DigitAx User Guide
Issue code: dgxu4
5-8
5.4 AC supply cables and fuses
Warning
The AC supply to the Drive
must be fitted with suitable
protection against overload
and short circuits. The table
shows recommended fuse
ratings. Failure to observe
this recommendation will
cause a risk of fire.
Warning
Wiring must be in
accordance with local
regulations and codes of
practice. The table shows
typical cable sizes for power
input and output wiring. In
the event of a conflict, local
regulations prevail.
The following table is only a guide to cable sizes.
Refer to local wiring regulations for the correct size
of cables.
Model AC supply
cables
Motor cables Fuse
rating
mm
2
AWG mm
2
AWG A
DBE140 2.5 14 1.5 16 10
DBE220 2.5 14 1.5 16 10
DBE420 4.0 10 2.5 14 16
DBE600 4.0 10 4.0 10 16
DBE750 4.0 10 4.0 10 20
DBE1100S 4.0 10 4.0 10 30
DBE1500 10 6 10 8 40
DBE2200 16 4 16 6 60
For the following connections, use 600VAC
(1000V
DC) 3-core pvc-insulated cable with copper
conductors of the size specified in the table:
AC power to the Drive
For the following connections, use 600V
AC
(1000VDC) 3-core pvc-insulated, shielded or
armoured cable with copper conductors of the size
specified in the table:
Drive to the motor
Drive to external braking resistor (if used)
Cable sizes must be selected for 100% of the RMS
currents.
Unusually long cable runs between the Drive and the
motor may give rise to spurious tripping due to the
effect of cable capacitance. As a result, an over-
current fault would be indicated (OC). In this case,
output chokes may be required. In difficult cases,
consult the supplier of the Drive.
The
AC power should be applied through an isolator
and a fuse or circuit-breaker of the specified rating.
Since a current surge can occur when AC power is
applied to the Drive, the use of slow-blow fuses is
recommended. As an alternative to fuses, an
MCB or
MCCB may be used if equipped with adjustable
thermal and magnetic trip devices of a suitable
rating.
5.5 Ground connections
The impedance of the ground circuit must conform
to the requirements of Health and Safety
Regulations that may apply.
The size of external grounding terminals should be
appropriate to the size of the grounding cables.
Ground connections on the power input and power
output connectors are connected together in the
Drive, enabling the following connections to be
made through the Drive:
Motor frame ground to system ground
Motor frame ground to the machine ground
The Drives are suitable for grounded-delta
installation without alteration.
5.6 DC bus choke
For model size 3, connect the specified DC bus
choke to terminals L11 and L12 of the Drive.
An external DC bus choke is not required for model
sizes 1 and 2.
5.7 Protecting the Drive
with line reactors
When a DigitAx is connected to an AC supply which
is subject to severe disturbances, as a result of the
following for example...
• Capacity is at least 200kVA
• Fault current is at least 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
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