VACUUM SYSTEM FOR A FIBER WEB MACHINE AND METHOD IN THE VACUUM SYSTEM OF A FIBER WEB MACHINE

摘要

The invention relates to a vacuum system for a fiber web machine. The vacuum system includes several vacuum devices (10) each of which is provided with a motor (11, II1). In addition, the vacuum system includes negative pressure lines (12) for leading a vacuum from the vacuum devices (10) to the applications. The vacuum devices (10) are adapted to maintain constant pressure in the initial part of the negative pressure lines (12). In addition, the rotation speed of at least one motor (H') is adapted to be variable and the control devices (22) included in the motors (11, 11') are connected to each other for adjusting the capacity of the vacuum system. The invention also relates to a method in a vacuum system of a fiber web machine.