Rockwell Automation Publication 193-UM015D-EN-P - February 2015 241
Protective Trip and Warning Functions Chapter 6
Table 295 - Under Power Factor Leading Trip Level (Parameter 420)
Under Power Factor Leading Warning
The E300 Electronic Overload Relay indicates an Under Power Factor Leading
warning if:
• No warning currently exists
• Under Power Factor Leading Warning is enabled
• Current is present
• Voltage is present
• Under Power Factor Leading Inhibit Time has expired
• The total power factor leading is equal to or less than the Under Power
Factor Leading Warning Level
When the Under Power Factor Leading Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 2-long / 11-short blink pattern
• Bit 10 in Power Warning Status (Parameter 12) sets to 1
• Bit 1 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Warning Alarm closes
Under Power Factor Leading Warn Level
Under Power Factor Leading Warn Level (Parameter 421) allows you to define
the power factor leading at which the E300 Electronic Overload Relay indicates a
warning. It is user-adjustable from 0…2,000,000 kW.
Default Value 90
Minimum Value 100
Maximum Value 0
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %
The Under Power Factor Leading Inhibit Time starts after a phase voltage
transitions from 0V to 20V L-L and a 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 under power factor leading condition
until the Under Power Factor Leading Inhibit Time expires.
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