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UL Listing
Information
Unidrive SPM User Guide
75
Issue Number: 3 www.controltechniques.com
Table 6-18 Unidrive SPMC/U 690V input current, fuse and cable size ratings
N
The cable sizes noted in Table 6-15, Table 6-16, Table 6-17 and Table 6-
18 are typical cable sizes based on UL508C and IEC60364-5-52:2001.
Maximum cable sizes are 2 x 240mm
2
or 2 x 400kcmil per pole. The
user will have to decide what size of cable to use in any given application
based on the local wiring regulations. Use of high temperature cables
that are thinner than those stated in the typical cable chart maybe
possible, contact the supplier of the drive for advice.
Installation method (ref:IEC60364-5-52:2001)
B1 - Separate cables in conduit
B2 - Multicore cable in conduit
C - Multicore cable in free air
N
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.
N
Owing to the high level of current on the input of SPMD1404 and the
output of SPMC1402 and SPMU1402, the cable installation method
must be B1 or C rather than B2 if the ambient is 40
°
C. Installation
method B1 is separate cables in conduit and installation method C is
multicore cable in free air.
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.
N
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 over-load, the
drive must be programmed with the correct motor rated current.
N
UL listing is dependent on the use of the correct type of UL-listed fuse.
See Chapter 16
UL Listing Information
on page 294 for sizing
information.
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.
IEC Fuse types
•
IEC class gG - Full range breaking capability in general application.
Slow acting.
•
IEC class gR - Dual rated: semiconductor protection (ultra-fast
acting) and cable protection.
•
IEC class aR - Semiconductor Protection, fast acting. Provides no
protection from slow, small overloads, so cable must be protected by
using a gG fuse or circuit breaker.
•
HRC-
H
igh
R
upturing
C
apacity – Denotes the ability of the fuse link
to interrupt extremely high fault currents.
North American Fuse Types
•
UL class J - Full range breaking capability in general application.
Slow acting. Up to 600V only.
•
Ferraz HSJ -High speed class J fuses. Dual rated: semiconductor
protection (ultra-fast acting) and cable protection. Up to 600V only
and only from Ferraz.
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.
6.9.1 Main AC supply contactor
The recommended AC supply contactor type is AC1.
6.10 Output circuit and motor protection
The output circuit has fast-acting electronic short-circuit protection which
limits the fault current to typically no more than five times the rated
output current, and interrupts the current in approximately 20µs. No
additional short-circuit protection devices are required.
The drive provides overload protection for the motor and its cable. For
this to be effective, Pr
0.46
Motor rated current
must be set to suit the
motor.
There is also provision for the use of a motor thermistor to prevent over-
heating of the motor, e.g. due to loss of cooling.
6.10.1 Cable types and lengths
Since capacitance in the motor cable causes loading on the output of the
drive, ensure the cable length does not exceed the values given in Table
6-19 and Table 6-20.
Use 105
°
C (221
°
F) (UL 60/75
°
C temp rise) PVC-insulated cable with
copper conductors having a suitable voltage rating, for the following
power connections:
•
AC supply to external EMC filter (when used)
•
AC supply (or external EMC filter) to drive
•
Drive to motor
•
Drive to braking resistor
Model
Maximum
input
current
Typical
DC
output
current
Semiconductor fuse in
series with HRC fuse
Typical cable size
HRC IEC
Class gG UL
class J
Semi-
conductor
IEC class aR
AC input
DC output cable
Cable
installation
method
A
A
A
A
mm
2
AWG
mm
2
AWG
SPMC/U1601
195
209
250
250
2 x 70
2 x 2/0
2 x 120
2 x 4/0
B2
SPMC/U2602
2 x 173
2 x 185
250
250
2 x 70
2 x 2/0
2 x 120
2 x 4/0
B2
Fuses
The AC supply to the drive must be installed with suitable
protection against overload and short-circuits. Table 6-15, Table
6-16, Table 6-17 and Table 6-18 show recommended fuse
ratings. Failure to observe this requirement will cause risk of
fire.
NOTE
NOTE
NOTE
NOTE
NOTE
WARNING
Pr
0.46
Motor rated current
must be set correctly to avoid a
risk of fire in the event of motor overload.
WARNING
