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 69)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 69
Protective Trip & Warning Functions Chapter 3
OV Trip Level, Parameter 221, allows the installer to define the average L-L
voltage in which the E3 Plus Overload Relay will trip. It is adjustable from
0…65535 V.
Over Voltage (OV) Warning
The E3 Overload Relay will immediately indicate an over voltage warning
condition if:
• no warning currently exists,
• OV Warning is enabled,
• OV Inhibit Time has expired, and
• Average Voltage L-L is equal to or greater than the OV Warn Level.
When the under voltage warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 1 long and 3 short blink pattern,
• bit 2 in V Warning Status, Parameter 161, will set to “1”, and
• bit 1 of Device Status, Parameter 21, will set to “1”.
OV Warn Level, Parameter 222, allows the installer to define the average L-L
voltage in which the E3 Plus Overload Relay will indicate a warning and is
adjustable from 0…65535 V.
Voltage Unbalance
Protection
An unbalance in the voltage supply will create an unequal motor winding
impedance resulting in a current imbalance. This causes the motor to experience
an additional temperature rise, resulting in degradation of the motor insulation
and reducing its life expectancy. Voltage Unbalance detection helps extend motor
life expectancy and minimize potential damage and loss of production.
Voltage Unbalance can be defined by the following equation:
%VU = 100% * (V
d
/V
a
)
where:
%VU = Percent Voltage Unbalance
V
d
= Maximum Deviation from the Average Voltage
V
a
= Average Voltage
Voltage Unbalance Trip
The E3 Overload Relay will trip with a Voltage Unbalance indication if: