Rockwell-automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Pl User Manual Page 84

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84 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 3 Protective Trip & Warning Functions
bit 7 in PW Warn Status, Parameter 228, will go to “1”, and
bit 1 of Device Status, Parameter 21, will go to “1”.
OVA Warn Level, Parameter 272, allows the installer to define the total apparent
power in which the E3 Plus Overload Relay will indicate a warning and is
adjustable from 0…32767.
Power Factor Protection
The E3 Plus model EC5 has the capability to protect against power factor (PF)
for specific applications that require the monitoring the phase angle difference
between voltage and current. The user can protect or issue a warning in the event
that the power factor for an electric motor is either too high or too low for both
leading and lagging applications.
Under Power Factor Lagging Trip
The E3 Overload Relay will trip with an under power factor lagging indication if:
no trip currently exists,
Under Power Factor Lagging protection is enabled,
UPFLG Inhibit Time has expired, and
Total PF is equal to or less than UPFLG Trip Level for a time period
greater than the programmed UPFLG Trip Delay
When the under power factor lagging trip conditions are satisfied, the:
TRIP/WARN LED will flash a red 2 long and 9 short blink pattern,
bit 8 in PW Trip Status, Parameter 227, 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).
UPFLG Inhibit Time, Parameter 273, allows the installer to inhibit an under
power factor lagging trip from occurring during the motor starting sequence and
is adjustable from 0…250 seconds.
UPFLG Trip Delay, Parameter 274, allows the installer to define the time period
an under power factor lagging condition must be present before a trip occurs. It is
adjustable from 0.1…25.0 seconds.
UPFLG Trip Level, Parameter 275, allows the installer to define the total power
factor lagging in which the E3 Plus Overload Relay will trip. It is adjustable from
0…32767.
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