Danfoss VLT AQUA Drive FC 200 Programming Manual page 109

Parameter Description
3.13.3 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
3 3 4-16 Torque Limit Motor Mode and 4-17 Torque Limit
Generator Mode.
When the current limit is reached during motor operation
or regenerative operation, the frequency converter will try
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 to 33 will not be 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:
100 % [5 - 500 %] Enter the proportional gain value for the
*
14-31 Current Lim Ctrl, Integration Time
Range:
0.020 s [0.002 - 2.000
*
s]
14-32 Current Lim Ctrl, Filter Time
Range:
27.0 ms [1.0 - 100.0 ms] Sets a time constant for the current
*
3.13.4 14-4* Energy Optimising
Parameters for adjusting the energy optimisation level in
both Variable Torque (VT) and Automatic Energy Optimi-
zation (AEO) mode.
Automatic Energy Optimisation is only active if 1-03 Torque
Characteristics, is set for either [2] Auto Energy Optim. CT or
[3] Auto Energy Optim. VT.
14-40 VT Level
Range:
66 % [40 - 90 %] Enter the level of motor magnetisation at
*
108
®
VLT AQUA Drive Programming Guide
Function:
current limit controller. Selection of a high
value makes the controller react faster. Too
high a setting leads to controller
instability.
Function:
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:
limit controller low-pass filter.
Function:
low speed. Selection of a low value reduces
energy loss in the motor, but also reduces
load capability.
MG20O602 - VLT
NOTE
This parameter is not active when 1-10 Motor Construction
is set to [1] PM, non salient SPM.
NOTE
This parameter cannot be adjusted while the motor is
running.
14-41 AEO Minimum Magnetisation
Range:
Size related [40 - 75
*
%]
NOTE
This parameter is not active when 1-10 Motor Construction
is set to [1] PM, non salient SPM.
14-42 Minimum AEO Frequency
Range:
10 Hz [5 - 40 Hz] Enter the minimum frequency at which the
*
NOTE
This parameter is not active when 1-10 Motor Construction
is set to [1] PM, non salient SPM.
14-43 Motor Cosphi
Range:
Size [0.40 -
related 0.95 ]
*
NOTE
This parameter is not active when 1-10 Motor Construction
is set to [1] PM, non salient SPM.
3.13.5 14-5* Environment
These parameters help the frequency converter to operate
under special environmental conditions.
14-50 RFI Filter
Option: Function:
[0] Off
[1] On Select [1] On to ensure the frequency converter
*
complies with EMC standards.
®
is a registered Danfoss trademark
Function:
Enter the minimum allowable magnet-
isation for AEO. Selection of a low
value reduces energy loss in the
motor, but can also reduce resistance
to sudden load changes.
Function:
Automatic Energy Optimisation (AEO) is to
be active.
Function:
The Cos(phi) setpoint is automatically
set for optimum AEO performance
during AMA. This parameter should
normally not be altered. However in
some situations it may be necessary to
enter a new value to fine-tune.