Selectable kickstart, Current limit start – Rockwell Automation 150 USE MN/SMC DIALOG + CONTROLLER User Manual

Page 13

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Product Overview

1-3

Selectable Kickstart

This feature provides a boost at startup to break away loads that
require a pulse of high torque to get started. This is intended to
provide a pulse of current that is 550% of full load current. Selectable
kickstart is user-adjustable from 0.0 to 2.0 seconds.

Figure 1.2 Selectable Kickstart

Current Limit Start

This starting mode provides a fixed reduced voltage start; it is used
when limiting maximum starting current is necessary. The Current
Limit level is user-adjustable from 50 to 600% of the motor full load
ampere rating; and the current limit time is user-adjustable from 0 to
30 seconds. If the SMC Dialog Plus controller senses that the motor
has reached the up-to-speed condition during the current limit starting
mode, the output voltage automatically switches to full voltage.

Figure 1.3 Current Limit Start

Kickstart is also available with Current Limit Start.

The Current Limit Start mode design is based on a motor with a locked rotor current rating that is
600% of the full load current rating.

Start Run

Kickstart

Initial

Torque

100%

Percent

Voltage

Time (seconds)

Start

600%

50%

Percent

Full Load

Current

Time (seconds)

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