The block diagrams and the wiring diagram X037E, sheet 130 are the basis for the func-
tional description given below.
The entire charging circuit includes the boards D8, D1 and D7 and the capacitor bank,
M1.
MOBILETT Plus
The capacitor bank contains four modules with 26 capacitors in each module. Each single
capacitor value is 3100 µF, 360 V. The theoretical capacitance is 0.32 F.
MOBILETT Plus E;
The capacitor bank contains three modules, two with 26 capacitors and one with 14
capacitors. Each single capacitor value is 3100 µF, 360 V. The theoretical capacitance is
0.2 F.
On board D7 three logic signals control the charging of the capacitor bank, M1.
The voltage of the capacitor bank can be measured with a digital voltmeter at the test
points "CAPPOS" and "CAPNEG" on board D7.
The actual value of the capacitor voltage is fed with the signal "CAPVOL" to the CPU
board D1. There the value is monitored by the microprocessor SAB 80C535.
The voltage level at "CAPVOL" determines when the following control signals are issued:
•
"CHARGE HIGH"
•
"CHARGE LOW" and
•
"DISCHARGE"
•
"ready" is used to control the green LED on the Control and display panel.
Siemens-Elema AB
Solna, Sweden
"CHARGE HIGH"
"CHARGE LOW" for maintaining the kV-dependent final voltage
attained over the capacitor bank, M1
"DISCHARGE" for the controlled discharge of the capacitor bank, M1.
Register 6 SPR8-215.850.02
Rev. 01
for charging with high power
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01.02 SPS-UD
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MOBILETT Plus/ Plus E