Drive (CDM) Design
T1689 Technical Manual Rev 07
Mechanical Design principles
MV3000 Air Cooled DELTA
Page 84
3.5.4.2
Routing Of Control Cables
Ribbon cables between control components and between control components and the DELTA modules must
be:
•
Run along earthed metal, not through ‘mid-air’.
•
Select the cable lengths to allow this routing, refer to Section 2: Specification for available
lengths.
•
Segregated from power cables and from external plant wiring.
•
Not extended. If the ribbons are too long, fold the excess length backward and forward (do not
roll) to make a low-inductance bundle.
3.5.4.3
Routing Of Power Cables
Minimise large current loops e.g. High current components close together, cables should be arranged in tri-foil,
and DC+ run immediately against DC-.
Figure 3–3 Trefoil Cable
Avoid eddy currents in metal work by passing the current flow and return conductors through the same hole
e.g. DC+ with DC-, or R and S with T for 3phase cabling.
Position high power components together to minimise interconnection cable lengths to reduce cable power
loss, radiated (RF) noise and cable costs.
Ensure that the power cabling to high frequency (hf) shunt filters (e.g. PWM filter) does not cause the hf
current to bypass that component:
•
Run the series current path through the filter, see Figure 3–4. Any parallel connections must use
low inductance techniques such as flat and wide busbars, short trefoil cables or parallel cables.
Poor filtering as HF Current bypasses filter.
Good filter performance
Figure 3–4 Cable Routing Effect On Filter Performance
FILTER
HF
HF
50/60Hz
50/60Hz
(PARALLEL
CONNECTED)
(SERIES
CONNECTED)
HF
FILTER
HF
HF
HF
50/60Hz
50/60Hz
(PARALLEL
CONNECTED)
(SERIES
CONNECTED)
