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 75)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 75
Protective Trip & Warning Functions Chapter 3
Real Power (kW)
Protection
The E3 Plus Model EC5 has the capability to protect against real power (kW) for
specific applications that require the monitoring of both voltage and current. The
user can protect or issue a warning in the event that the real power (kW)
consumption of an electric motor is either too high or too low.
Under Real Power Trip
The E3 Overload Relay will trip with an under real power indication if:
• no trip currently exists,
• Under Real Power protection is enabled,
• UW Inhibit Time has expired, and
• Total Real Power is equal to or less than UW Trip Level for a time period
greater than the programmed UW Trip Delay.
When the under real power trip conditions are satisfied, the:
• TRIP/WARN LED will flash a red 2 long and 1 short blink pattern,
• bit 0 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).
UW Inhibit Time, Parameter 241, allows the installer to inhibit an under real
power trip from occurring during the motor starting sequence and is adjustable
from 0…250 seconds.
UW Trip Delay, Parameter 242, allows the installer to define the time period an
under real power condition must be present before a trip occurs. It is adjustable
from 0.1…25.0 seconds.
UW Trip Level, Parameter 243, allows the installer to define the total real power
in which the E3 Plus Overload Relay will trip. It is adjustable from 0…32767.
Under Real Power Warning
The E3 Overload Relay will immediately indicate an under real power warning
condition if:
• no warning currently exists,
• Under Real Power Warning is enabled,
• UW Inhibit Time has expired, and
• Total Real Power is equal to or less than the UW Warn Level.
When the under real power warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 2 long and 1 short blink pattern,