Siemens SINAMICS SH150 Operating Instructions & Installation Instructions page 109

Checking the capacitor bank
1. Optically inspect the capacitor bank for damage, traces of discharge or similar phenomena.
2. Measure the capacitance of the capacitor bank between connections "-" and "0" or "+" and
Installing a power cell
Execute the steps described in the section "Removing the power cell" in the reverse order.
SINAMICS SH150 6SL3805
Operating Instructions 05/2020
"0".
The capacitance value of the installed capacitors is stamped on a label located on the inner
side of one of the drive doors.
①
Label in the cabinet door
②
Circuit example of the capacitor bank
Figure 9-11 Example diagram: Capacitance of the capacitor bank
In the example, five capacitors each with a value of 1.2 mF are installed. The value in this
example must have at least 6 mF up to max 6.3 mF with a tolerance of max. + 5 %. Any
deviation of the measured capacitance signifies one or several defective capacitors. In this
case, replace the capacitor bank.
NOTICE
Malfunction when replacing individual capacitors
It is not permissible to individually replace capacitors in the capacitor bank. If this is not
observed, this can result in malfunction.
● Only replace the complete capacitor bank.
Maintenance
9.7 Repair
109