ABB PST User Manual

122 Low Voltage Products & Systems
AC 1006.9 - 5/03 ABB Inc. • 888-385-1221 • www.abb-control.com
Chapter 10 - Functions
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 decreases 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.
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.
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
Step Down 100% 30…100%
Voltage
value to
which the
softstarter
will step
down at stop
and where it
will begin the
stop ramp.
U
30%
100%
t1
t2
I
2
5
1SFC132100F0001
Time
Fixed voltage
Reached set
level of current limit
Time
t1+t2 = set ramp time
Set level
of current limit
Figure 6: Current limit
Figure 5: Step down
voltage for Stop ramp
30%
U
100%
1SFC132099F0001
Example 50%
Stop
Time
Initial voltage 30%
(=end voltage 30%)
Parameter
text
Default
value
Setting
range
Description
Current Lim
4.0 x I
e
2.0… 5.0xI
e
Level of the
current limit

ABB PST Specifications

General

Brand	ABB
Model	PST
Category	Controller
Language	English