Rockwell Automation Publication 193-UM015D-EN-P - February 2015
155
Protective Trip and Warning Functions
Chapter 6
Table 190 - Underload Trip Delay (Parameter 256)
Underload Trip Level
Underload Trip Level (Parameter 257) allows you to define the current at which
the E300 Electronic Overload Relay trips on an underload. It is user-adjustable
from 10…100% of the FLA Setting (Parameter 171).
Table 191 - Underload Trip Level (Parameter 257)
Underload Warning
The E300 Electronic Overload Relay indicates an underload warning if:
•
No warning currently exists
•
Underload Warning is enabled
•
Current is present
•
Underload Inhibit Time has expired
•
The minimum phase current is less than the Underload Warning Level
Default Value
5.0
Minimum Value
0.1
Maximum Value
25.0
Parameter Type
USINT
Size (Bytes)
1
Scaling Factor
10
Units
Seconds
Default Value
50
Minimum Value
10
Maximum Value
100
Parameter Type
USINT
Size (Bytes)
1
Scaling Factor
1
Units
%FLA
IMPORTANT
The Underload Inhibit Timer starts after the maximum phase of load current
transitions from 0 A to 30% of the minimum fla SETTING of the device. The
E300 Electronic Overload Relay does not begin monitoring for an underload
condition until the Underload Inhibit Time expires.
IMPORTANT
For any given application, the practical limit of the Underload Trip Level
(Parameter 246) is dependent on the FLA Setting and the lower limit of the
E300 Electronic Overload Relay’s current measurement capability.
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: ......