Rockwell Automation Publication 193-UM015D-EN-P - February 2015 21
Product Overview Chapter 1
Bus Power Supply supplies enough current for a fully loaded E300 Electronic
Overload Relay Expansion Bus (four Digital Expansion Modules, four Analog
Expansion Modules, and one Operator Station). You can use either Expansion
Bus Power Supply with any combination of Digital and Analog Expansion
Modules.
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
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