14-29 Service Code
Range:
Function:
0
*
[-2147483647 - 2147483647 ]
Service use only.
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
and
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
Coast
inverse
[2] or
Coast and reset inv.
[3]. 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
Coast inverse
[2] or
Coast
and reset inv.
[3], 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 %
*
[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.
14-31 Current Lim Ctrl, Integration Time
Range:
Function:
Size related
*
[0.002 -
2.000 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.
14-32 Current Lim Ctrl, Filter Time
Range:
Function:
Size related
*
[1.0 - 100.0 ms] Sets a time constant for the
current limit controller low-pass
filter.
3.14.4 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 Optimization is only active if
, is set for either
Auto Energy Optim.
Compressor
[2] or
Auto Energy Optim. VT
[3].
14-40 VT Level
Range:
Function:
66 %
*
[40 - 90
%]
Enter the level of motor magnetisation at low
speed. Selection of a low value reduces
energy loss in the motor, but also reduces
load capability.
This parameter cannot be adjusted while the
motor is running.
NOTE
This parameter is not active when
is
set to [1] PM non salient SPM.
14-41 AEO Minimum Magnetisation
Range:
Function:
Size related
*
[40 - 75
%]
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.
NOTE
This parameter is not active when
is
set to [1] PM non salient SPM.
14-42 Minimum AEO Frequency
Range:
Function:
10 Hz
*
[5 - 40 Hz] Enter the minimum frequency at which the
Automatic Energy Optimisation (AEO) is to
be active.
NOTE
This parameter is not active when
is
set to [1] PM non salient SPM.
14-43 Motor Cosphi
Range:
Function:
Size
related
*
[0.40 -
0.95 ]
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.
NOTE
This parameter is not active when
is
set to [1] PM non salient SPM.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
111
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