Rockwell Automation 592- E300 Overload Relay User Manual - Manual (Page 158)

158 Rockwell Automation Publication 193-UM015B-EN-P - June 2014
Chapter 5 Protective Trip and Warning Functions
Table 151 - UnderkW Trip Level (Parameter 380)
Under kW Warning
The E300 Electronic Overload Relay will indicate 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
Level
When the Under kW Warning conditions are satisfied, the:
• TRIP/WARN LED will flash a yellow 2-long / 1-short blink pattern
• Bit 0 in Power Warning Status (Parameter 12) will set to 1
• Bit 1 in Device Status 0 (Parameter 20) will set to 1
• Any relay outputs configured as a Warning Alarm will close
Under kW Warn Level
Under kW Warn Level (Parameter 381) allows the user to define the real power
(kW) at which the E300 Electronic Overload Relay will indicate 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
IMPORTANT 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 0A to 30% of the device’s
minimum FLA setting. The E300 Electronic Overload Relay does not begin
monitoring for an under real power (kW) condition until the Under kW Inhibit
Time expires.