Unidrive M Modular Installation Guide
59
Issue Number: 2
6.2 AC supply requirements
Voltage:
200 V drive: 200 V to 240 V ±10%
400 V drive: 380 V to 480 V ±10%
575 V drive: 500V to 575 V ±10%
690 V drive: 500 V to 690 V ±10%
Number of phases: 3
Maximum supply imbalance: 2 % negative phase sequence (equivalent
to 3% voltage imbalance between phases).
Frequency range: 48 to 62 Hz
The maximum supply symmetrical fault current must be limited to 100 kA
(also required for UL compliance).
6.2.1 Supply types
Drives rated for supply voltage up to 575 V are suitable for use with any
supply type, i.e. TN-S, TN-C-S, TT, IT, with grounding at any potential,
i.e. neutral, centre or corner ("grounded-delta").
Grounded delta supplies >575 V are not permitted.
Drives are suitable for use on supplies of installation category III and
lower, according to IEC60664-1. This means they may be connected
permanently to the supply at its origin in a building, but for outdoor
installation additional over-voltage suppression (transient voltage surge
suppression) must be provided to reduce category IV to category III.
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 6-1 Behavior of the drive in the event of a ground (earth)
fault with an IT supply
6.2.2 Input line reactor specifications
Figure 6-8 Input line reactor/output sharing choke dimensions
Table 6-2 400 V input line reactor ratings
Table 6-3 690 V input line reactor ratings
6.2.3 Supplies requiring additional line reactance
Additional line reactance reduces the risk of damage to the drive resulting
from poor phase balance or severe disturbances on the supply network. It
also reduces harmonic current emission.
Where additional line reactance is to be used, added reactance of
approximately 2 % is 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 % additional reactance permits 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.
•
Direct-on-line 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.
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
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 6-1. For details of ground fault protection
contact the supplier of the drive.
WARNING
Drive
size
Internal filter only
External filter (with
internal)
(All
sizes)
May not trip – precautions
required:
•
Remove the EMC filter
•
Use ground leakage
relay
May not trip – precautions
required:
•
Do not use EMC filter
•
Use ground leakage
relay
A separate input line reactor of at least the value shown in
Table 6-2 to Table 6-3 must be used with the Rectifiers.
Failure to provide sufficient reactance could damage or
reduce the service life of the rectifier or inverter.
CAUTION
H
W
D
Model
Current
A
Inductance
μ
H
Overall
width (W)
mm
Overall
depth (D)
mm
Overall
height (H)
mm
Weight
kg
Max
ambient
temp (°C)
Min
airflow
(m/s)
Quantity
required
Part No.
INL 401
245
63
240
190
225
32
50
1
1
4401-0181
INL 402
370
44
276
200
225
36
50
1
1
4401-0182
Model
Current
A
Inductance
μ
H
Overall
width (W)
mm
Overall
depth (D)
mm
Overall
height (H)
mm
Weight
kg
Max
ambient
temp (°C)
Min
airflow
(m/s)
Quantity
required
Part No.
INL 601
145
178
240
190
225
33
50
1
1
4401-0183
INL 602
192
133
276
200
225
36
50
1
1
4401-0184
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