
Rockwell Automation Publication 193-UM015B-EN-P - June 2014 19
Product Overview Chapter 1
Overload Relay Expansion Bus (four Digital Expansion Modules, four Analog
Expansion Modules, and one Operator Station).
Protection Features
Standard Current-Based Protection
All versions of the E300
Electronic Overload Relay provide the following motor
protection functions:
• Thermal Overload (51)
• Phase Loss
• Current Imbalance (46)
• Undercurrent – load loss (37)
• Overcurrent – load jam (48)
• Overcurrent – load stall
• Start Inhibit (66)
Ground Fault Current Based Protection
The E300 Electronic Overload Relay sensing modules and control modules with
a ground fault current option provides the following motor protection function:
• Ground Fault – zero sequence method (50N)
Voltage and Power Based Protection
The E300 Electronic Overload Relay sensing modules with voltage sensing
provides the following motor protection functions:
• Undervoltage (27)
• Overvoltage (59)
• Phase Reversal (47) – voltage based
• Over and Under Frequency (81) – voltage based
• Voltage Imbalance (46)
• Over and Under Power (37)
• Over and Under Leading/Lagging Power Factor (55)
• Over and Under Reactive Power Generated
• Over and Under Reactive Power Consumed
• Over and Under Apparent Power
Komentáře k této Příručce