Rockwell Automation Publication 193-UM015D-EN-P - February 2015 165
Protective Trip and Warning Functions Chapter 6
Table 202 - L2 Under Current Trip Level Parameter 270)
L2 Under Current Warning
The E300 Electronic Overload Relay indicates an L2 Under Current warning if:
• No warning currently exists
• 2 Under Current Warning is enabled
• Current is present
• The Under Current Inhibit Timer has expired
• 2 Percent FLA (Parameter 48) is less than the L2 Under Current Warning
Level
When the L2 Under Current Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 9-short blink pattern
• Bit 8 in Current Warning Status (Parameter 10) sets to 1
• Bit 1 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Warning Alarm close
L2 Under Current Warning Level
L2 Under Current Warning Level (Parameter 271) allows you to define the
current at which the E300 Electronic Overload Relay indicates a L2 Under
Current warning. It is user-adjustable from 10…100% for the FLA Setting
(Parameter 171).
Default Value 35
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %FLA
The Under Current 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
undercurrent condition until the Under Current Inhibit Time expires.
For any given application, the practical limit of the L2 Under Current Trip Level
(Parameter 270) is dependent on the FLA Setting and the lower limit of the
E300 Electronic Overload Relay’s current measurement capability
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