Rockwell Automation Publication 193-UM015E-EN-P - October 2015 389
Protective Trip and Warning Functions Chapter 6
Table 320 - UnderkW Trip Level (Parameter 380)
Under kW Warning
The E300 relay indicates an Under kW warning if:
• No warning currently exists
• Under kW Warning is enabled
• Current is present
• Voltage is present
• Under kW Inhibit Time has expired
• The total real power (kW) is equal to or less than the Under kW Warning
Lev
el
Whe
n the Under kW Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 2-long / 1-short blink pattern
• Bit 0 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 close
Under kW Warn Level
Under kW Warn Level (Parameter 381) allows you to define the real power (kW)
at which the E300 relay indicates a warning. It is user-adjustable from
0…2,000,000 kW.
Default Value 0.000
Minimum Value 0.000
Maximum Value 2,000,000.000
Parameter Type DINT
Size (Bytes) 4
Scaling Factor 1000
Units kW
The Under kW 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 relay does not begin monitoring
for an under real power (kW) condition until the Under kW Inhibit Time
expires.
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