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9.2
Grounding the system
Danger due to high voltage after shutdown
High voltages can still be present even after shutdown. Touching the device can result in death
or serious injury.
● Only work on the power unit if it has been sufficiently grounded. Before touching the device,
● Always observe the five safety rules (Page 11) when carrying out any work on the device.
Use a three-pole grounding harness for fixed ball points to ground the system. When ordering
a grounding harness, contact Service & Support.
Use a sufficient number of grounding harnesses corresponding to the configuration. A
grounding harness is required for each three-phase system.
9.3
Preventive maintenance
The purpose of an inspection is to ascertain and evaluate the current status of the equipment.
An inspection mainly comprises visual checks. Inspections should be carried out based on a
schedule that meets the needs of the special ambient conditions at the location of use. The
following servicing and inspection instructions are used as the basis for regular inspection of
the equipment.
Maintenance work
Check the cooling system
Clean the outside of the cab‐
inet
Clean the inside of the cabi‐
net
Check power and control
connections
Check internal connections
Carry out an inspection and
visual check
Check spare parts
SINAMICS SL150 6SL38655UM427AA02
Operating Instructions Rev.201910281507 EXAMPLE
WARNING
carefully ensure that the following parts of the power unit are de-energized and are in a no-
voltage condition:
– Internal busbars
– Input and output terminals
– Auxiliary power supply
Carried out by
Frequency
Operating com‐
After one year
pany
Operating com‐
As required
pany
Siemens serv‐
Annually
ice personnel
Operating com‐
After one year, and every
pany
four years thereafter
Siemens serv‐
After one year, and every
ice personnel
four years thereafter
Siemens serv‐
Annually
ice personnel
Siemens serv‐
Annually
ice personnel
Maintenance
9.3 Preventive maintenance
Comments
See the specifications in
the Operating Instructions
Visual inspection, clean if
required
Visual inspection, clean if
required
67
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