Rockwell Automation Publication 193-UM015D-EN-P - February 2015
201
Protective Trip and Warning Functions
Chapter 6
Table 242 - Under Frequency Trip Level (Parameter 371)
Under Frequency Warning
The E300 Electronic Overload Relay indicates an Under Frequency warning if:
•
No warning currently exists
•
Under Frequency Warning is enabled
•
Voltage is present
•
Under Frequency Inhibit Time has expired
•
The voltage frequency is equal to or less than the Under Frequency
Warning Level
When the Under Frequency Warning conditions are satisfied, the:
•
TRIP/WARN LED flashes a yellow 1-long / 5-short blink pattern
•
Bit 4 in Voltage Warning Status (Parameter 11) sets to 1
•
Bit 1 in Device Status 0 (Parameter 20) sets to 1
•
Any relay outputs configured as a Warning Alarm close
Under Frequency Warn Level
•
Under Frequency Warn Level (Parameter 372) allows you to define the
frequency at which the E300 Electronic Overload Relay indicates a
warning. It is user-adjustable from 46…65 Hz.
Table 243 - Under Frequency Warn Level (Parameter 372)
Default Value
57
Minimum Value
46
Maximum Value
65
Parameter Type
USINT
Size (Bytes)
1
Scaling Factor
1
Units
Hz
IMPORTANT
The Under Frequency Inhibit Time starts after a phase voltage transitions from
0V to 20V L-L. The E300 Electronic Overload Relay does not begin monitoring
for an under frequency condition until the Under Frequency Inhibit Time
expires.
Default Value
58
Minimum Value
46
Maximum Value
65
Parameter Type
USINT
Size (Bytes)
1
Scaling Factor
1
Units
Hz
Summary of Contents for Allen-Bradley E300
Page 1: ...E300 Electronic Overload Relay Bul 193 592 User Manual...
Page 128: ...128 Rockwell Automation Publication 193 UM015D EN P February 2015 Chapter 5 Operating Modes...
Page 304: ...304 Rockwell Automation Publication 193 UM015D EN P February 2015 Chapter 7 Commands Notes...
Page 502: ...502 Rockwell Automation Publication193 UM015D EN P November 2013 Appendix B Parameter List...
Page 545: ......