Operation
1. Switch off the circuit-breaker ①. Only now can you remove the coded key ② for the key
transfer unit ③.
2. Use the key ② to unlock the keys in the key transfer unit ③.
3. Remove the keys ④ and release the locks ⑤ on the cabinet doors.
Note
The circuit-breaker cannot be closed again until the keys have been returned to the key transfer
unit, the key transfer unit has been locked, and the coded key is back in the circuit-breaker.
See also
Safety locking system (option M10) (Page 78)
9.4 Preventive maintenance
9.4.1 Inspection
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 environmental conditions at the location of use.
The following servicing and inspection instructions are used as the basis for regular inspection
of the equipment.
9.4.2 Checklist for preventive maintenance work
Maintenance Carried out by: Frequency Comments
Clean the cabinet (exterior) Operator As required Visual check, clean if required.
Clean the cabinet (interior) Siemens serv‐
ice personnel
Annually Visual check, clean if required.
Check the electrical con‐
nections (external power
and test connections) and
check the cable/screw ter‐
minals.
Operator After 1 year
and then every 4 years.
Check the cable and screw termi‐
nals regularly to ensure that they
are secure. Tighten them if nec‐
essary.
Check the internal connec‐
tions.
Siemens serv‐
ice personnel
After 1 year
and then every 4 years.
Carry out inspection and
visual check.
Siemens serv‐
ice personnel
Annually Refer to the following pages
Maintenance
9.4 Preventive maintenance
SINAMICS SM150 6SL3845-7NN46-7AA0
Operating Instructions 04/2017 163
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