Rockwell Automation Publication 193-UM015D-EN-P - February 2015 155
Protective Trip and Warning Functions Chapter 6
Table 190 - Underload Trip Delay (Parameter 256)
Underload Trip Level
Underload Trip Level (Parameter 257) allows you to define the current at which
the E300 Electronic Overload Relay trips on an underload. It is user-adjustable
from 10…100% of the FLA Setting (Parameter 171).
Table 191 - Underload Trip Level (Parameter 257)
Underload Warning
The E300 Electronic Overload Relay indicates an underload warning if:
• No warning currently exists
• Underload Warning is enabled
• Current is present
• Underload Inhibit Time has expired
• The minimum phase current is less than the Underload Warning Level
Default Value 5.0
Minimum Value 0.1
Maximum Value 25.0
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 10
Units Seconds
Default Value 50
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %FLA
The Underload Inhibit Timer starts after the maximum phase of load current
transitions from 0 A to 30% of the minimum fla SETTING of the device. The
E300 Electronic Overload Relay does not begin monitoring for an underload
condition until the Underload Inhibit Time expires.
For any given application, the practical limit of the Underload Trip Level
(Parameter 246) is dependent on the FLA Setting and the lower limit of the
E300 Electronic Overload Relay’s current measurement capability.
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