Function - Eaton DS7 Manual

1 Device series DS7

1.14 Function

1.14 Function
26
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
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 . This voltage control enables the inrush current of a three-phase
LN
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.
②
① ③
④
⑤
Figure 10: Function chart
a Mains supply voltage U
3 × 200 V bis 3 × 480 V
LN
b Antiparallel thyristors in two phases with bypass contact for controlling the motor voltage
c Output voltage U
: three-phase, from an adjustable start voltage to 100% mains voltage with the use of a
2
ramp function at a constant line frequency
Output current I : 4 - 200 A at a maximum ambient air temperature of +40 °C
2N
Rated motor shaft output P
2
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:
U : 1 x 200 - 240 V
①
LN
Output current I
③
Rated motor shaft output P
M
3 ∼
: 1.5 - 110 kW with 400 or 3 - 150 HP with 480 V
: 4 - 32 A
2N
with 230 V: 0.37 - 4 kW or 1/3 - 5 HP
2