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Rockwell Automation Publication 193-UM015D-EN-P - February 2015
Chapter 6
Protective Trip and Warning Functions
Line Under Current Protection
For non-motor applications when the measured current is less than a specific level
for a specific phase may indicate an electrical malfunction, such as bad resistive
heater element or non-operating incandescent light bulb. Such conditions may
not harm the power system, but it can lead to loss of production or certification
noncompliance.
The E300 Electronic Overload Relay can monitor for an undercurrent condition
per phase with its Line Under Current Trip and Warning function to detect for a
rapid under current in a specific phase to minimize damage and loss of
production.
Under Current Inhibit Time
Under Current Inhibit Time (Parameter 265) allows you to inhibit an L1, L2,
and L3 Under Current trip and warning from occurring during a load starting
sequence. It is adjustable from 0…250 seconds.
Table 197 - Under Current Inhibit Time (Parameter 265)
L1 Under Current Trip
The E300 Electronic Overload Relay trips with a L1 Under Current indication
if:
•
No trip currently exists
•
L1 Under Current Trip is enabled
•
Current is present
•
Under Current Inhibit Timer has expired
•
L1 Percent FLA (Parameter 47) is less than the L1 Under Current Trip
Level for a time period greater than the L1 Under Current Trip Delay.
•
If the E300 Electronic Overload Relay trips on a L1 Under Current, the:
•
TRIP/WARN LED status indicator flashes a red 8-short blink pattern
IMPORTANT
The Current Imbalance Warning function does not include a time delay feature.
Once the Current Imbalance Inhibit Time has expired, the Current Imbalance
Warning indication is instantaneous.
Default Value
10
Minimum Value
0
Maximum Value
250
Parameter Type
USINT
Size (Bytes)
1
Scaling Factor
1
Units
Seconds
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: ......