Drive (CDM) Design T1689 Technical Manual Rev 07
Component Selection – Electrical MV3000 Air Cooled DELTA
Page 96
Current Rating Of Connections
Simple formulae are provided to allow the quick selection of power cable current rating (ampacity) between
power modules. Leave a margin in the sizing based on these simple formulae or use a detailed circuit analysis
for accurate size calculations:
For drives supply power to motors:
=
√3 ×
..
×
×
..
=
√
3
×
.
×
×
×
×
Where:
= ℎ
= ℎ
= ℎ
..
= 1.6 ×
..
..
= 1.35 ×
..
=
= ℎ
1.05,
1.1
Also:
..
=
1.04×
..
(i.e. 4% sharing allowance)
..
=
1.04×
..
(i.e. 4% sharing allowance)
..
=
1.1×
..
(i.e. 10% sharing allowance)
NOTE: The rectifier part number gives the d.c. current in Amps, i.e. MVRL1600 = 1600 A d.c. and is designed for
cable connection only.
Temperature Rating
• There is limited space for power cabling to the a.c. connections on the DELTA power modules and
so the connections are intended for use with high temperature cables.
• The a.c. and d.c. terminal insulation in the DELTA power module limit the maximum allowed
conductor temperature of the interconnection cable. This is usually 125°C (257F), but refer to
the individual component specifications for actual component values.
• Beware that non-DELTA parts may have lower temperature limits, for example cable supports,
cable ties, terminals and adjacent insulation.
• To minimise inductance the cables are normally arranged in trefoil, so the cable
rating / temperature rise requires the appropriate bunching factor.
Examples of high temperature 125°C (257F) or above cables are:
• Silicon rubber, e.g. or Nexans type SIWO-KUL (www.nexans.com ) or
• Polyolefin, e.g. Huber and Suhner type Radox 125 (www.hubersuhner.com).
These cables are intended for inter-connection within the enclosure (not field wiring terminals).
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