*
M’Ax Installation Guide
3
Issue Number: 6
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An MCB or MCCB having the correct thermal and magnetic trip ratings
may be used in place of fuses, on condition the fault-current clearing
capacity is sufficient for the installation.
UL listing is dependent on the use of the correct type of UL-listed
fuse, and applies when the symmetrical short-circuit current does
not exceed 5kA. Refer to Appendix A UL Listing Information.
Table 2-3
Fuse ratings
2.4
AC supply disturbances - use of line
reactors
When a drive is connected to an AC supply which is subject to severe
disturbances - for example, if any of the following conditions apply...
•
Capacity exceeds 200kVA
•
Fault current exceeds 5kA
•
Power-factor correction equipment is connected close to the drive
•
Large DC drives having no or ineffective line reactors are connected
to the supply
•
Direct-on-line started motor(s) are connected to the supply and,
when any of these motors are started, a dip is produced in excess of
20% of the actual supply voltage
... excessive peak current may flow in the input power circuit of the drive.
This may cause nuisance tripping or, in extreme cases, failure of the
drive.
A line reactor should then be connected in each phase of the supply to
each drive. Line reactor(s) add the required impedance to the AC supply
in order to reduce current transients to a level that can be tolerated by
the drive.
Three individual reactors, or a single three-phase reactor should be
used. Each drive must have its own reactor(s).
RFI filters (for EMC purposes) do not give adequate
protection against these conditions.
Table 2-4
Typical line-reactor values
Current ratings
Continuous rms: Not less than the continuous input current rating of
the drive
Repetitive max rms:Not less than 4 x continuous input current rating of
the drive (to avoid magnetic saturation)
2.5
Power cables
Wiring must be in accordance with local regulations and
codes of practice. The table below shows typical PVC
cable sizes for power input and output wiring. In the
event of a conflict, local regulations prevail.
The cable sizes recommended in Table 2-5 are in accordance with
EN60204-1; installation method: B2 - one loaded cable in conduit or
trunking attached to a wall.
Table 2-5
Power cable sizes, metric
The cable sizes recommended in Table 2-6 are in accordance with
UL508C; installation method: one loaded three phase cable in conduit
Table 2-6
Power cable sizes, imperial
This assumes the motor maximum current matches that of the
drive. Where a motor of reduced rating is used, the cable rating
may be chosen to match that of the motor. To ensure that the motor
and cable are protected against over-load, the drive must be
programmed with the correct motor rated current.
Ground conductors
A ground conductor can be included in the motor and braking resistor
cables, or a separate wire external to these cables can be used.
Motor cable
Most cables have an insulating jacket between the cores and the armour
or shield; these cables have a low capacitance. When using a cable of
this type, observe the recommended maximum lengths stated in
Table 2-7 .
Table 2-7
Maximum cable lengths
* Cable lengths in excess of the specified values may be used only when
special techniques are adopted; refer to the supplier of the drive.
Cable capacitance
High-capacitance cables tend not to have an insulating jacket between
the cores and the shield or armour. If a cable of this type is used, the
maximum cable length is half the figure quoted in Table 2-7 .
For identification, see Figure 2-1.
Model
Fuse rating
M’Ax 403
10A
M’Ax 406
15A
M’Ax 409
20A
M’Ax 412
20A
Model
Value
Part no
M’Ax 403
2mH
4402-0227
M’Ax 406
2mH
4402-0227
M’Ax 409
1mH
4402-0228
M’Ax 412
1mH
4402-0228
NOTE
CAUTION
Model
Cable size
Input cable
Output cable
M’Ax 403
1.5mm
2
1.0mm
2
M’Ax 406
2.5mm
2
1.0mm
2
M’Ax 409
4.0mm
2
1.5mm
2
M’Ax 412
4.0mm
2
2.5mm
2
Model
Cable size
Input cable
Output cable
M’Ax 403
16 AWG
18 AWG
M’Ax 406
14 AWG
16 AWG
M’Ax 409
12 AWG
14 AWG
M’Ax 412
12 AWG
14 AWG
Model
Maximum cable length *
m
ft
M’Ax 403
50
165
M’Ax 406
50
165
M’Ax 409
50
165
M’Ax 412
50
165
WARNING
NOTE
