Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 82)

82 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 3 Protective Trip & Warning Functions
Under Apparent Power Trip
The E3 Overload Relay will trip with an under apparent power indication if:
• no trip currently exists,
• Under Apparent Power protection is enabled,
• UVA Inhibit Time has expired, and
• Total Apparent Power is equal to or less than UVA Trip Level for a time
period greater than the programmed UVA Trip Delay.
When the under apparent power trip conditions are satisfied, the:
• TRIP/WARN LED will flash a red 2 long and 7 short blink pattern,
• bit 6 in Parameter 227, PW Trip Status, will set to “1”,
• bit 0 of Parameter 21, Device Status, will set to “1”,
• Trip Relay contact will be open, and
• outputs will be placed in their Protection Fault state (if so programmed).
UVA Inhibit Time, Parameter 265, allows the installer to inhibit an under
apparent power trip from occurring during the motor starting sequence and is
adjustable from 0…250 seconds.
UVA Trip Delay, Parameter 266, allows the installer to define the time period an
under apparent power condition must be present before a trip occurs. It is
adjustable from 0.1…25.0 seconds.
UVA Trip Level, Parameter 267, allows the installer to define the total apparent
power in which the E3 Plus Overload Relay will trip. It is adjustable from
0…32767.
Under Apparent Power Warning
The E3 Overload Relay will immediately indicate an under apparent power
warning condition if:
• no warning currently exists,
• Under Apparent Power Warning is enabled,
• UVA Inhibit Time has expired, and
• Total Apparent Power is equal to or less than the UVA Warn Level.
When the under apparent power warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 2 long and 7 short blink pattern,
• bit 6 in PW Warn Status, Parameter 228, will go to “1”, and
• bit 1 of Device Status, Parameter 21, will go to “1”.