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 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 0.
- 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.
Important
-
In the generator mode the current can only be controlled correctly when 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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Summary of Contents for 8210 HVAC Series
Page 52: ...Commissioning 5 14 821XKlimaBA0399 Show Hide Bookmarks...
Page 62: ...Commissioning 5 24 821XKlimaBA0399 Show Hide Bookmarks...
Page 64: ...During operation 6 2 821XKlimaBA0399 Show Hide Bookmarks...
Page 78: ...Configuration 7 14 821XKlimaBA0399 Show Hide Bookmarks...
Page 84: ...Troubleshooting and fault elimination 8 6 821XKlimaBA0399 Show Hide Bookmarks...
Page 88: ...Accessories 9 4 821XKlimaBA0399 Show Hide Bookmarks...
Page 92: ...Index 10 4 821XKlimaBA0399 Show Hide Bookmarks...
Page 93: ...Index 821XKlimaBA0399 10 5 Show Hide Bookmarks...
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