Ip Rating Degrees Of Protection; Protection; Nema Enclosure Ratings; Ac Supply Fusing - Emerson SP1201 Installation Manual

Safety Product
Introduction
Information information
Table 10-14 IP Rating degrees of protection
First digit
Protection against contact and
ingress of foreign bodies
0 No protection
Protection against large
foreign bodies φ > 50mm
1
(large area contact with the
hand)
Protection against medium
size foreign bodies φ > 12mm
2
(finger)
Protection against small
foreign bodies φ > 2.5mm
3
(tools, wires)
Protection against granular
foreign bodies φ > 1mm (tools,
4
wires)
Protection against dust
5 deposit, complete protection
against accidental contact.
Protection against dust
6 ingress, complete protection
against accidental contact.
7 -
8 -
Table 10-15 NEMA enclosure ratings
NEMA rating
Enclosures are intended for indoor use, primarily
to provide a degree of protection against contact
Type 1
with the enclosed equipment or locations where
unusual service conditions do not exist.
Enclosures are intended for indoor use, primarily
Type 12 to provide a degree of protection against dust,
falling dirt and dripping non-corrosive liquids.
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 SP regen brake resistor replacement
4. Regen systems using an SPMC
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 SPMC rectifier
module. For further information on the fusing required for the above
systems refer to section 4 System design on page 30.
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.
192
System Mechanical Electrical
design installation installation
Second digit
Protection against ingress of water
0 No protection
1 -
2 -
Protection against spraywater
3
(up to 60° from the vertical)
Protection against splashwater
4
(from all directions)
Protection against heavy
5 splash water (from all
directions, at high pressure)
Protection against deckwater
6
(e.g. in heavy seas)
7 Protection against immersion
8 Protection against submersion
Description
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Getting
Optimisation Parameters
started
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 10-16
Table 10-16 Supply fault current used to calculate maximum input
currents
Model Symmetrical fault level (kA)
All
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.
NOTE
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.
NOTE
UL listing is dependent on the use of the correct type of UL-listed fuse,
and applies when symmetrical short-circuit current does not exceed 5kA
for sizes 1 to 3.
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.
WARNING
A fuse or other protection must be included in all live connections to the
AC supply.
An MCB (miniature circuit breaker) or MCCB (moulded-case
circuitbreaker) with type C may be used in place of fuses on Unidrive SP
sizes 1 to 3 under the following conditions:
• The fault-clearing capacity must be sufficient for the installation
• For frame sizes 2 and 3, the drive must be mounted in an enclosure
which meets the requirements for a fire enclosure.
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 10-17 Supply fault current used to calculate maximum input
currents
Model
SPMA
SPMD
SPMC
N
NOTE
Fuse ratings are for a DC supply or paralleled DC bus arrangements.
When supplied by a single or dual SPMC of the correct rating, the AC
input fuses provide protection for the drive and no DC fuse is required.
Technical Component
data sizing
100
Symmetrical fault level (kA)
100
Unidrive SP Regen Installation Guide
Issue Number: 2
Diagnostics