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Stator resistance

P208

(stator resistance)

0.00 ... 300.00 Ω

Motor stator resistance ⇒ resistance of a phase winding in a DC motor.

{ see information }

Has a direct effect on current control of the VFD. Too high a value can lead to overcurrent; too low

a value to low motor torque.

Parameter P220 can be used for simple measurement. Parameter P208 can be used for manual

setting or as information about the result of an automatic measurement.

NOTE:

For optimum functioning of current vector control, stator resistance must be measured

automatically by the VFD.

The default setting depends on the rated VFD output or the setting in P200.

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No load current

P209

(no load current)

0.0 ... 1000.0 A

This value is always calculated automatically from motor data if there is a change in parameter

P206 >cos ϕ< and parameter P203 >Rated current<.

{ see information }

NOTE:

The default setting depends on the rated VFD output or the setting in P200.

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Static boost

P210

(static boost)

0 ... 400 %

Static boost affects the current which generates the magnetic field. This is equivalent to the no-load

current of the respective motor and is therefore load-independent. The no-load current is calculated

{ 100 }

using the motor data. The factory setting of 100% is sufficient for typical applications.

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Dynamic boost

P211

(dynamic boost )

0 ... 150 %

Dynamic boost affects the torque-generating current and is therefore a load-dependent parameter.

The factory setting of 100% is also sufficient for typical applications.

{ 100 }

Too high a value can result in overcurrent in the VFD. The output voltage will then rise too sharply

under load. Too low a value will lead to insufficient torque.

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With certain applications, particularly those with high centrifugal mass (e.g. fan drives), it may be

necessary to control the motor with the aid of a U/f characteristic curve. In order to do this, set

parameters P211 and P212 each to 0%.

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BU 0200 en-US-3118

Information

If the value is to be entered directly, then it must be set as the last of the motor data.

This is the only way to ensure that the value will not be overwritten.

Information

5 Parameter

Default setting

V/f characteristic curve