Speed controller RA-SP
01/08 AWB2190-1430GB
134
F-24 Current limit (OLOAD)
With the current limit setting, the motor current can be limited. To
reduce the load current, the frequency rise ends in the acceleration
phase or the output frequency is reduced in the static phase, as
soon as the output current exceeds the set current limit. The time
constant for control at the current limit is entered under PNU b23.
As soon as the output current drops below the set current limit, the
frequency increases again to the configured reference value. To
allow higher currents to flow for a brief period, the current limit
can be switched off for the acceleration phase (
a
PNU b21).
Figure 127: Current limit
I
M
: Motor current
I
1
: Current limit
h
Caution!
Note that the current limit cannot prevent a fault message
and shutdown due to a sudden overcurrent (e.g. caused
by a short-circuit).
PNU b22
I
1
f
I
t
I
M
PNU
Designation
Adjustable in
RUN mode
Value
Function
FS
b21
Motor current
limitation
–
00 = OFF
Motor current limit not active
01
01 = ON
Motor current limit active in all operating states
02 = CRT
Motor current limit not active during acceleration
b22
Tripping
current
–
on
Setting range of the tripping current as a multiple of the RA-SP’s
rated current, i.e. the range is given in amperes (A).
1)
b23
Time constant
–
0,1 to 30 Hz/s
When specified current limit is reached, the frequency is reduced in
the time set here.
Attention: If possible, do not enter a value below 0.3 here!
1.0
1) Rated operational current of RA-SP,
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