User Manual

70 Rockwell Automation Publication 193-UM002I-EN-P - December 2011
Chapter 3 Protective Trip & Warning Functions
• no trip currently exists,
• Voltage Unbalance protection is enabled,
• V UnbalInhibitTime has expired, and
• Volt Unbalance is equal to or greater than the V UnbalTripLevel for a time
period greater than the V UnbalTripDelay.
If the relay trips on a Voltage Unbalance, the:
• TRIP/WARN LED will flash red a 1 long and 4 short blink pattern,
• bit 3 in V Trip Status, Parameter 160, will set to “1”,
• bit 0 in Device Status, Parameter21, will set to “1”,
• Trip Relay contacts will open, and
• outputs will be placed in their Protection Fault State (if so programmed).
V UnbalInhibitTime, Parameter 229, allows the installer to inhibit a voltage
unbalance trip from occurring during the motor starting sequence. It is adjustable
from 0…250 seconds.
V UnbalTripDelay, Parameter 230, allows the installer to define the time period
for which a voltage unbalance condition must be present before a trip occurs. It is
adjustable from 0.1…25.0 seconds.
V UnbalTripLevel, Parameter 231, allows the installer to define the percent
voltage unbalance which will cause the relay to trip on a voltage unbalance. It is
adjustable from 0…100%.
Voltage Unbalance Warning
The E3 Overload Relay will indicate a Voltage Unbalance warning if:
• no warning currently exists,
• Voltage Unbalance warning is enabled,
• VUnbalInhibitTime has expired, and
• Volt Unbalance is equal to or greater than V UnbalWarnLevel.
When the Voltage Unbalance warning conditions are satisfied, the:
• TRIP/WARN LED will flash an amber 1 long and 4 short blink pattern,
• bit 3 in V Warn Status, Parameter 161, will set to “1”, and
• bit 1 in Device Status, Parameter 21, will set to “1”.
V UnbalWarnLevel, Parameter 232, allows the installer to define the percent
voltage unbalance in which the E3 Overload Relay will indicate a warning. It is
user-adjustable from 0…100%.