Lenze 8200 - Current Limit Values (Imax Limit Values)

Configuration
8200SHB0199
7-17
7.5.3 Current limit values (I
max
limit values)
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
822X/824X 80 30 {1 %} 150 as of software
1.6 and 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.
Series “HVAC”:
- C023 = 30 %
- Current limit controller for generator mode not active (only for applications with special
machines running at high field frequencies at the same time).
- Only possible with control mode V/f-characteristic control (C014 = -2-) (see chapter 7.5.5).
- C023 = 30 %or C023 = 149 %
- Earth-fault detection not active.
Adjustment Set the acceleration and deceleration times sothat the drive can follow the speed profile without
reaching I
max
.
Controller behaviour when
reaching the limit value
- During acceleration:
- Increase of the acceleration ramp
- During deceleration:
- Increase of the deceleration ramp
- With increasing load and constant speed:
- When reaching the motor-current limit value:
Decrease of the field frequency to
10 Hz at 820X
0 Hz at 821X/822X/824X.
- When reaching the generator-current limit value:
Increase of the field frequencytothe max. frequency (C011).
- 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” indicated in the rated data (see chapter 3.4).
(Derating at higher chopper frequencies)
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