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CHAPTER 4: SETPOINTS
Protection
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
The 869 protection elements are organized in six (6) identical setpoint groups: Setpoint
Group 1 to Setpoint Group 6.
Figure 4-27: Protection Display Hierarchy
Each Setpoint Group has the same protection functions, depending on the relay order
code. These protection functions include:
Motor Elements
•
Percent Differential
•
Thermal Model
•
Current Unbalance
•
Mechanical Jam
•
Undercurrent
•
Overload Alarm
•
Short Circuit
•
Ground Fault
•
Acceleration Time
•
Underpower
2-Speed Motor Elements
•
Speed2 Thermal Model
•
Speed2 Acceleration
•
Speed2 Undercurrent
Current Elements
•
Phase Time Overcurrent
•
Phase Instantaneous Overcurrent
•
Phase Directional Overcurrent
•
Neutral Time Overcurrent
•
Neutral Instantaneous Overcurrent
•
Neutral Directional Overcurrent
PROTECTION
4–103
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