18
Preparation before wiring
：
Connect the protective ground wire (PE)
Connect
the
inverter
to
the
grounding
bar
through
the
protective
earth (PE)
to
achieve
grounding
protection.
Ø
Good
grounding
is
good
for
resisting
surge
voltage
impact
and
improving
EMI
performance
.
Therefore,you
need
to
ground
the
wire
before
connecting
the
AC,DC,and
communication
cables
.
Ø
For
a
single
-
machine
system,only
the
PE
cable
needs
to
be
grounded;For
a
multi
-
machine
system,the
PE
cables
of
all
inverters
need
to
be
connected
to
the
same
grounding
copper
bar
to
ensure
equipotential
connection
.
Ø
Disconnect
the
inverter
DC
switch,AC
side
circuit
breaker
or
switch
.
Ø
Measure the voltage and frequency of the public grid (voltage:AC 230V;
frequency:50Hz)
Ø
The
recommended
specifications
of
the
AC
output
switch
are
as
follows:
Inverter model
Switch specification
MID 17KTL3-X1
40A/230V
MID 20KTL3-X1
40A/230V
MID 22KTL3-X1
50A/230V
MID 25KTL3-X1
50A/230V
MID 30KTL3-X
80A/230V
MID 33KTL3-X
80A/230V
MID 36KTL3-X
100A/230V
MID 40KTL3-X
100A/230V
17
Fig 6.1 Grounding
diagram
AC connection steps(just for Vietnam models):
1.Pass the 5 wires (L1,L2,L3,N and PE wires) through the AC shield,connect them to the
power grid, and then crimp the O/U terminal.
2. Lock the AC cable to the corresponding AC terminal.
3.Lock the protective cover on the inverter frame, and finally tighten the protective cover
hole.
Fig 6.2
Fig 6.3
Fig 6.4
10-12mm
Noted:
Waterproof must be blocked with fireproof mud to prevent water.
