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Digitax ST User Guide 177
Issue Number: 5
13.1.6 Maximum power ratings
For the models shown, the protection systems limit the output rating of
the drive.
The ratings are based on the following operating conditions:
• Ambient temperature = 40 °C
• Altitude = 1000 m
Table 13-11 Maximum rectifier power, ≤230 Vac supply for
DST120X and ≤400 Vac supply for DST140X
Table 13-12 Maximum rectifier power, ≤240 Vac supply for
DST120X and ≤480 Vac supply for DST140X
13.1.7 Power dissipation
Table 13-13 Maximum drive losses
13.1.8 Supply requirements
Table 13-14 Supply requirements
*Maximum supply in-balance: 2 % negative phase sequence (equivalent
to 3 % voltage in-balance between phases).
Frequency range: 48 to 65 Hz
For UL compliance only, the maximum supply symmetrical fault current
must be limited to 100 kA
13.1.9 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 imbalance 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
Continuous current:
Not less than the continuous input current rating of the drive.
Repetitive peak current:
Not less than three times the continuous input current rating of the drive.
Model
No. of Input
phases
Power at supply voltage
Without line
reactor
With line reactor
kW kW
DST1201 1 0.329
DST1202 1 0.714
DST1203 1 0.864
DST1204 1 1.391
DST1201 3 0.51
DST1202 3 1.13
DST1203 3 1.61
DST1204 3 1.77 1.98
DST1401 3 0.77
DST1402 3 1.36
DST1403 3 2.04
DST1404 3 2.93 2.99
DST1405 3 2.77 3.05
Model
No. of Input
phases
Power at supply voltage
Without line
reactor
With line reactor
kW kW
DST1201 1 0.394
DST1202 1 0.857
DST1203 1 1.03
DST1204 1 1.66
DST1201 3 0.609
DST1202 3 1.35
DST1203 3 1.92
DST1204 3 2.12 2.38
DST1401 3 0.924
DST1402 3 1.63
DST1403 3 2.44
DST1404 3 3.51 3.58
DST1405 3 3.32 3.65
Model
6 kHz 8 kHz 12 kHz
WWW
DST1201 64 65 69
DST1202 79 82 88
DST1203 102 109 122
DST1204 107 110 118
DST1401 79 87 101
DST1402 77 81 90
DST1403 124 142 177
DST1404 127 143 175
DST1405 150 169 207
Model Voltage
Frequency
range
DST120X 200 V to 240 V ±10 % single phase 48 Hz to 65 Hz
DST120X 200 V to 240 V ±10 % three phase* 48 Hz to 65 Hz
DST140X 380 V to 480 V ±10 % three phase* 48 Hz to 65 Hz
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