10/05 AWB8230-1541GB
Monitoring functions
113
Suppressing overcurrent stopping
In applications with highly dynamic drives and rapid load changes,
motor current limitation (PNU b020 to b028) can not prevent
sudden overcurrents. The result is a motor stop with the fault
message E 01 to E 03.
With PNU b140 you can access the inverter directly when a sudden
overcurrent is detected. PNU b140 = 01 sets an automatic
reduction of the pulse frequency and a delay of the output values
(voltage, frequency) until the current is within the control range
again. This prevents unintentional stopping and generation of a
fault signal.
PNU Name RUN b031
= 10
Value Function DS
b021 Motor current
limitation –
function
– j 00 OFF, disabled 01
b221 01 ON, enabled in acceleration phase and at constant speed
02 Enabled only at constant speed. This allows higher acceleration currents
for short periods.
b022 Tripping
current for
motor current
limitation
– j Default,
dependent on
frequency
inverter’s rated
current (Ie)
Setting range of the tripping current as a multiple of the frequency
inverter rated current, i.e. the range is given in amperes (A).
Ie x
1.5
b222
b023 Motor current
limitation,
deceleration
time constant
– j 0.1 – 3000 s When specified current limit is reached, the frequency is reduced in the
time set here.
Caution: If possible, do not enter a value below 0.3 here!
1.0
b223
b028 Motor current
limitation, limit
current
selection
– j 00 Value of PNU b022 (constant tripping current limit) 00
b228 01 Analog input O-L (variable tripping current limit)
Externally adjustable current limitation (0 – 10 V h 10 – 150 % I
e
)
b140 Suppress stop
on overcurrent
– j 00 OFF, disabled 00
01 ON, enabled. Automatic reduction of pulse frequency at overcurrent.
I
e
= inverter rated current
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