Functions
Chapter 10
132
1SFC132003M0201
10:2 Start mode
Path in menu:
Menu/SETTINGS/Functional Settings/
Torque control/ Start Mode
Using the PST softstarter it is possible to choose between
two different types of start ramps. These are voltage ramp
and torque ramp.
Voltage ramp
When using the voltage ramp, the voltage
is increased linearly from the start level to
full voltage during start. Since the torque
depends on both the voltage and the
current, the torque curve does not always
follow the voltage curve. This has the
effect that the torque curve will not
increase or decrease linearly.
Torque ramp
When using the torque ramp, the output
voltage to the motor is controlled so that
the torque will follow a predefined optimal
curve from the start level to full voltage
during start. This has the benefit that the
mechanical starting behavior of the
equipment driven by the motor will be
much softer than when using voltage
ramp.
1SFC132160F0001
U
rpm
Time
Start
Time
Start
Figure 1: Voltage ramp
U
rpm
1SFC132161F0001
Time
Start
Time
Start
Figure 2: Torque ramp
Parameter
text
Default value Setting range
Description
Start Mode Volt
Volt, Torque
Type of start
ramp
Summary of Contents for PST105
Page 2: ...This manual belongs to ...
Page 4: ......
Page 8: ...Chapter 8 1SFC132003M0201 Notes ...
Page 10: ...Introduction 10 1SFC132003M0201 ...
Page 14: ...Introduction Chapter 1 14 1SFC132003M0201 ...
Page 16: ...Quickstart 16 1SFC132003M0201 ...
Page 20: ...Description 20 1SFC132003M0201 ...
Page 34: ...Description Chapter 3 34 1SFC132003M0201 ...
Page 36: ...Mounting 36 1SFC132003M0201 ...
Page 40: ...Mounting Chapter 4 40 1SFC132003M0201 ...
Page 42: ...Connection 42 1SFC132003M0201 ...
Page 60: ...Connection Chapter 5 60 1SFC132003M0201 ...
Page 62: ...Human Machine Interface HMI 62 1SFC132003M0201 ...
Page 74: ...Human Machine Interface HMI Chapter 6 74 1SFC132003M0201 ...
Page 76: ...Setting and configuration 76 1SFC132003M0201 ...
Page 120: ...Fieldbus communication option 120 1SFC132003M0201 ...
Page 124: ...Maintenance 124 1SFC132003M0201 ...
Page 126: ...Maintenance Chapter 9 126 1SFC132003M0201 ...
Page 130: ...Chapter 130 1SFC132003M0201 ...
Page 178: ...Trouble shooting 178 1SFC132003M0201 ...
Page 188: ...Trouble shooting Chapter 11 188 1SFC132003M0201 ...
Page 190: ...Diagrams 190 1SFC132003M0201 ...
Page 199: ......