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6.5.1.1
Output reactor
The output reactor is especially used to limit additional current spikes caused by the cable capacitances when
long cables are used, i.e. it
♦ reduces the charge current spikes for long cables
♦ reduces the voltage rate-of-change dv/dt at the motor terminals.
It does not reduce the magnitude of the transient voltage spikes at the motor terminals.
In order that the reactor temperature rise remains within the specified limits, the pulse frequency f
converter, rated motor frequency f
the specified limits:
Standard reactor (iron) f
V/f / Vector control
V/f textile
≤ 6 kHz
Ferrite reactor f
P
V/f / Vector control
V/f textile
Table 6.9
Output reactor design
600
500
400
300
200
100
1
10
Fig. 6.4
Permissible cable lengths with and without output reactors
The specified lengths are valid for unshielded cables; for shielded cables, these values must be reduced to 2/3.
If several motors are connected to a drive converter, the sum of the cables lengths of all the motor feeder
cables must be less than the permissible cable length.
6-6
and the maximum drive converter output frequency f
mot N
V/f = constant
510 V
to 620 V DC
≤ 3 kHz
P
≤ 87 Hz
f
mot N
≤ 120 Hz
f
= f
mot N
max
≤ 150 Hz
f
mot N
≤ 600 Hz
f
= f
mot N
max
2 output reactorss
(not permissible for ferrite reactors)
1 output reactor
without output reactor
100
1000
Drive converter outputs / kW
675 V
to 930 V DC
≤ 200 Hz f
f
mot N
max
not possible
not possible
f
max
not possible
NOTE
SIMOVERT MASTER DRIVES
p
must lie within
max
V = constant
510 V
to 620 V DC
≤ 200 Hz
f
max
not possible
≤ 300 Hz
Siemens AG
Operating Instructions
08.96
of the drive
675 V
to 930 V DC
≤ 300 Hz
6SE7087-6BM70
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