Multilin 869 Overview

The Multilin 869 Motor Protection System is a protection device

designed for the management, protection and control of medium to large

horsepower motors. The 869 provides comprehensive protection and

control of various types of motors with different loads they run.

Protection & Control

As part of the 8 Series family, the Multilin 869 provides superior protection

and control. The 869 offers comprehensive protection and control solutions

for medium and large motors for various applications. It contains a full range

of selectively enabled, self contained protection and control elements.

Recent enhancements include the following:

Starting Control

• Start sequence control

• Reluctance torque synchronization

• Incomplete start sequence

• Stabilizing feature

• Auto loading and unloading feature

Squirrel Cage Rotor Thermal Protection (separate from the main

thermal model)

• Time vs speed curve based

• Reduced voltage starting feature

Enhanced Thermal Protection with Speed Biasing

Enhanced power factor protection

• Ride-through feature – directly trips motor

• Resynchronization feature – allows motor to re-synchronize instead of

tripping