2-70 Parameter Descriptions
7000-TD002A-EN-P – September 2007
DC Current Reference Step [Idc Ref Step]
Linear Number: 120
Default Value: 0.000 pu
Minimum Value: 0.000 pu
Maximum Value: 1.000 pu
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the magnitude of the step that is added to the dc current command to
demonstrate the step response of the current loop. It is not saved and is initialized to zero at power-up.
DC Link Time Constant [T DC Link]
Linear Number: 115
Default Value: 0.040 sec
Minimum Value: 0.015 sec
Maximum Value: 0.150 sec
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the time constant of the dc link reactor. It affects both the response time and
overshoot of the regulator, and should be adjusted to produce a step response that has zero or a very
small overshoot. This parameter can be set manually or by auto-tuning.
Input Impedance [Input Impedance]
Linear Number: 140
Default Value: 0.0500 pu
Minimum Value: 0.0000 pu
Maximum Value: 1.0000 pu
Access Level: Service
Read/Write: Read/Write
This parameter specifies the input impedance between the drive and the source, including the isolating
transformer if present, expressed in the per unit system of the drive. It is used in the calculation of the
retard limit for the line converter, and reconstruction of the line voltage parameters. This parameter can
be set manually or by auto-tuning.
Feedforward Filter [Feedforward Fil]
Linear Number: 502
Default Value: 2.0 Hz
Minimum Value: 0.0 Hz
Maximum Value: 12.0 Hz
Access Level: Service
Read/Write: Read/Write
This parameter specifies the corner frequency of the filter used in calculating the inverter side dc link
voltage from the measured stator voltage. This value is used a feed-forward term in the current regulator
to determine the firing angle for the line side converter. This parameter is useful in load-sharing conveyor
applications, where it can be used to effectively dampen system mechanical resonance.
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