Siemens 420 manual Example, Normalization / de-normalization

Issue 07/04 3 Functions

Example

The normalization / de-normalization via the "USS to BOP link" serial interface is shown using the reference frequency P2000.

If the connection between two BICO parameters is closed (directly using BICO parameters or indirectly using P0719 or P1000), that have a different representation/notation (normalized representation (hex) or physical representation (Hz)), then the following normalization is made in the drive inverter to the target value:

r0021

x[Hz]

USS-PZD

BOP-Link

x[Hex]

P2016

[0]

[1]

[2]

[3]

r2015

[0]

[1]

[2]

[3]

USS-PZD

BOP-Link

y[Hex]

P1070

y[Hz]

y[Hex] = P2000[Hz]r0021[Hz] ⋅ 4000[Hex]

= r2015[1] ⋅ y[Hz] 4000[Hex] P2000

Fig. 3-7 Normalization / de-normalization

Note

Analog values are limited to 10 V or 20 mA. A maximum of 100 % can be output

/read-in referred to the appropriate reference values as long as no DAC/ADC scaling (factory setting) was made.

Setpoints and actual value signals via the serial interface:

♦When transferring this data via the PZD part, it is limited to the value 7FFF h. This is the reason that the max. value 200 % is referred to the reference value.

♦When transferring this data via the PKW part, it is transferred as a function of the data type and units.

Parameter P1082 (max. frequency) limits, in the drive inverter, the frequency independently of the reference frequency. This is the reason that when P1082 is changed (factory setting: 50 Hz), then the P2000 (factory setting: 50 Hz) should always be adapted. For instance, if for a NEMA motor the parameter is set to 60 Hz and P2000 is not changed, then the analog setpoint / actual value at 100 % or a setpoint/actual value signal at 4000 h is limited to 50 Hz!

MICROMASTER 420	Operating Instructions
6SE6400-5AA00-0BP0	51