ABB PST72 Installation And Maintenance Manual

10:4 Initial voltage
Path in menu:
Menu/SETTINGS/Functional Settings/
Start/Stop / Init Volt
This parameter makes it possible to set the voltage level where the start ramp begins. If the
initial voltage is set too low, it will cause unneccessary long starting times and unnecessary
heating of the motor.
Parameter text Default value Setting range Description
Init Volt 30% 30...70%
Initial voltage for Start
Ramp
10:5 End voltage
Path in menu:
Menu/SETTINGS/Functional Settings/
Start/Stop / End Volt
This parameter makes it possible to set the voltage level where the stop ramp ends. This
function will be active only if parameter Stop ramp is used.
Parameter text Default value Setting range Description
End Volt 30% 30...70%
Initial voltage for Stop
Ramp
10:6 Step down voltage
Path in menu:
Menu/SETTINGS/Functional Settings/
Start/Stop / Step Down
When stopping a motor using the stop ramp, the speed will not decrease immediately. The
step down voltage function makes it possible to set a level where the motor speed decreas-
es as soon as the stop ramp begins. By using, a more optimized stopping of the motor is
achieved. It is mainly used for pump applications.
Parameter text Default value Setting range Description
Step down 100% 30...100%
Voltage value to which
the softstarter will
step down at stop and
where it will begin the
stop ramp
10:7 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.
Information!
The starting current must be high enough to make it possible for the motor to reach the rated speed. The
lowest possible current depends on the performance of the motor and the characteristics of the load.
Parameter text Default value Setting range Description
Current Lim 4.0 x le 2.0...7xle
Level of the current
limit
Figure 3: Initial voltage for Start Ramp
30%
70%
U
30%
70%
U
100%
Figure 4: End voltage for Stop ramp
Chapter 10
Functions
U
30%
100%
t1 t2
I
2
5
Fixed
voltage
Current limit
setting reached
Time
t1 + t2 = set ramp time
Current limit
setting
Time
Figure 6: Current limit
Figure 5: Step down voltage for Stop ramp
30%
U
100%
Example 50%
Stop
Time
End
voltage
30%
10.4 Low Voltage Products & Systems
1SXU 132 021 M0201 ABB Inc. • 888-385-1221 • www.abb-control.com
10

ABB PST72 Specifications

General

Brand	ABB
Model	PST72
Category	Controller
Language	English