Energy Optimising; Environment; Current Lim Ctrl, Proportional Gain; Current Lim Ctrl, Integration Time - Danfoss VLT Programming Manual

3 Parameter Description
While the current control is active, the frequency converter can only be stopped by setting a digital input to
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
is coasted.

14-30 Current Lim Ctrl, Proportional Gain

Range:
100 %* [0 - 500 %]
3

14-31 Current Lim Ctrl, Integration Time

Range:
0.020 s* [0.002 - 2.000 s]
14-32 Current Lim Ctrl, Filter Time
Range:
26.0 ms* [1.0 - 100.0 ms]

3.14.6 14-4*Energy Optimising

Parameters for adjusting the energy optimisation level in both Variable Torque (VT) and Automatic Energy Optimization (AEO) mode.
Automatic Energy Optimization is only active if par. 1-03
Optim. VT
[3].
14-40 VT Level
Range:
66 %* [40 - 90 %]
14-41 AEO Minimum Magnetisation
Range:
Application [40 - 75 %]
dependent*
14-42 Minimum AEO Frequency
Range:
10 Hz* [5 - 40 Hz]
14-43 Motor Cosphi
Range:
Application [0.40 - 0.95 N/A]
dependent*

3.14.7 14-5* Environment

These parameters help the frequency converter to operate under special environmental conditions.
152
Coast inverse [2] or Coast and reset inv.
Function:
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:
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:
Torque Characteristics
Function:
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.
Function:
Enter the minimum allowable magnetisation for AEO. Selection of a low value reduces energy loss
in the motor, but can also reduce resistance to sudden load changes.
Function:
Enter the minimum frequency at which the Automatic Energy Optimisation (AEO) is to be active.
Function:
The Cos(phi) setpoint is automatically set for optimum AEO performance during AMA. This param-
eter should normally not be altered. However in some situations it may be necessary to enter a new
value to fine-tune.
MG.11.C9.02 - VLT
VLT
Coast inverse
[3], the motor does not use the ramp-down time, since the frequency converter
Auto Energy Optim. Compressor
, is set for either
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®
HVAC Drive Programming Guide
Coast and reset inv.
[2] or [3].
Auto Energy
[2] or