Siemens MOBILETT Plus Service Instructions Manual page 63

Capacitor bank
•
Remove the cap and foam rubber from the capacitor module.
•
Measure the voltage in all capacitor series and check that the voltage level is the same
as on the main bar <10 V DC. If a series has a different voltage from the rest, the fuse
may possibly have blown. Discharge that series with R103 (Fig. 8).
•
Check all rubber membranes through the inspection holes at the top of the capacitors.
If there are cracks or holes in the membrane, the capacitor must be replaced.
WARNING
If you cannot determine the error visually, perform tests A - D on the capacitor series with
the blown fuse.
A Remove the fuse and + bar in the defective series. Wait 5 minutes.
B Measure the voltage in all capacitors in that series. The defective capacitor will have
a lower voltage than the rest.
C Replace both the defective capacitor and the fuse in the defective series.
D If the fuse has blown and no defective capacitor is found, replace all the capacitors
and the fuse in the defective series.
Siemens-Elema AB
Solna, Sweden
Electric shock hazard!
Risk for physical injury.
Prior to installing a new capacitor or a new fuse, ensure that the
voltage difference between capacitor series or capacitor modules
does not exceed 2 volts.
SPR8-215.898.01
Rev. 05
Fig. 8
Page 5 of 6
01.02 SPS-UD
7 - 5
MOBILETT Plus / - E/ - M