Electrical Installation; General Wiring Guidelines; Electrical Installation Imicromaster Integrated - Siemens COMBIMASTER Reference Manual

COMBIMASTER & MICROMASTER Integrated
REFERENCE MANUAL

4. ELECTRICAL INSTALLATION

WARNING
Take note of the general and regional installation and safety regulations regarding work
on high voltage installations (e.g. VDE). Adhere to relevant regulations regarding correct
use of tools and protective gear.

4.1 General Wiring Guidelines

The Case size A (CS A) and Case Size B
(CS B) COMBIMASTER is designed to
operate in an industrial environment where
a high level of Electro-Magnetic
Interference (EMI) can be expected.
Usually, good installation practices will
ensure safe and trouble-free operation.
However, if problems are encountered, the
following guidelines may prove useful. In
particular, grounding of the system 0V at
the inverter, as described below, may prove
effective.
All equipment must be well earthed using
1
short, thick earthing cable connected to a
common star point or busbar. It is
particularly important that any control
equipment connected to the inverter (such
as a PLC) is connected to the same earth
or star point as the inverter via a short,
thick link. Flat conductors (e.g. metal
brackets) are preferred as they have lower
impedance at high frequencies.
4.2 Electrical Installation I
The motor wires should be connected in
either star or delta configuration on the MIP
(check motor rating plate).
Star Connection
Wire
U2/V2/W2
U1
V1
W1
Siemens plc. 1999
© | G85139-H1731-U300-D2
MICROMASTER Integrated
Terminal
N
U
V
W
Use screened leads for connections to the
2
control circuitry. Terminate the ends of the
cable neatly, ensuring that long strands of
unscreened wire are not left visible.
Separate the control cables from the
3
power connections as much as possible,
using separate trunking, etc. If control and
power cables cross, arrange the cables so
that they cross at 90°.
Ensure that contactors are suppressed,
4
either with R-C suppressers for AC
contactors or 'flywheel' diodes for DC
contactors, fitted to the coils. Varistor
suppressers are also effective.
Safety regulations must not be
compromised when installing the
COMBIMASTER or MICROMASTER
Integrated !
Delta Connection
Wire
U1/W2
U2/V1
V2/W1
Terminal
U
V
W
11