10 General
POLYMOBIL Plus SPR8-125.831.01.02.02 Siemens AG
05.05 CS PS 24
Page 10 of 40
Medical Solutions
DANGER
When working on the open unit there is a risk of electrical shock!
Non-compliance can lead to injuries or death.
Observe the following:
¹ The capacitor bank can still be charged. Do not attempt
to work on the system while this condition exists.
¹ After switching off the system, approximately 450 VDC
(350 VDC for Serial No. < 10100) may still be present in
the system even after disconnecting the line voltage
plug. Within 10 minutes this voltage will drop to approxi-
mately 10 V.
¹ Always measure the actual voltage present with the DVM
at test points -VCC and + VCC on the D 960 inverter
board or (more accessible) on the D 970 capacitor board
at the + connection point of capacitor C3 and on the right
side of fuse F3 (Fig.2/p.9).
¹ LEDs V1 ... V10 on D 970 go out at a significantly higher
voltage level and are therefore not reliable safety indica-
tors.
¹ If a fuse on the D 970 has responded, high voltage may
still be present at the affected capacitor even after a pro-
longed period of time.
¹ The capacitor discharge circuit utilizes the D925 board,
CS and LS relays. If connectors X3 or X9 on D 925 or D
950 are not inserted or if there is a defect in the circuit,
the C-bank will not discharge. This can cause life-threat-
ening voltage to be present in the system even after a
prolonged period of time.
¹ Also refer to the Polymobil Plus Service instructions
SPR8-125.061... "Replacing the capacitor bank".
• Connect the Polymobil Plus only to a line voltage supply (line voltage receptacle) that
complies with the requirements of VDE 0107 or corresponds to the local national regu-
lations.
• Disconnect the Polymobil Plus at the line voltage OFF switch on the operating console
and disconnect the line voltage plug prior to performing any service work.
• Remove or insert boards with the generator switched OFF only; observe ESD guide-
lines when handling boards.
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