Quantum MP User Guide
39
Issue: A4 www.emersonct.com
4.8.1 Supply fault current
The maximum fault current level of the supply to all circuits is as follows:
See Table 2-1 on page 6 for model to frame size cross reference.
4.9 Cable and fuse size ratings
Maximum continuous input currents are given in section 2.2
page 6 to aid the selection of fuses and cabling. The maximum input
current is dependent on the ripple content of the output current. A value
of 100% ripple has been assumed for the given ratings.
The cable sizing selected when installing a Quantum MP must comply
with the local wiring regulations. The information provided in this section
is provided for guidance purposes only.
The power terminals on the Quantum MP size 1 have been designed to
accommodate a maximum cable size of 150mm
2
(350kcmil) with a
temperature rating of 75°C (167°F).
The actual cable size depends on a number of factors including:
•
Actual maximum continuous current
•
Ambient temperature
•
Cable support, method and grouping
•
Cable voltage drop
In applications where the motor used is of a reduced rating, the cable
sizing selected can be appropriate for that motor. To protect the motor
and the output cabling the drive must be programmed with the correct
motor rated current.
When using reduced cable sizes, the branch circuit protection fuse rating
needs to be reduced in line with the cable size selected.
The following table shows typical cable sizes based on USA and
International standards, assuming 3 conductors per raceway/conduit, an
ambient temperature of 40°C (104°F) and applications with high output
current ripple content.
Table 4-8 Typical cable sizes
1.
The maximum cable size is defined by the power terminal housing
using 90°C (194°F) rated cables as per Table A.52-5 of the
standard.
2.
Assumes the use of 75°C rated cables for drives rated more than
100 A output, 60°C for drives rated less than 100 A, as per Table
310.16 of the National Electrical Code.
The use of higher temperature rated cable would allow a reduction on
the minimum recommended cable size for Quantum MP shown above.
For high temperature cable sizing, please contact the supplier of the
drive.
Frame size
Supply fault current
1A, 1B
30kA
2A, 2B
5k A
The selection of the correct fuse is essential to ensure the
safety of the installation
Model
IEC 60364-5-52
[1]
UL508C/NEC
[2]
Input
Output
Input
Output
QMP45A4(R)
10mm
2
4 AWG
3 AWG
QMP75A4(R)
16mm
2
25mm
2
1 AWG
1/0 AWG
QMP155A4(R)
50mm
2
70mm
2
3/0 AWG
4/0 AWG
QMP210A4(R)
95mm
2
250kcmil
350kcmil
QMP 350A4(R)
120mm
2
2-35mm
2
350kcmil
2-2/0 AWG
QMP 400A4(R)
2-35mm
2
2-50mm
2
2-2/0 AWG
2-3/0 AWG
QMP 550A4(R)
2-70mm
2
300mm
2
2-4/0 AWG
2-300kcmil
QMP 700A4(R)
2-185mm
2
3-185mm
2
2-350kcmil
3-250kcmil
WARNING
NOTE
NOTE