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 par.4-16
Torque Limit Motor Mode and par.
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. Selec-
tion 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]
14-4*Energy Optimizing
Parameters for adjusting the energy optimization level in both Variable Torque (VT) and Automatic Energy Op-
timization (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:
40. %* [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 Optimiza-
tion (AEO) is to be active.
Parameter Description
TR200 Programming Guide 157
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