Current Limit Control - Danfoss VLT AutomationDrive EZ FC 321 Programming Manual

VLT® AutomationDrive EZ FC 321
Programming Guide
Parameter 14-24 Trip Delay at Current Limit
Table 489: Parameter 14-24 Trip Delay at Current Limit
14-24 Trip Delay at Current Limit
Default value: 60 s
Conversion index: 0
Enter the current limit trip delay in s. When the output current reaches the current limit (parameter 4-18 Current Limit), a warning is
triggered. When the current limit warning has been continuously present for the period specified in this parameter, the drive trips.
To run continuously in current limit without tripping, set the parameter to 60 s. Thermal monitoring of the drive remains active.
Parameter 14-26 Trip Delay at Inverter Fault
Table 490: Parameter 14-26 Trip Delay at Inverter Fault
14-26 Trip Delay at Inverter Fault
Default value: Size related
Conversion index: 0
When the drive detects an overvoltage in the set time, a trip is effected after the set time. If the value is 0, protection mode is disa-
bled.
Disable protection mode in hoisting applications.

4.14.4 14-3* Current Limit Control

The drive features an integral current limit controller, which is activated when the motor current, and thus the torque, is higher than
the torque limits set in parameter 4-16 Torque Limit Motor Mode and parameter 4-17 Torque Limit Generator Mode. When the current
limit is reached during motor operation or regenerative operation, the drive tries to reduce torque below the preset torque limits as
quickly as possible without losing control of the motor. While the current control is active, the drive can only be stopped by setting
a digital input to [2] Coast inverse or [3] Coast and reset inv. Any signals on terminals 18–33 are not active until the drive is no longer
near the current limit. By using a digital input set to [2] Coast inverse or [3] Coast and reset inv., the motor does not use the ramp-
down time, since the drive is coasted. If a quick stop is necessary, use the mechanical brake control function along with an external
electro-mechanical brake attached to the application.
Parameter 14-30 Current Lim Ctrl, Proportional Gain
Table 491: Parameter 14-30 Current Lim Ctrl, Proportional Gain
14-30 Current Lim Ctrl, Proportional Gain
Default value: 100%
Conversion index: 0
Enter the proportional gain value for the current limit controller. Selection of a high value makes the controller react faster. Too high
a setting leads to controller instability.
Parameter 14-31 Current Lim Ctrl, Integration Time
Table 492: Parameter 14-31 Current Lim Ctrl, Integration Time
14-31 Current Lim Ctrl, Integration Time
Default value: Size related
Conversion index: -3
Controls the current limit control integration time. Setting it to a lower value makes it react faster. A setting too low leads to control-
ler instability.
Danfoss A/S © 2021.08
Parameter type: Range, 0 - 60 s
Data type: Uint8
Parameter type: Range, 0 - 35 s
Data type: Uint8
N O T I C E
Parameter type: Range, 0 - 500%
Data type: Uint16
Parameter type: Range, 0.002 - 2 s
Data type: Uint16
Parameter Descriptions
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: False
Setup: All setups
Change during operation: False
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