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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:
𝐶𝐶𝐶𝐶𝐶𝐶
𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇
𝑂𝑂𝑂𝑂𝑇𝑇𝑂𝑂𝑂𝑂𝑇𝑇
𝐶𝐶𝑂𝑂𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇
=
𝑃𝑃
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
√
3 ×
𝑉𝑉
𝑇𝑇
.
𝑐𝑐
.
𝐶𝐶𝑟𝑟𝑟𝑟
×
𝑝𝑝𝑝𝑝
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
×
𝜂𝜂
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
𝐶𝐶𝐶𝐶𝐶𝐶
𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇
𝑑𝑑
.
𝑐𝑐
.
𝑐𝑐𝑂𝑂𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇
=
𝑃𝑃
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
√
3 ×
𝑉𝑉
𝑑𝑑
.
𝑐𝑐
×
𝑝𝑝𝑝𝑝
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
×
𝜂𝜂
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
×
𝜂𝜂
𝑇𝑇𝑂𝑂𝑇𝑇𝑂𝑂𝑂𝑂𝑇𝑇
𝑏𝑏𝐶𝐶𝑏𝑏𝑑𝑑𝑏𝑏𝐶𝐶
×
𝐼𝐼
𝐶𝐶𝑏𝑏𝑂𝑂𝑂𝑂𝑇𝑇𝐶𝐶
𝑓𝑓𝑇𝑇𝑐𝑐𝑇𝑇𝑇𝑇𝐶𝐶
Where:
𝑃𝑃
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
=
𝐶𝐶𝑀𝑀𝑀𝑀ℎ𝑖𝑖𝑖𝑖𝑖𝑖
𝑃𝑃𝑃𝑃𝑃𝑃𝑖𝑖𝑃𝑃
𝑝𝑝𝑝𝑝
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
=
𝐶𝐶𝑀𝑀𝑀𝑀ℎ𝑖𝑖𝑖𝑖𝑖𝑖
𝑝𝑝𝑃𝑃𝑃𝑃𝑖𝑖𝑃𝑃
𝑝𝑝𝑀𝑀𝑀𝑀𝑓𝑓𝑃𝑃𝑃𝑃
𝜂𝜂
𝑀𝑀𝑇𝑇𝑇𝑇𝑇𝑇𝐶𝐶
=
𝐶𝐶𝑀𝑀𝑀𝑀ℎ𝑖𝑖𝑖𝑖𝑖𝑖
𝑖𝑖𝑝𝑝𝑝𝑝𝑖𝑖𝑀𝑀𝑖𝑖𝑖𝑖𝑖𝑖𝑀𝑀𝑦𝑦
𝑉𝑉
𝑑𝑑
.
𝑐𝑐
.
= 1.6 ×
𝑉𝑉
𝑇𝑇
.
𝑐𝑐
.
𝐶𝐶𝑟𝑟𝑟𝑟
𝑇𝑇𝑦𝑦𝑝𝑝𝑖𝑖𝑀𝑀𝑀𝑀𝑇𝑇𝑇𝑇𝑦𝑦
𝑝𝑝𝑃𝑃𝑃𝑃
𝐴𝐴𝐴𝐴𝐶𝐶
𝑑𝑑𝑃𝑃𝑖𝑖𝑑𝑑𝑖𝑖𝑑𝑑
𝑉𝑉
𝑑𝑑
.
𝑐𝑐
.
= 1.35 ×
𝑉𝑉
𝑇𝑇
.
𝑐𝑐
.
𝐶𝐶𝑟𝑟𝑟𝑟
𝑝𝑝𝑃𝑃𝑃𝑃
𝐶𝐶𝐷𝐷𝐴𝐴
𝑑𝑑𝑃𝑃𝑖𝑖𝑑𝑑𝑖𝑖𝑑𝑑
𝜂𝜂
𝑇𝑇𝑂𝑂𝑇𝑇𝑂𝑂𝑂𝑂𝑇𝑇
𝑏𝑏𝐶𝐶𝑏𝑏𝑑𝑑𝑏𝑏𝐶𝐶
=
𝐴𝐴𝑝𝑝𝑝𝑝𝑖𝑖𝑀𝑀𝑖𝑖𝑖𝑖𝑖𝑖𝑀𝑀𝑦𝑦
𝑃𝑃𝑝𝑝
𝑃𝑃𝑜𝑜𝑓𝑓𝑝𝑝𝑜𝑜𝑓𝑓
𝑏𝑏𝑃𝑃𝑖𝑖𝑑𝑑𝑑𝑑𝑖𝑖
𝐼𝐼
𝐶𝐶𝑏𝑏𝑂𝑂𝑂𝑂𝑇𝑇𝐶𝐶
𝑐𝑐𝑂𝑂𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇
=
𝑀𝑀𝑑𝑑𝑑𝑑𝑖𝑖𝑓𝑓𝑖𝑖𝑃𝑃𝑖𝑖𝑀𝑀𝑇𝑇
𝑝𝑝𝑀𝑀𝑀𝑀𝑓𝑓𝑃𝑃𝑃𝑃
𝑝𝑝𝑃𝑃𝑃𝑃
𝑓𝑓ℎ𝑖𝑖
𝑃𝑃𝑖𝑖𝑝𝑝𝑝𝑝𝑇𝑇𝑖𝑖
𝑏𝑏𝑖𝑖𝑓𝑓𝑃𝑃𝑖𝑖𝑖𝑖𝑖𝑖
𝑖𝑖𝑖𝑖𝑝𝑝𝑜𝑜𝑓𝑓
𝑀𝑀𝑖𝑖𝑑𝑑
𝑃𝑃𝑜𝑜𝑓𝑓𝑝𝑝𝑜𝑜𝑓𝑓
𝑏𝑏𝑃𝑃𝑖𝑖𝑑𝑑𝑑𝑑𝑖𝑖𝑑𝑑
𝑝𝑝𝑃𝑃𝑃𝑃
𝐴𝐴𝐴𝐴𝐶𝐶
𝑀𝑀𝑑𝑑𝑑𝑑𝑜𝑜𝑎𝑎𝑖𝑖
1.05,
𝑀𝑀𝑖𝑖𝑑𝑑
𝐶𝐶𝐷𝐷𝐴𝐴
1.1
Also:
𝐼𝐼
𝑇𝑇
.
