Current Limit; Torque Limit - ABB PST30 Installation And Commissioning Manual

U
100%
Fixed F
Fixed voltage
Reached set level
of current limit
30%
t1
t1+t2 = set ramp time
I
5
2
Figure 10: Current limit
Nm
Available torque/
Torque during DOL start
Torque
limit
Torque limit reached
Figure 11: Torque limit
1SFC132003M0201

10:10 Current limit

Path in menu:
Menu/SETTINGS/Functional Settings/
Start/Stop / Current Lim
It is possible to limit the starting current by using this function.
When the current limit is reached, the output voltage stays
stable until the current level falls below the limit, then the
ramping continues.
Time
t2
The starting current must be high enough to make it possible
Set level of
for the motor to reach the rated speed. The lowest possible
current limit
current depends on the performance of the motor and the
characteristics of the load.
Time
Parameter
text
Current Lim 4.0 x I

10:11 Torque limit

Path in menu:
Menu/SETTINGS/Functional Settings/
Torque control / Torque Limit
It is possible to limit the starting torque by setting this
parameter. When the torque limit is reached, the output
voltage stays stable until the torque falls below the limit, then
the ramping continues.
Time
Torque limit is only available when start mode is set to
torque.
Parameter
text
Torque
Limit
Default value Setting range Description
2.0...7.0x I
e
Default value Setting range
150 % 20...200%
Chapter 10
Functions
Level of the
e
current limit
Description
Level of the
torque limit
compared to
the nominal
torque of the
motor
137