Product Overview 1-3
1560D-UM051D-EN-P – February 2005
Starting Modes Soft Start
This mode has the most general application. The motor is given an initial
torque setting, which is user-adjustable from 0 to 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 to 30 seconds. Once the MV Dialog
Plus™ controller senses that the motor has reached the up-to-speed condition
during the voltage ramp operation, the output voltage automatically
switches to full voltage, and the bypass contactor is closed.
Percent
Voltage
Initial
Torque
100%
Time (seconds)
Start
Run
Percent
Voltage
Initial
Torque
100%
Time (seconds)
Start
Run
Figure 1.1– Soft Start
Selectable Kickstart X
Selectable kickstart provides a power boost at start-up that is 550% of
full-load current. The additional power helps motors generate higher
torque to overcome the resistive mechanical forces of some applications
when they are started. The selectable kickstart is user-adjustable from 0.0
to 2.0 seconds.
Start Run
Kickstart
Initial
Torque
100%
Percent
Voltage
Time (seconds)
Start Run
Kickstart
Initial
Torque
100%
Percent
Voltage
Time (seconds)
Figure 1.2 – Selectable Kickstart
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