Siemens MOBILETT Plus Service Instructions Manual page 9

General
•
Measure the residual voltage at test points CAPPOS and CAPNEG on board D7 (Fig. 2).
The voltage measured must be less than 10 V.
WARNING
Fig. 3
- Make sure that the correct measurement range is set on the measurement device.
- Connect the measurement device to CAPPOS and CAPNEG.
- Switch S10 off. Connect the mains cable and switch the system ON.
- Check whether the voltage increases.
- Switch the system OFF, disconnect the mains cable and switch S10 on.
- Check whether the voltage decreases.
- If the measurement device indicates no voltage, check the measurement device.
- Measure the voltage for the capacitor bank at the bus bar. (Fig. 3).
WARNUNG WARNING
•
Only use insulated tools when pulling out the capacitor units.
Siemens-Elema AB
Solna, Sweden
If the voltage measured between CAPPOS and CAPNEG is 0V, the
measurement device could be defective or the wires between the
CAPPOS and CAPNEG test points on the capacitor bank could be
damaged.
The capacitors could still be charged.
In this case, proceed as follows:
If the charging/discharging does not function, the capacitor bank
must be considered "charged".
This means a risk of high voltage.
Use caution when performing measurements at the bus bar of the
capacitor bank. Use only the specified measurement devices
(350 V DC). If one of the fuses in the capacitor series has blown
out, this series must be considered fully charged.
SPR8-215.898.01
Rev. 05
Fig. 4
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01.02 SPS-UD
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MOBILETT Plus / - E/ - M