16 Digitax ST Installation Guide
www.controltechniques.com Issue: 2
Table 4-1 Fuse ratings and cable sizes
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
• When operating in ambient >45
°
C UL 75
°
C cable should be used.
Cable sizes are given for guidance only and may be changed depending on the
application and the method of installation of the cables.
The mounting and grouping of cables affect their current capacity, in some cases a
larger cable is required to avoid excessive temperature or voltage drop.
Input cable sizes should generally be regarded as a minimum, since they have been
selected for co-ordination with the recommended fuses.
Output cable sizes assume that the maximum motor 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.
The terminals are designed for a maximum cable size of 4.0mm
2
(minimum 26 AWG).
Where more than one cable per terminal is used the combined diameters should not
exceed the maximum.
The terminals are suitable for both solid and stranded wires.
An MCB (miniature circuit breaker) may be used in place of fuses under the following
conditions:
• The fault-clearing capacity must be sufficient for the installation
•The I
2
T rating of the MCB must be less than or equal to that of the fuse rating listed above
Model
No of
input
phases
Typical input
current
A
Maximum
continuous
input current
A
Fuse rating Cable size
IEC
class
gG
Class
CC
Input Output
mm
2
AWG
mm
2
AWG
DST1201 1
3.1 6 10 0.75 16 0.75 24
DST1202 1
6.4 10 10 1 16 0.75 22
DST1203 1
8.6 16 15 2.5 14 0.75 20
DST1204 1
11.8 16 20 2.5 12 0.75 18
DST1201 3 3.1 3.5 6 10 0.75 16 0.75 24
DST1202 3 6.4 7.3 10 10 1 16 0.75 22
DST1203 3 8.6 9.4 16 15 2.5 14 0.75 20
DST1204 3 11.8 13.4 16 20 2.5 12 0.75 18
DST1401 3 2.6 2.8 4 10 0.75 16 0.75 24
DST1402 3 4.2 4.3 6 10 0.75 16 0.75 24
DST1403 3 5.9 6.0 8 10 0.75 16 0.75 22
DST1404 3 7.9 8.0 10 10 1 16 0.75 20
DST1405 3 9.9 9.9 10.0 12 1.5 14 0.75 18
Control cable
≥0.5 20
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