iMC-S8
– operating instruction
page - 7
Warning! High earth leakage current (ground discharge current,
protection conductor current).
Before connecting to the AC supply
network, it is necessarily required an
additional protective grounding
.
Before connecting the CNC controller to the AC supply network, an
additional protective grounding
(cross section: 2.5 mm
2
or 4 mm
2
,
see below) has to be connected! Before the electrical start-op of the
controllers a protective grounding of 2.5 mm
2
(protected installation) or a
protective conductor of 4 mm
2
(unprotected installation) has to be
connected durably to the marked clamping point
at the back of the
housing where the cross section of the protective grounding shall not be
less than 10 mm
2
copper or 16 mm
2
aluminum has (e.g. electrical
distribution of the building). Please instruct an electrician with these
implementation. When using the Residual Current circuit Device (RCD)
for line fuses/fault current delimitation: Do not use an RCD with AC
characteristics. Using a frequency inverter and choppered power stages
in the power units may cause superimposed AC fault units with pulsating
direct current and direct current apart from AC fault currents. Please
consult your electrician.
The term leakage is understood here as grounding discharge
current. This is defined in the standard EN 60204-1:2006 section
8.2.8, note 1
If the CNC machine (ideal) is set up isolated from the reference
potential, the grounding discharge current is equal to the
protective grounding stream.
