Lenze 8200 Frequency inverters - Manual (Page 110)

Commissioning
8200SHB0199 5-5
5.3.3 Setting of current limit values (I
max
limits)
Code Name Possible settings IMPORTANT
Lenze Choice Info
C022 I
max
limit
(motor mode)
150 30 {1 %} 150
C023 I
max
limit
(generator mode)
80 30 {1 %} 110 Standard controllers
822X/824X 80 30 {1 %} 150 As of software 1.6
C023 I
max
limit
(generator mode)
80 30 {1 %} 150 Variant “HVAC”
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 limits are exceeded, the controller changes its
dynamic behaviour.
Adjustment Set the acceleration and deceleration times so that the drive can follow the speed profile without
reaching I
max
.
Controller behaviour when a
limit value is reached - During acceleration:
- Increasing the acceleration ramp
- During deceleration:
- Increasing the deceleration ramp
- With increasing load and constant speed:
- When reaching the generator-current limit value:
Increase of the field frequency to the max. frequency (C011).
- When reaching the motor-current limit value:
Lower the field frequency until the drive load is reduced.
- Stop the field frequency change if the load falls below the limit value.
Important
821X/822X/824X - A correct current control in the generator mode is possible only with a connected brake unit or in
the DC-bus connection 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” (see chapter 3.4).
(Derating at higher chopper frequencies.)
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