Danfoss VLT AutomationDrive FC 301 Programming Manual page 173

Parameter Descriptions
14-25 Trip Delay at Torque Limit
Range: Function:
(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.
14-26 Trip Delay at Inverter Fault
Range: Function:
0. s [0 - 35 s] 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.
14-28 Production Settings
Range:
0 [No action]
*
1 [Service reset]
[2] Set Production Mode
14-29 Service Code
Range:
0 N/A [-2147483647 - 2147483647 N/A]
*
3.14.4 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
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.
MG33MO02
Programming Guide
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
Function:
14-35 Stall Protection
Option:
Function:
For internal use only.
[0]
[1]
*
14-36 Field-weakening Function
Select the field weakening function mode in flux mode.
Range:
0
*
1
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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 control 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.
Disabled Disables stall protection in field weakening flux
mode and might cause the motor to be lost.
Enabled Enables stall protection in field weakening flux
mode.
Function:
[Auto] In this mode, the frequency converter calculates the
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.
[1/x] The frequency converter reduces torque output.
The frequency converter sets the magnetizing
reference inversely proportional to the speed using a
static curve that shows the relationship between DC-
link voltage and the speed.
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