Rockwell Automation Allen-Bradley E300, User Manual

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Rockwell Automation Publication 193-UM015D-EN-P - February 2015 189
Protective Trip and Warning Functions Chapter 6
Table 228 - Under Voltage Trip Level (Parameter 357)
Under Voltage Warning
The E300 Electronic Overload Relay indicates an Under Voltage warning if:
• No warning currently exists
• Under Voltage Warning is enabled
• Voltage is present
• Under Voltage
• Inhibit Time has expired
• The minimum phase voltage is equal to or less than the Under Voltage
Warning Level
When the Under Voltage Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 1-long / 1-short blink pattern
• Bit 0 in Voltage Warning Status (Parameter 11) sets to 1
• Bit 1 in Device Status 0 (Parameter 20) sets to 1
• Any relay outputs configured as a Warning Alarm close
Under Voltage Warn Level
Under Voltage Warn Level (Parameter 358) allows you to define the voltage at
which the E300 Electronic Overload Relay indicates a warning. It is user-
adjustable from 0…6553.5 volts.
Table 229 - Under Voltage Warn Level
Default Value 100.0
Minimum Value 0.0
Maximum Value 6553.5
Parameter Type UINT
Size (Bytes) 2
Scaling Factor 10
Units Volts
IMPORTANT
The Under Voltage Inhibit Time starts after a phase voltage transitions from 0V
to 20V L-L. The E300 Electronic Overload Relay does not begin monitoring for
an under voltage condition until the Under Voltage Inhibit Time expires.
Default Value 400.0
Minimum Value 0.0
Maximum Value 6553.5
Parameter Type UINT
Size (Bytes) 2
Scaling Factor 10
Units Volts