9 Maintenance...............................................................................................................................................91
9.1 Safety instructions for maintenance.......................................................................................91
9.2 Grounding the system............................................................................................................93
9.2.1 Grounding using the grounding harness................................................................................94
9.3 Opening the device................................................................................................................95
9.4 Preventive maintenance.........................................................................................................96
9.4.1 Inspection...............................................................................................................................96
9.4.2 Checklist for preventive maintenance work............................................................................96
9.4.3 Visual inspections..................................................................................................................97
9.4.3.1 Equipment for visual inspections............................................................................................97
9.4.3.2 Checking the isolating clearances..........................................................................................97
9.4.3.3 Checking hoisting solenoids and security bolts......................................................................97
9.4.3.4 Checking the plug connections..............................................................................................97
9.4.3.5 Checking the filter mats..........................................................................................................98
9.4.3.6 Checking the cable and screw terminals................................................................................98
9.4.3.7 Checking the cooling circuit...................................................................................................98
9.5 Maintenance...........................................................................................................................99
9.5.1 Replacing a fan......................................................................................................................99
9.5.1.1 Replacing fans, from the front................................................................................................99
9.5.1.2 Replacing fans, from the back..............................................................................................100
9.5.2 Replacing filter mats.............................................................................................................101
9.6 Cleaning...............................................................................................................................102
9.6.1 Removing dust deposits.......................................................................................................102
9.6.2 Cleaning aluminum parts.....................................................................................................102
9.7 Repair...................................................................................................................................103
9.7.1 Reference to the safety instructions section........................................................................103
9.7.2 Components that can be replaced.......................................................................................104
9.7.3 Torques................................................................................................................................105
9.7.4 Replacing the AVT combination module..............................................................................106
9.7.5 Replacing the current transformer........................................................................................107
9.7.6 Replacing the double submodule.........................................................................................108
9.7.7 Replacing water sensors......................................................................................................114
10 Spare parts...............................................................................................................................................117
11 Disposal....................................................................................................................................................119
11.1 Disposing of packaging material..........................................................................................119
11.2 Removing device components and old devices...................................................................119
11.3 Bypass disposal...................................................................................................................120
A Service & Support.....................................................................................................................................121
A.1 Siemens Industry Online Support........................................................................................121
B Technical data and drawings....................................................................................................................123
B.1 Standards and regulations...................................................................................................123
B.2 Environmental conditions.....................................................................................................123
B.3 Plant-specific information.....................................................................................................124
Table of contents
SINAMICS SM120 6SL38855?B
8 Operating Instructions 12/2015
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