SSD 605C Product Manual - page 85

Programming Your Application 

6-19

605C Frequency Inverter

Functional Description

The current feedback function block processes motor

line current measurements and provides diagnostics of

line current magnitude, torque producing current and

magnetic field producing current components. The line

current magnitude (the motor current measured using a

current meter) can be considered to be the vector sum of

the field and torque producing current components.

The function block requires appropriate values for full-

load and no-load motor currents to be entered. Once

done, the function block will provide measurements of:-

rms line current:

I MAGNITUDE (MOTOR CURRENT)

rms field current component:

I MAGNETISING

torque current component:

I TORQUE.

These diagnostics are presented in Amps, and as a percentage of the user set motor full-load

current.

In addition, the field current component is re-scaled to provide a FIELD diagnostic. A value of

100.0% in the field diagnostic indicates that the motor is operating at rated flux. The torque

current component is re-scaled to provide a LOAD diagnostic. A value of 100.0% in the load

diagnostic indicates that the motor is operating at rated torque or full load.

I TORQUE

Range: xxx.xh % (h)

This diagnostic contains the level of torque producing rms line current component being drawn

from the Inverter and is seen as a % of the FULL LOAD CALIB setting.

I TORQUE

Range:xxxx.x A

This diagnostic contains the level of torque producing rms line current component being drawn

from the Inverter.

LOAD

Range: xxx.xh % (h)

This diagnostic is a normalised version of the  I TORQUE diagnostic. A value of 100%

indicates the motor is operating at rated load (torque).

FIELD

Range: xxx.xh % (h)

This diagnostic is a normalised version of the I MAGNESTISING diagnostic. A value of 100%

indicates the motor is operating at rated magnetic flux (field).

I TORQUE

I MAGNETISING

MOTOR CURRENT