Current Limit - ABB PSE 18 Installation And Commissioning Manual

Figure 7.12: Current Limit parameter displayed
U
100%
30%
t1
I
5
2
Figure 7.13: The relation between the Current Limit , the cur-
rent I to the motor, and the output voltage U

7.5.5 Current Limit

It is possible to limit the starting current by using this function. The limit can not
be exceeded during start and stop ramp. When the Current Limit is reached, the
output voltage stays stable until the current level falls below the limit, then the
ramping continues.
The relation between Current Limit, the current I to the motor and the output volt-
age is described in figure 7.13.
The starting current must be high enough to make it possible for the mo-
tor to reach the rated speed. The lowest possible current depends on the
performance of the motor and the characteristics of the load. If the Current
Limit is set too low, it will cause longer starting time and unnecessary heat-
ing of the motor.
Display
t2
Current limmit
Softstarters Type PSE18...PSE370 Installation and commissioning manual 1SFC132057M0201
Default Setting
value range
4 x I e 7...1.5 x I e
Description
Level of Current Limit in relation to
output voltage.
Chapter 7 63