Eaton DS7 - 2 Engineering; 2.1 Selection of devices

2 Engineering
2.1 Selection of devices
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com 33
2 Engineering
2.1 Selection of devices
The DS7 soft starters can be designed for standard motors in standard
applications (such as pumps, fans, conveyor belts etc.) according to the
technical data provided in the Appendix.
A more specific design is required for drives with a high starting torque or
high inertia. The following information must be known for correct device
selection:
• the overload cycle of the machine,
• The start-up time for DOL starting or for star/delta starting,
• the maximum starting current,
• the load cycle,
• the load that the motor is required to drive.
The values of the moments of inertia must also be known for a more precise
design. These values enable you to select the most suitable soft starter.
The relevant procedure is described in the manual MN03902001Z-EN
(“Design of soft soft starters”) and applies generally to all Eaton soft starters.
The necessary key data of the DS7 soft starter series that is also required for
this design (rated operational current, overload capacity, root mean square
current at nominal switching frequency) is provided in the Appendix in the
technical data.
Connecting to a higher-level PLC through SmartWire-DT requires soft
starters with part no. DS7-34D…-D… (hereafter referred to as “DS7-SWD”).
These soft starters can be controlled and monitored via SmartWire-DT, and
their parameters can be configured via SmartWire-DT as well.
￫
In connection with a motor-protective circuit-breaker (PKE),
current can be monitored and additional protective functions can
be activated via SmartWire-DT(￫ chapter 8, “SmartWire-DT”).
￫
The devices in the DS7-34D…-D series can only be used in
conjunction with the SmartWire-DT connection. They cannot be
run via control signal terminals.
By setting the 1-0-A switch to position 1, the corresponding
motor can be started directly in manual mode (￫ chapter 8,
“SmartWire-DT”).