Rockwell Automation Allen-Bradley E300, User Manual

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166 Rockwell Automation Publication 193-UM015D-EN-P - February 2015
Chapter 6 Protective Trip and Warning Functions
Table 203 - L2 Under Current Warning Level (Parameter 271)
L3 Under Current Trip
The E300 Electronic Overload Relay trips with a L3 Under Current indication
if:
• No trip currently exists
• L3 Under Current Trip is enabled
• Current is present
• Under Current Inhibit Timer has expired
• Percent FLA (Parameter 49) is less than the L3 Under Current Trip Level
for a time period greater than the L3 Under Current Trip Delay.
If the E300 Electronic Overload Relay trips on a L3 Under Current, the:
• TRIP/WARN LED status indicator flashes a red 10-short blink pattern
• Bit 9 in Current Trip Status (Parameter 4) sets to 1
• Bit 0 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Trip Relay open
• Any relay outputs configured as a Control Relay open
• Any relay outputs configured as a Trip Alarm close
• Any relay outputs configured as a Normal Relay are placed in their
Protection Fault state (if so programmed)
Default Value 40
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %FLA
IMPORTANT
The L2 Under Current Warning function does not include a time delay feature.
Once the Under Current Inhibit Timer has expired, the L2 Under Current
Warning indication is instantaneous.