Setting Parameters
01/02 AWB8230-1413GB
138
Current limit
With the current limit setting, the output current can be limited. To
reduce the load current, the frequency inverter ends the frequency
increase in the acceleration phase or reduces the output frequency
during static operation as soon as the output current rises above
the current limit set with this function, (the time constant for
control at the current limit is defined under PNU b023 or b026). As
soon as the output current drops below the set current limit, the
frequency increases again to the configured setpoint value. The
current limit can be deactivated for the acceleration phase, so that
higher currents for acceleration are allowed for brief periods
(
a
PNU b021 or b024).
With PNU b024 to b026, you can program a second current limit,
which can be called up through digital input OLR (
a
section
“Change over current limit (OLR)”, page 87).
The current limit can not prevent a fault message being issued and
the frequency inverter being switched off due to a sudden
overcurrent, for example caused by a short circuit.
Figure 143: Current limit
I
M
: Motor current
I
1
: Current limit
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).
I
1
A004
f
I
t
PNU b023
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
b021
Current limit
characteristic 1
–
j
00
Motor current limit not active
01
01
Motor current limit active in all operating states
02
Motor current limit not active during acceleration
b022
Tripping
current 1
–
j
0.5 to
1.5
x
I
e
Setting range of the tripping current as a multiple of the
frequency inverter rated current, i.e. the range is given in
amperes (A).
1.2
x
I
e
1)
b023
Time constant 1
–
j
0.1 to 30 s
When the set current limit is reached, the frequency is
reduced in the time specified here.
Caution: If possible, do not enter a value less than 0.3 here!
1.0
b024
Current limit
characteristic 2
–
j
00
Motor current limit not active
01
01
Motor current limit active in all operating states
02
Motor current limit not active during acceleration
b025
Tripping
current 2
–
j
0.5 to
1.5
x
I
e
Setting range of the tripping current as a multiple of the
frequency inverter rated current, i.e. the range is given in
amperes (A).
1.2
x
I
e
1)
b026
Time constant 2
–
j
0.1 to 30 s
When the set current limit is reached, the frequency is
reduced in the time specified here.
Caution: If possible, do not enter a value less than 0.3 here!
1.0
1) Inverter rated current
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