𝑐𝑐
.
𝑐𝑐𝑂𝑂𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇
𝑂𝑂𝐶𝐶𝐶𝐶
𝐷𝐷𝐸𝐸𝐸𝐸𝑇𝑇𝐸𝐸
𝑇𝑇𝐶𝐶𝑇𝑇𝐶𝐶𝑟𝑟𝑏𝑏𝑟𝑟𝑇𝑇𝑇𝑇𝐶𝐶
𝑟𝑟𝑇𝑇𝑑𝑑𝑂𝑂𝑇𝑇𝐶𝐶
=
1
.
04
×
𝐼𝐼
𝑎𝑎
.
𝑐𝑐
.
𝑇𝑇𝑇𝑇𝑇𝑇𝑎𝑎𝑇𝑇
𝐶𝐶𝐶𝐶𝐶𝐶
𝑁𝑁𝑂𝑂𝑟𝑟𝑏𝑏𝐶𝐶𝐶𝐶
𝑇𝑇𝑜𝑜
𝑇𝑇𝑇𝑇𝑎𝑎𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇
𝑚𝑚𝑇𝑇𝑚𝑚𝑚𝑚𝑇𝑇𝑚𝑚𝑇𝑇
(i.e. 4% sharing allowance)
𝐼𝐼
𝑑𝑑
.
𝑐𝑐
.
𝑐𝑐𝑂𝑂𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇
𝑂𝑂𝐶𝐶𝐶𝐶
𝐷𝐷𝐸𝐸𝐸𝐸𝑇𝑇𝐸𝐸
𝑇𝑇𝐶𝐶𝑇𝑇𝐶𝐶𝑟𝑟𝑏𝑏𝑟𝑟𝑇𝑇𝑇𝑇𝐶𝐶
𝑟𝑟𝑇𝑇𝑑𝑑𝑂𝑂𝑇𝑇𝐶𝐶
=
1
.
04
×
𝐼𝐼
𝑚𝑚
.
𝑐𝑐
.
𝑇𝑇𝑇𝑇𝑇𝑇𝑎𝑎𝑇𝑇
𝐶𝐶𝐶𝐶𝐶𝐶
𝑁𝑁𝑂𝑂𝑟𝑟𝑏𝑏𝐶𝐶𝐶𝐶
𝑇𝑇𝑜𝑜
𝑇𝑇𝑇𝑇𝑎𝑎𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇
𝑚𝑚𝑇𝑇𝑚𝑚𝑚𝑚𝑇𝑇𝑚𝑚𝑇𝑇
(i.e. 4% sharing allowance)
𝐼𝐼
𝑑𝑑
.
𝑐𝑐
.
𝑐𝑐𝑂𝑂𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇
𝑂𝑂𝐶𝐶𝐶𝐶
𝐷𝐷𝐸𝐸𝐸𝐸𝑇𝑇𝐸𝐸
𝐶𝐶𝐶𝐶𝑐𝑐𝑇𝑇𝑏𝑏𝑓𝑓𝑏𝑏𝐶𝐶𝐶𝐶
𝑟𝑟𝑇𝑇𝑑𝑑𝑂𝑂𝑇𝑇𝐶𝐶
=
1
.
1
×
𝐼𝐼
𝑚𝑚
.
𝑐𝑐
.
𝑇𝑇𝑇𝑇𝑇𝑇𝑎𝑎𝑇𝑇
𝐶𝐶𝐶𝐶𝐶𝐶
𝑁𝑁𝑂𝑂𝑟𝑟𝑏𝑏𝐶𝐶𝐶𝐶
𝑇𝑇𝑜𝑜
𝑝𝑝𝑎𝑎𝑇𝑇𝑎𝑎𝑇𝑇𝑇𝑇𝑚𝑚𝑇𝑇
𝑚𝑚𝑇𝑇𝑚𝑚𝑚𝑚𝑇𝑇𝑚𝑚𝑇𝑇
(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).
Содержание MV3000 DELTA
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