Rockwell Automation Allen-Bradley E300, User Manual

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Rockwell Automation Publication 193-UM015D-EN-P - February 2015 177
Protective Trip and Warning Functions Chapter 6
When the L2 Over Current Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 13-short blink pattern
• Bit 12 in Current Warning Status (Parameter 10) sets to 1
• Bit 1 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Warning Alarm closes
L3 Over Current Warning Level
L3 Over Current Warning Level (Parameter 284) allows you to define the current
at which the E300 Electronic Overload Relay indicates a L3 Over Current
warning. It is user-adjustable from 10…100% for the FLA Setting (Parameter
171).
Table 216 - L3 Over Current Warning Level (Parameter 284)
Line Loss Protection
For non-motor applications when the measured current is 0 amps a specific
phase, this may indicate an electrical malfunction such as bad resistive heater
element or non-operating incandescent light bulb. Such conditions may not
harm the power system, but it can lead to loss of production or certification
noncompliance.
The E300 Electronic Overload Relay can monitor for a current-based line loss
per phase with its Line Loss Trip and Warning function to detect for a rapid line
loss in a specific phase to minimize damage and loss of production.
Line Loss Inhibit Time
Line Loss Inhibit Time (Parameter 285) allows you to inhibit an L1, L2, and L3
Line Loss trip and warning from occurring during a load starting sequence. It is
adjustable from 0…250 seconds.
Default Value 90
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %FLA
IMPORTANT
The L3 Over Current Warning function does not include a time delay feature.
Once the Over Current Inhibit Timer has expired, the L3 Over Current Warning
indication is instantaneous.