Danfoss VLT Series Programming Manual page 112

Parameter Description
14-29 Service Code
Range:
0 [-2147483647 - 2147483647 ]
*
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
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 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 - Controls the current limit control
*
2.000 s] 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:
Size related [1.0 - 100.0 ms] Sets a time constant for the
*
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 1-03 Torque
Characteristics, is set for either Auto Energy Optim.
Compressor [2] or Auto Energy Optim. VT [3].
®
VLT HVAC Drive Programming Guide
Function:
Service use only.
Function:
current limit controller low-pass
filter.
®
MG.11.CC.02 - VLT is a registered Danfoss trademark
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 when1-10 Motor Construction 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 when1-10 Motor Construction 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 when1-10 Motor Construction is
set to [1] PM non salient SPM.
14-43 Motor Cosphi
Range: Function:
Size [0.40 - The Cos(phi) setpoint is automatically
related 0.95 ] 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 when1-10 Motor Construction is
set to [1] PM non salient SPM.
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