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:
0.020 s* [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:
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
Torque Characteristics
, 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.
14-41 AEO Minimum Magnetisation
Range: Function:
Application
dependent*
[40 - 75 %] 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.
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.
14-43 Motor Cosphi
Range: Function:
Application
dependent*
[0.40 - 0.95 N/A] 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.
3.14.7 14-5* Environment
These parameters help the frequency converter to operate under special environmental conditions.
3 Parameter Description VLT
®
HVAC Drive Programming Guide
152
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
3
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