Manual

51 Publication 1413-UM001C-EN-P - May 2006

Chapter

Add Special Functionality

For added functionality, custom ladder-logic programming and

hardware integration are permitted, however, strict guidelines must be

followed to comply with warranty contracts.

• Altering of existing ladder-logic code is prohibited and will void

all warranty contracts.

• Additional functionality can only be implemented by adding

additional ladder logic code to subroutine PFMGR4.

• Additional subroutines may be written, but must be called

through PFMGR4.

PFMGR4 Logic

The following sections provide details of PFMGR4 ladder-logic

programming.

Overview

There are three basic sections to PFMGR4:

• Power factor alarm

The power-factor alarming section specifies whether your

system KVAR is within its specified range and how long to wait

before alarming when it is out of range.

• Step control

The step control section specifies when to actuate or trip a step.

• Step routine

The step routine section specifies what step should be actuated

or tripped.