Siemens AG SPR8-230.840.01.05.02 MOBILETT XP
11.05 CS SD 24
Function Check 49
Page 49 of 72
Medical Solutions
Checking the intermediate circuit/capacitor bank 0
DANGER
There is a risk of a lethal electric shock when troubleshooting at
the capacitor bank. Be careful when removing the safety cover in
front of D927 or when removing the capacitor bank.
¹ In the case of an error, the voltage at individual capaci-
tors C1-C12 can be > 40 V even after discharge of capaci-
tor bank C1-C12 (approx. 25 minutes), regardless of the
measured intermediate voltage.
NOTE
In the case of error and for all planned dismantling, disconnect the
supply cable to the capacitor charger (plug X3 on board D927).
For Hybrid/Digital, disconnect the four plugs of battery pack
BK1-BK4 and the 300 V supply cable plug to the capacitor bank.
In the case of an error, the capacitor bank must be completely dis-
mantled. This work is described in the "Replacement of parts" in-
structions SPR8-230.841... .
• Switch off the system and disconnect the power plug if necessary. In XP Hybrid, set the
operating mode switch to "0". Please observe all safety information.
• Remove the covers in the following order: the upper cover first, then the rear cover, and
finally all the side covers.
• Check or measure the current intermediate voltage with the system switched on (ca-
pacitor bank C10C12). Different checks are possible:
- At test point D916 TP "VC“ (13), (1 V^100 V )
- At fuse F5 D927 against GND. The safety cover of D927 must be removed for this
measurement.
- Visual inspection of LED displays V1-V12 on board D972 of the capacitor bank
(V/Fig. 17 / p. 50).
¹ As long as an LED lights up, the assigned capacitor is still charged > 40 V (refer
to Layout D972 of these instructions).
¹ If one or several LEDs on D972 is missing, the capacitor bank must be disman-
tled completely. (See "Replacement of parts, MOBILETT XP").
• Check fuse F5 - D927. Only measure and change the fuse when plug X3/D927 is dis-
connected and fuse F5 is voltage-free.
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