Current Limit Control; Trip Delay At Torque Limit; Current Lim Ctrl, Proportional Gain; Field-Weakening Function - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions
14-24 Trip Delay at Current Limit
Range:
3 3

14-25 Trip Delay at Torque Limit

Range:
60 s [0 -
*
60 s]
14-26 Trip Delay at Inverter Fault
Range:
Size related
*
s]
14-28 Production Settings
Range:
0 [No action]
*
1 [Service reset]
[2] Set Production Mode
14-29 Service Code
Range:
0 [-2147483647 - 2147483647 ]
*

3.14.3 14-3* Current Limit Control

The frequency converter 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 frequency converter 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 frequency converter
can only be stopped by setting a digital input to [2] Coast
inverse or [3] Coast and reset inv. Any signals on terminals
196
Function:
set the parameter to 60 s. Thermal monitoring of
the frequency converter remains active.
Function:
Enter the torque limit trip delay in s. When the
output torque reaches the torque limits
(parameter 4-16 Torque Limit Motor Mode and
parameter 4-17 Torque Limit Generator Mode), a
warning is triggered. When the torque limit
warning has been continuously present for the
period specified in this parameter, the frequency
converter trips. Disable the trip delay by setting
the parameter to 60 s. Thermal monitoring of the
frequency converter remains active.
Function:
[ 0 - 35 When the frequency converter detects
an overvoltage in the set time, trip is
effected after the set time.
If value is 0, protection mode is
disabled.
NOTICE
Disable protection mode in
hoisting applications.
Function:
Function:
For internal use only.
Danfoss A/S © 10/2018 All rights reserved.
®
VLT AutomationDrive FC 301/302
18–33 are not active until the frequency converter 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 frequency converter 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.

14-30 Current Lim Ctrl, Proportional Gain

Range:
100 %
*
14-31 Current Lim Ctrl, Integration Time
Range:
Size related
14-32 Current Lim Ctrl, Filter Time
Range:
Size
related
*
14-35 Stall Protection
Option:
[0] Disabled Disables stall protection in field weakening flux
[1] Enabled Enables stall protection in field weakening flux
*

14-36 Field-weakening Function

Select the field weakening function mode in flux mode.
Range:
0 [Auto] In this mode, the frequency converter calculates the
*
Function:
[0 - 500 %] 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.
Function:
[0.002 - 2 s] Controls the current limit control
*
integration time. Setting it to a lower
value makes it react faster. A setting
too low leads to controller instability.
Function:
[1 - Controls the current limit control low-pass
100 ms] filter.
This makes it possible to react to peak
values or to average values. When
selecting average values, it is sometimes
possible to run with higher output current
and instead trip on the hardware limit for
current. However, the control reacts slower
as it does not react on immediate values.
Function:
Parameter 14-35 Stall Protection is active in flux
mode only.
mode and might cause the motor to be lost.
mode.
Function:
optimal torque output.
Measured DC-link voltage determines the phase-to-
phase motor voltage. Magnetizing reference is based
on the actual voltage and utilizes the information
about the model of the motor.
MG33MP02