Siemens SINUMERIK 802S Technical Manual page 34

Installing the Control System
Start-up switch (S3) This rotary switch is intended to assist start-up.
Fuse (F1)
S2 and D15
Grounding Screw
2-22
Position 0: Normal operation
Positions 1–4:Start-up
cf. also Section 4.2, Table 4–2
This design allows users to replace the fuse very conveniently when the fuse is
broken.
They are provided only for debugging internally.
In order to ensure the system functions correctly and safely, the CNC must be
grounded through the grounding screw on the rear side of CNC.
SINUMERIK 802S base line
Start-Up