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Unidrive M / Unidrive HS Modular Installation Guide
Issue Number: 5
Table 6-4 690 V input line reactor ratings
* With forced cooling (40°C with natural cooling)
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
6.2.4 Additional input inductance calculation
To calculate the additional 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
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
202
133
276
200
225
36
50
1
1
4401-0184
INL 603
331
93
300
216
264
58
50*
0
1
4401-0261
L
Y
100
----------
V
3
-------
×
1
2
π
f
I
------------
×
=
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