Commissioning
821XKlimaBA0399 5-5
5.3.3 Setting of the current limit (I
max
)
Code Name
Possible settings
IMPORTANT
Lenze Selection Info
C022 I
max
limit
motor mode
150 30 {1 %} 150
C023 I
max
limit
generator mode
80 30 {1 %} 150
Function The controllers are equipped with a current-limit control which determines the
dynamic response under load. The measured load is compared with the limit values
set under C022 for motor load and under C023 for generator load. If the current-limit
values are exceeded, the controllerwill change its dynamic response.
Adjustment The acceleration and decleration time should be set short enough so that the drive can
follow the speed profile without reaching I
max
of the controller.
Drive characteristic
when reaching the limit
value
-
During acceleration:
- Expansion of the acceleration ramp.
-
During deceleration:
- Expansionof the deceleration ramp.
-
When the load increases at constant speed:
- When the motor-current limit value is reached:
Reduction of the field frequency to 0.
- When the generator-current limit value is reached:
Increase the field frequencyto the maximumfrequency(C011).
- Stop the field-frequency change if the load falls below the limit value.
Important
-
In the generator mode the current can only be controlled correctlywhen you
connect a brake unit or in group drive with energy exchange.
-
For operation with chopper frequencies > 8 kHz, the current limit values should be
set to the currents ”I
max
for 60 s” indicated in the rated data (see chapter 3.2).
(Derating with higher chopper frequencies)
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