Rockwell Automation Allen-Bradley SMC-Flex 150 - Operation; Modes of Operation (Standard); Soft Start

1-2 Product Overview
Operation The SMC-Flex controller can operate three-phase squirrel-cage
motors rated 1…480 A or wye-delta motors rated 1.8…831 A;
200…480V AC or 200…600V AC; 50/60 Hz. Depending upon the
catalog number ordered, the controller will accept a control power
input of either 100…240V AC or 24V AC/DC. If the control power
input option is 100…240V AC, the controller’s microprocessor will
self-adjust to the input control voltage.
Note that the motor FLA must fall within the range of the SMC-Flex
as specified in the selection guide for proper operation.
Modes of Operation (Standard) Soft Start
①
This mode has the most general application. The motor is given an
initial torque setting, which is user-adjustable from 0…90% of locked
rotor torque. From the initial torque level, the output voltage to the
motor is steplessly increased during the acceleration ramp time. The
acceleration ramp time is user-adjustable from 0…30 seconds. If the
SMC-Flex controller senses that the motor has reached the up-to-
speed condition during the voltage ramp operation, the internal
bypass contactor will be pulled in.
Figure 1.1 Soft Start
➀ Kickstart is also available with Soft Start.
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