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Unidrive M Regen Design Guide 287
Issue Number: 4
Table 10-9 IP Rating degrees of protection
Table 10-10 UL enclosure ratings
10.3 Protection
Fuse protection is required in the following Regen systems
1. Single Regen, multiple motoring drives
2. Multiple Regen, multiple motoring drives
3. Unidrive M Regen brake resistor replacement
4. Regen systems using a rectifier
Fuse protection required could range from AC supply fusing to DC bus
fusing (some systems requiring both AC and DC fusing) for protection of
both the Regen and motoring drives along with the Unidrive M rectifier
module. For further information on the fusing required for the above
systems refer to section 4 System design on page 40.
10.3.1 AC Supply fusing
The input current is affected by the supply voltage and impedance.
Typical input current
The values of typical input current are given to aid calculations for power
flow and power loss. The values of typical input current are stated for a
balanced supply.
Maximum continuous input current
The values of maximum continuous input current are given to aid the
selection of cables and fuses. These values are stated for the worst case
condition with the unusual combination of stiff supply with bad balance.
The value stated for the maximum continuous input current would only
be seen in one of the input phases. The current in the other two phases
would be significantly lower.
The values of maximum input current are stated for a supply with a 2 %
negative phase-sequence imbalance and rated at the supply fault
current given in Table 10-11
Table 10-11 Supply fault current used to calculate maximum input
currents
Cable sizes are from IEC60364-5-52:2001 table A.52.C with correction
factor for 40 °C ambient of 0.87 (from table A52.14) for cable installation
method B2 (multicore cable in conduit). Cable size may be reduced if a
different installation method is used, or if the ambient temperature is
lower. The recommended cable sizes above are only a guide.
The mounting and grouping of cables affects their current-carrying
capacity, in some cases smaller cables may be acceptable but in other
cases a larger cable is required to avoid excessive temperature or
voltage drop.
Refer to local wiring regulations for the correct size of cables.
The recommended output cable sizes assume that 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 overload, the
drive must be programmed with the correct motor rated current.
UL listing is dependent on the use of the correct type of UL-listed fuse.
A fuse or other protection must be included in all live connections to the
AC supply.
Fuse types
The fuse voltage rating must be suitable for the drive supply voltage.
Ground connections
The drive must be connected to the system ground of the AC supply.
The ground wiring must conform to local regulations and codes of
practice.
Table 10-12 Supply fault current used to calculate maximum input
currents
N
Fuse ratings are for a DC supply or paralleled DC bus arrangements.
First digit Second digit
Protection against contact and
ingress of foreign bodies
Protection against ingress of water
0 No protection 0 No protection
1
Protection against large
foreign bodies > 50 mm
(large area contact with the
hand)
1
Protection against vertically falling
drops of water
2
Protection against medium
size foreign bodies
> 12 mm (finger)
2
Protection against spraywater (up to
15° from the vertical)
3
Protection against small
foreign bodies > 2.5 mm
(tools, wires)
3
Protection against spraywater (up to
60° from the vertical)
4
Protection against granular
foreign bodies > 1 mm
(tools, wires)
4
Protection against splashwater (from
all directions)
5
Protection against dust
deposit, complete protection
against accidental contact.
5
Protection against heavy splash
water (from all directions, at high
pressure)
6
Protection against dust
ingress, complete protection
against accidental contact.
6
Protection against deckwater (e.g. in
heavy seas)
7 - 7 Protection against immersion
8 - 8 Protection against submersion
UL rating Description
Type 1
Enclosures are intended for indoor use, primarily
to provide a degree of protection against limited
amounts of falling dirt.
Type 12
Enclosures are intended for indoor use, primarily
to provide a degree of protection against dust,
falling dirt and dripping non-corrosive liquids.
Model Symmetrical fault level (kA)
All 100
Fuses
The AC supply to the drive must be fitted with suitable
protection against overload and short-circuits. Failure to
observe this requirement will cause risk of fire.
Model Symmetrical fault level (kA)
Unidrive M Rectifier 100
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