Eaton Industrial Switchgear - xStart switching, protections and actuating motors

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2010 CA08103002Z-EN
9/6 DS6 soft starters
Description
L1 L2 L3
T1 T2 T3
Application
The DS6 series soft starters are
intended for three-phase motors with
normal operating frequency and a
rating range of 22 to 110 kW.
A significant reduction of the inrush
current for three-phase lamps and
heaters (with an ungrounded star
point) is achieved by setting a short
soft start ramp time (at least 1 s).
The special actuation method
(asymmetrical trigger phase control)
for the soft start function avoids the DC
components that would normally
occur in two-phase-controlled soft
starters. This suppresses the
generation of an elliptical rotating
field, which would cause uneven
motor starting and increase the
motor's acceleration phase. The true
run behavior of the DS6 is therefore
comparable with that of a three-
phase-controlled soft starter.
Features
The soft starter DS6-340-MX is
available with a rating of 22 to 110 kW.
Starting transients and DC
components during startup are
effectively suppressed and guarantee
even motor starting.
The ramp times and the start voltage
are adjustable via potentiometers. The
time can be adjusted between 1 and
30 s (start) and between 0 and 30 s
(stop); the start voltage (i.e. the
starting torque) from 30 to 100 %mains
voltage.
The DS6-340-MX models feature
built-in bypass contacts that close
automatically at TOR (top-of-ramp)
and bypass the built-in thyristors. This
function provides radio interference
level “B” in continuous operation
without additional measures.
Typical applications
for soft starters
• Pump drives: Soft starting prevents
sudden pressure surges. The
mechanical load on the whole plant
is reduced and its service life
increases.
• Fan drives: Soft starting prevents
drive belt slippage and premature
wear. This reduces operating costs
and extends durability.
• Conveyors: The conveyor belt starts
up gently instead of with a jerk. The
conveyed goods do not fall over, the
mechanical stress on the conveyor
is reduced and its lifespan
increased.
Documentation
Installation instructions
AWA8250-2330
Manual
AWB8250-1346
("Design of soft starters")
Notes:
See also Engineering of DS7 Settings
for Potentiometer
DS6