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70
Affinity User Guide
www.controltechniques.com Issue Number: 5
A ground fault in the supply has no effect in any case. If the motor must
continue to run with a ground fault in its own circuit then an input
isolating transformer must be provided and if an EMC filter is required it
must be located in the primary circuit.
Unusual hazards can occur on ungrounded supplies with more than one
source, for example on ships. Contact the supplier of the drive for more
information.
Table 4-1 Behavior of the drive in the event of a motor circuit
ground (earth) fault with an IT supply
4.2.2 Supplies requiring line reactors
Input line reactors reduce the risk of damage to the drive resulting from
poor phase balance or severe disturbances on the supply network.
Where line reactors are to be used, reactance values of approximately
2% are recommended. Higher values may be used if necessary, but may
result in a loss of drive output (reduced torque at high speed) because of
the voltage drop.
For all drive ratings, 2% line reactors permit drives to be used with a
supply unbalance of up to 3.5% negative phase sequence (equivalent to
5% voltage imbalance between phases).
Severe disturbances may be caused by the following factors, for example:
•
Power factor correction equipment connected close to the drive.
•
Large DC drives having no or inadequate line reactors connected to
the supply.
•
Across the line (DOL) started motor(s) connected to the supply such
that when any of these motors are started, the voltage dip exceeds
20%.
Such disturbances may cause excessive peak currents to flow in the
input power circuit of the drive. This may cause nuisance tripping, or in
extreme cases, failure of the drive.
Drives of low power rating may also be susceptible to disturbance when
connected to supplies with a high rated capacity.
Line reactors are particularly recommended for use with the following
drive models when one of the above factors exists, or when the supply
capacity exceeds 175kVA:
BA1201 BA1202 BA1203 BA1204
BA1401 BA1402 BA1403 BA1404
Model sizes BA1405 to BA4606 have an internal DC choke and BA5201
to BA6602 have internal AC line chokes, so they do not require AC line
reactors except for cases of excessive phase unbalance or extreme
supply conditions.
When required, each drive must have its own reactor(s). Three individual
reactors or a single three-phase reactor should be used.
Reactor current ratings
The current rating of the line reactors should be as follows:
Continuous current rating:
Not less than the continuous input current rating of the drive
Repetitive peak current rating:
Not less than twice the continuous input current rating of the drive
4.2.3 Input inductor calculation
To calculate the inductance required (at
Y
%), use the following equation:
Where:
I
= drive rated input current (A)
L
= inductance (H)
f
= supply frequency (Hz)
V
= voltage between lines
4.3 Auxiliary power supply
The size 6 E12/54 drive requires an auxiliary 110V or 230V power supply
to feed the internal 24V power supply. The 24V power supply is used to
supply the heatsink fans on the power module.
Figure 4-8 Location of size 6 E12/54 drive 24V power supply
CT part number:
8510-0000
Current rating:
10A
Input voltage:
85 to 123 / 176 to 264Vac auto switching
Cable size:
0.5mm
2
(20AWG)
Supply fuse:
5A slow-blow
Operation with IT (ungrounded) supplies:
Special attention is required when using internal or external
EMC filters with ungrounded supplies, because in the event
of a ground (earth) fault in the motor circuit the drive may not
trip and the filter could be over-stressed. In this case, either
the filter must not be used (removed) or additional
independent motor ground fault protection must be provided.
Refer to Table 4-1.
For instructions on removal, refer to Figure 4-20
internal EMC filter (size 1 to 3)
internal EMC filter (sizes 4 to 6)
For details of ground fault protection contact the supplier of
the drive.
Drive size
Internal filter only
External filter (with internal)
1 and 2
Drive trips on fault
Drive trips on fault
3
May not trip – precautions
required
Drive trips on fault
4 to 6
May not trip – precautions
required
May not trip – precautions
required
WARNING
L
Y
100
----------
V
3
-------
×
1
2
π
f
I
------------
×
=
Internal
wiring
User wiring
from a 5A
fused supply
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