Velocity Edge GX440 Instructions d'exploitation télécharger pdf (Page 338)

Functions, monitoring, and protective functions

9.3 Drive functions

Drive converter cabinet units

338 Operating Instructions, 10/2008, A5E00288214A

9.3.13 Unit changeover

Description

Parameters and process variables for input and output can be switched to a suitable units

system (SI units, US units or referenced variables (%)) with the help of the unit changeover

function.

The following constraints apply to the unit changeover:

● Unit changeover is only possible for the "VECTOR" and "A_INF" drive object.

● Parameters of the rating plate of the drive converter or the motor rating plate can be

changed over between SI/US units; however, a per unit representation is not possible.

● Once the changeover parameter has been changed, all parameters that are assigned to

a unit group depending on this parameter are jointly changed over to the new unit.

● A separate parameter is available for selecting technological units (p0595) for the

representation of technological variables in the technology controller.

● If a changeover is made to referenced variables and the reference variable is

subsequently changed, the % value entered in a parameter will not change.

Example:

– A fixed speed of 80% corresponds, for a reference speed of 1500 rpm, to a value of

1200 rpm.

– If the reference speed is changed to 3000 rpm, the value of 80% is retained and is

now 2400 rpm.

Restrictions

● When a unit changeover occurs, rounding to the decimal places is carried out. This can

mean that the original value might change by up to one decimal place.

● If a referenced form is selected and the reference parameters (e.g. p2000) are changed

retrospectively, the physical significance of some of the control parameters is also

adjusted, which can affect the control behavior.

● Changing the reference variables (p2000 to p2007) in the STARTER in offline mode can

cause parameter value limit violations, leading in turn to error messages when the values

are loaded to the drive unit.

Changing over the units

The units can be changed over via the AOP30 and via STARTER.

● Unit changeover via AOP30 is always carried out immediately. Once the corresponding

parameters have been changed, the values affected are displayed in the new selected

unit.

● If STARTER is used, unit changeover can only take place in offline mode in the

configuration screen of the corresponding drive object. The new units are not displayed

until after the download ("Load project to target system") and subsequent upload ("Load

project to PG") have been completed.

1 2 ... 333 334 335 336 337 338 339 340 341 342 343 ... 529 530

Pas de commentaire

Velocity Edge GX440 Instructions d'exploitation Page 338