Commissioning
820XBA1097 5-7
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 %} 110
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 controller will 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:
- Expansion of the deceleration ramp.
-
When the load increases at constant speed:
- When the motor-current limit value is reached:
Reduction of the field frequency to 10Hz.
- When the generator-current limit value is reached:
Increase the field frequency to the maximum frequency (C011).
- Stop the field-frequency change if the load falls below the limit value.
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