Reactive power (kvar) protection, Under reactive power consumed trip – 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
When the over real power warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 2 long and 2 short blink pattern,
• bit 1 in PW Warn Status, Parameter 228, will set to “1”, and
• bit 1 of Device Status, Parameter 21, will set to “1”.
OW Warn Level, Parameter 248, allows the installer to define the total real power
in which the E3 Plus Overload Relay will indicate a warning and is adjustable
from 0…32767.
Reactive Power (kVAR)
Protection
The E3 Plus model EC5 has the capability to protect against reactive power
(kVAR) for specific applications that require the monitoring of the reactive
component of voltage and current. The user can protect or issue a warning in the
event that the reactive power (kVAR) consumption or generation from an electric
motor is either too high or too low. This protection can be used with
synchronous motors or motors that have an active Power Factor correction
capacitor.
Under Reactive Power Consumed Trip
The E3 Overload Relay will trip with an under reactive power consumed
indication if:
no trip currently exists,
Under Reactive Power Consumed protection is enabled,
UVARC Inhibit Time has expired, and
Total Reactive Power is equal to or less than UVARC Trip Level for a time period
greater than the programmed UVARC Trip Delay.
When the under real power trip conditions are satisfied, the:
TRIP/WARN LED will flash a red 2 long and 3 short blink pattern,
bit 2 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).
UVARC Inhibit Time, Parameter 249, allows the installer to inhibit an under
reactive power consumed trip from occurring during the motor starting sequence
and is adjustable from 0…250 seconds.