Siemens SINAMICS S120 Manual page 239

Cable and screw terminals
Cable and screw terminals must be checked regularly to ensure that they are securely in
position and, if necessary, retightened. Cabling must be checked for defects. Defective parts
must be replaced immediately.
Note
Maintenance intervals
The actual intervals at which maintenance procedures are to be performed depend on the
installation conditions (cabinet environment) and the operating conditions.
Siemens offers its customers support in the form of a service contract. For further details,
contact your regional office or sales office.
Tightening torques for screw connections
The following tightening torques apply when tightening current-conducting connections (DC-
link connections, motor connections, busbars, lugs) and other connections (ground
connections, protective conductor connections, steel threaded connections).
Table 7- 1
Note
Screw connections for protective covers
The threaded connections for the protective covers made of Makrolon may only be tightened
with 2.5 Nm.
Maintenance work at the main switch or circuit breaker
For an optionally installed main switch or circuit breaker, the inspection must be carried out
at the intervals specified in the attached description.
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A
Tightening torques for screw connections
Thread Ground connections, protective
conductor connections, steel
M3
M4
M5
M6
M8
M10
M12
M16
threaded connections
1.3 Nm
3 Nm
6 Nm
10 Nm
25 Nm
50 Nm
88 Nm
215 Nm
Maintenance and servicing
7.3 Servicing the cabinet
Aluminum threaded connections,
plastic, busbars, lugs
0.8 Nm
1.8 Nm
3 Nm
6 Nm
13 Nm
25 Nm
50 Nm
115 Nm
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