Eaton DS7 Series, Manual

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1 Device series DS7
1.14 Function
26
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
1.14 Function
DS7 soft starters use phase control for controlling the voltage of the supply
network smoothly from an adjustable start value up to 100 % of the rated
value U
LN
. This voltage control enables the inrush current of a three-phase
asynchronous motor to be limited and its starting torque to be considerably
reduced. This enables a smooth and jerk-free increase in torque, adjusted to
the load behavior of the machine.
Figure 10: Function chart
a Mains supply voltage U
LN
3 × 200 V bis 3 × 480 V
b Antiparallel thyristors in two phases with bypass contact for controlling the motor voltage
c Output voltage U
2
: three-phase, from an adjustable start voltage to 100% mains voltage with the use of a
ramp function at a constant line frequency
Output current I
2N
: 4 - 200 A at a maximum ambient air temperature of +40 °C
Rated motor shaft output P
2
: 1.5 - 110 kW with 400 or 3 - 150 HP with 480 V
d
Controller card for controlling the power section
This is used to initiate control commands and set the parameters.
e SmartWire-DT interface (optional) for configuring parameters and for control and monitoring
￫
The following limitations apply to single-phase AC motors:
①
U
LN
: 1 x 200 - 240 V
③
Output current I
2N
: 4 - 32 A
Rated motor shaft output P
2
with 230 V: 0.37 - 4 kW or 1/3 - 5 HP
①
②
③
④
⑤
M
3 ∼