Effective May 2011
Instructional Lea et IL03901003E
DS7 series soft start controllers,
Frame 1 (4–12A)
Introduction
The Eaton DS7 solid-state soft start controller is
an electronic, self-contained panel- or enclosure-
mounted motor soft-starting device. It provides
three-phase induction motors with a smooth start,
both mechanically and electrically. The DS7 line
uses four silicon-controlled rectifiers (SCRs) that
are connected in a full wave-power bridge on two
phases. The voltage and current applied to the
motor are controlled by varying the SCR conduc-
tion period. This, in turn, controls the torque devel-
oped by the motor. After the motor reaches speed,
a bypass relay is energized to bypass the SCRs.
The DS7 is designed to fulfill the industrial service
requirements of applications such as chiller start-
ers, pump panels, and machine tools. This device
meets all relevant specifications set forth by UL姞
508, IEC 60947-4-2, CE, C-Tick, and CSA姞.
This leaflet covers basic installation and setup. No
publication can take into account every possible
situation. If you require further assistance with any
aspect of this product or a particular application,
contact Eaton.
Inspection
General
Upon receipt of the unit, verify that the catalog
number and unit options stated on the shipping
container match those stated on the order/
purchase form.
Inspect the equipment upon delivery. Report any
carton damage to the carrier prior to accepting the
delivery. Have this information noted on the freight
bill. Eaton is not responsible for damage incurred
in shipping.
Unpacking
Remove all packing material from the unit. Be
sure to remove all packing material from the
lug location.
Check the unit for any signs of shipping damage.
If damage to the product is found after unpacking,
report it to the freight company. Retain the packing
materials for the carrier to review.
Verify that the unit’s catalog number and options
match those stated on the order/purchase form.
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