Maintenance And Servicing; Chapter Content; Cleaning The Cabinet - Siemens SINAMICS S120 Equipment Manual

Maintenance and servicing

6.1

Chapter content

This chapter provides information on the following:
● Maintenance and servicing procedures that have to be carried out on a regular basis to
● Replacing device components when the unit is serviced
● Reforming the DC link capacitors
Before carrying out maintenance or repair work on the de-energized cabinet, wait for 5
minutes after switching off the power supply. This allows the capacitors to discharge to a
harmless level (< 25 V) after the line voltage has been switched off.
Before starting work, you should also measure the DC link voltage after the 5 minutes have
elapsed. The voltage can be measured on DC link terminals DCP and DCN.
When the external power supply (e.g. option L55) or the external 230 V auxiliary infeed or
supply infeed is connected, dangerous voltages are still present in the cabinet even when
the main breaker is open.
Beware of any residual rotation of the fan.
6.2

Cleaning the cabinet

The cabinet comprises mostly electronic components. Apart from the fan(s), therefore, it
contains hardly any components that are subject to wear or that require maintenance or
servicing. The purpose of maintenance is to preserve the specified condition of the cabinet.
Dirt and contamination must be removed regularly and parts subject to wear replaced.
The following points must generally be observed.
Dust deposits
Dust deposits inside the cabinet must be removed at regular intervals (or at least once a
year) by qualified personnel in line with the relevant safety regulations. The unit must be
cleaned using a brush and vacuum cleaner, along with dry compressed air (max. 1 bar) for
areas that cannot be easily reached.
Ventilation
The ventilation openings in the cabinet must never be obstructed. The fan must be checked
to make sure that it is functioning correctly.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
ensure the availability of the components
DANGER
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