14-29 Service Code
Range:
Function:
000000 [000000 Hex - FFFFF]
For internal service only.
2.15.5. 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 and 4-17.
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. If a quick stop is necessary, use the mechanical brake control function along with an external electro-mechanical brake attached to the
application.
14-30 Current Lim Cont, 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 Contr, 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 instabillity.
2.15.6. 14-4* Energy Optimising
Parameters for adjusting the energy optimisation level in both Variable
Torque (VT) and Automatic Energy Optimization (AEO) mode in par. 1-03.
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:
10Hz
*
[5 - 40 Hz]
Enter the minimum frequency at which the Automatic Energy Optimisation (AEO) is to be active.
14-43 Motor Cosphi
Range:
Function:
0.66
*
[0.40 - 0.95]
The Cos(phi) setpoint is automatically set for optimum AEO performance. This parameter should normally not
be altered. However in some situations it may be necessary to enter a new value to fine-tune.
FC 300 Programming Guide
2. How to Programme
MG.33.M3.02 - VLT
®
is a registered Danfoss trademark
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