Danfoss VLT AQUA Drive FC 202 Programming Manual page 139

Parameter Description
14-25 Trip Delay at Torque Limit
Range: Function:
60 s [0 - Enter the torque limit trip delay in s. When the
*
60 s] 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 frequency
converter monitoring remains active.
14-26 Trip Delay at Inverter Fault
Range: Function:
Size related [0 - 35 s] When the frequency converter detects
*
an overvoltage in the set time, trip is
effected after the set time.
3.13.4 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 signal 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.
14-30 Current Lim Ctrl, Proportional Gain
Range: Function:
100 % [5 - 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.
14-31 Current Lim Ctrl, Integration Time
Range: Function:
Size related [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.
MG20OB02
Programming Guide
14-32 Current Lim Ctrl, Filter Time
Range:
Size related
3.13.5 14-4* Energy Optimizing
Parameters for adjusting the energy optimization level in
both variable torque (VT) and automatic energy optimi-
zation (AEO) mode.
Automatic energy optimization is only active if
parameter 1-03 Torque Characteristics is set to either [2]
Auto Energy Optim. CT or [3] Auto Energy Optim. VT.
14-40 VT Level
Range:
66 %
90 %]
*
14-41 AEO Minimum Magnetisation
Range:
Size
related
*
14-42 Minimum AEO Frequency
Range:
Size
related
*
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Function:
[1 - 100 ms] Sets a time constant for the current
*
limit controller low-pass filter.
Function:
NOTICE
[40 -
This parameter cannot be adjusted while
the motor is running.
NOTICE
This parameter is not active when
parameter 1-10 Motor Construction is set to
[1] PM, non-salient SPM.
Enter the level of motor magnetization at low
speed. Selection of a low value reduces energy
loss in the motor, but also reduces load
capability.
Function:
NOTICE
[ 30 -
200 %]
This parameter is not active when
parameter 1-10 Motor Construction is
set to [1] PM, non-salient SPM.
Enter the minimum allowable magnetization
for AEO. Selection of a low value reduces
energy loss in the motor, but can also
reduce resistance to sudden load changes.
Function:
NOTICE
[0 - 40
Hz]
This parameter is not active when
parameter 1-10 Motor Construction is
set to [1] PM, non-salient SPM.
Enter the minimum frequency at which
the automatic energy optimization (AEO)
is to be active.
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