COMBIMASTER & MICROMASTER Integrated
REFERENCE MANUAL
©
Siemens plc. 1999
| G85139-H1731-U300-D2
12
W
V
U
N
TB1
W
V
U
N
TB1
U1
U2
V1
V2
W1
W2
PTC
wires
Earth connection
Star connection
Delta connection
Earth connection
Figure 1 Motor Wire Connection.
WARNING
It is essential that the MIP is correctly earthed to the motor. This is usually achieved
using a short earth cable connected between the MIP and a suitable connection point on
the motor. Death or severe injury can result if the motor is not correctly earthed.
Incorrect earthing can also prevent any MICROMASTER Integrated built-in EMC filter
from operating correctly.
4.3 Electrical Installation I
COMBIMASTER and MICROMASTER Integrated
Procedure
Remove the four cross-head screws on the
inverter's cover to access the electrical
terminals.
For details of cable sizes, refer
to the Electrical Data (section
8.4) of this document.
A ‘drip loop’ is recommended
when connecting the mains and
control cables (
see Fig. 6
).
CAUTION
The printed circuit boards contain CMOS components that are particularly sensitive to
static electricity. For this reason avoid touching the boards or components with your bare
hands or metal objects.
4.4 Mains Cable Connections
Ensure that the power source supplies the
correct voltage and is designed for the
rated current. Use the appropriate circuit-
breakers with the specified current rating
between the power supply and inverter.
Use Class 1 60/75
o
C copper wire only. Use
a 4-core screened cable. If crimp terminals
are used they must be insulated. If crimps
are not used, the strip length must not
exceed 5mm.
Feed the power cable into the inverter via
the gland hole nearest to the motor shaft.
Connect the power leads to terminals L1,
L2, L3 (L1, L2 for single phase units) and
the separate earth.
Use a 4 - 5 mm cross-tip screwdriver to
tighten the terminal screws
