172 Rockwell Automation Publication 193-UM015D-EN-P - February 2015
Chapter 6 Protective Trip and Warning Functions
L1 Over Current Warning Level
L1 Over Current Warning Level (Parameter 278) allows you to define the current
at which the E300 Electronic Overload Relay indicates a L1 Over Current
warning. It is user-adjustable from 10…100% for the FLA Setting (Parameter
171).
Table 210 - L1 Over Current Warning Level (Parameter 278)
L2 Over Current Trip
The E300 Electronic Overload Relay trips with a L2 Over Current indication if:
• No trip currently exists
• 2 Over Current Trip is enabled
• Current is present
• Over Current Inhibit Timer has expired
• 2 Percent FLA (Parameter 48) is greater than the L2 Over Current Trip
Level for a time period greater than the L2 Over Current Trip Delay.
If the E300 Electronic Overload Relay trips on a L2 Over Current, the:
• TRIP/WARN LED status indicator flashes a red 12-short blink pattern
• Bit 11 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 90
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %FLA
The L1 Over Current Warning function does not include a time delay feature.
Once the Over Current Inhibit Timer has expired, the L1 Over Current Warning
indication is instantaneous.
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