Over frequency (of) trip, Over frequency (of) warning – Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual User Manual
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Rockwell Automation Publication 193-UM002I-EN-P - December 2011
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Protective Trip & Warning Functions Chapter 3
UF Warn Level, Parameter 236, allows the installer to define the frequency in
which the E3 Plus Overload Relay will indicate a warning and is adjustable from
0…250 Hz.
Over Frequency (OF) Trip
The E3 Overload Relay will trip with an over frequency indication if:
• no trip currently exists,
• OF Protection is enabled,
• OF Inhibit Time has expired, and
• Volt Frequency is equal to or less than OF Trip Level for a time period
greater than the programmed OF Trip Delay.
When the over frequency trip conditions are satisfied, the:
• TRIP/WARN LED will flash a red 1 long and 7 short blink pattern,
• bit 6 in V Trip Status, Parameter 160, will set to “1”,
• bit 0 of Device Status, Parameter 21, will set to “1”,
• Trip Relay contact will be open, and
• outputs will be placed in their Protection Fault state (if so programmed).
OF Inhibit Time, Parameter 237, allows the installer to inhibit an over frequency
trip from occurring during the motor starting sequence and is adjustable from
0…250 seconds.
OF Trip Delay, Parameter 238, allows the installer to define the time period an
over frequency condition must be present before a trip occurs. It is adjustable
from 0.1…25.0 seconds.
OF Trip Level, Parameter 239, allows the installer to define the frequency in
which the E3 Plus Overload Relay will trip. It is adjustable from 0…250 Hz.
Over Frequency (OF) Warning
The E3 Overload Relay will immediately indicate an over frequency warning
condition if:
• no warning currently exists,
• OF Warning is enabled,
• OF Inhibit Time has expired, and
• Volt Frequency is equal to or greater than the OF Warn Level.
When the over frequency warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 1 long and 7 short blink pattern,
• bit 6 in V Warning Status, Parameter 161, will set to “1”, and