Danfoss VLT AutomationDrive FC 302 Programming Manual page 150

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 ]
*
148
Function:
set the parameter to 60 s = Off. Thermal
monitoring of the frequency converter still remains
active.
Function:
Enter the torque limit trip delay in seconds. 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 = Off. Thermal monitoring
of the frequency converter still 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 = 0, protection mode is disabled
NOTICE
It is recommended to disable
protection mode in hoisting
applications.
Function:
Function:
For internal service only.
®
VLT AutomationDrive FC 301/302 Programming Guide
3.15.5 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 to 33 are not active until thefrequency 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:
MG33MI02 - Rev. 2013-11-20
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 in stead 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.