Voltage offset scaling

  • Menu: 4.1.2-6.4-1
  • Index: 8583.1

Description

Voltage offset of the analog output. The parameter is added to the scaled value of the data source.

The physical output value at the analog output (voltage output/current output) is calculated from the quantities without units in the device according to the following formula:

[Output value]

= V or mA

Raw value

Source value without units

Conversion factor

Fixed value:

  • for voltage: 1 V/1000
  • for current: 1 mA/500

Numerator scaling

Parameter Numerator scaling

Denominator scaling

Parameter Denominator scaling

Offset

Parameter Voltage offset scaling or Current offset scaling

The raw value is the measured source value without units scaled with the number of decimal places:

Source value

Quantity of parameter Data source without unit

Number of decimal places

The number of decimal places depends on the position at which the analog setpoint is to be used:

  • For use with user unit (e.g. speed setpoint), it is defined by the user in the parameter Number of decimal places (parameter group Drive trains > Drive train DT > User unit).
  • For use with system units (e.g. torque setpoint), it is defined by the inverter and can be determined via the tool tip of the parameter.

The following quantities are given in the example:

Quantity

Value

Function of the analog output

+/- 10 V output

Data source of the analog output

Actual speed in user units

Current actual speed from the parameter Speed as source value (parameter group Diagnostics > Process values > Active drive train)

20.00 rev. min-1

User unit

Rev. min-1

Number of decimal places

2

Conversion factor

1000/1 V

Numerator scaling

1

Denominator scaling

5

Offset (parameter Voltage offset scaling)

2.5 V

[Output voltage] = V