Rockwell Automation Allen-Bradley E300

Rockwell Automation Publication 193-UM015D-EN-P - February 2015 159
Protective Trip and Warning Functions Chapter 6
Table 195 - Current Imbalance Trip Level (Parameter 261)
Current Imbalance Warning
The E300 Electronic Overload Relay indicates a current imbalance warning if:
• No warning currently exists
• Current Imbalance Warning is enabled
• Current is present
• Current Imbalance Inhibit Time has expired
• The current imbalance (parameter 52) is greater than the Current
Imbalance Warning Level
When the Current Imbalance Warning conditions are satisfied, the:
• TRIP/WARN LED flashes a yellow 7-short blink pattern
• Bit 6 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
Current Imbalance Warning Level
Current Imbalance Warning Level (Parameter 262) allows you to define the
percentage at which the E300 Electronic Overload Relay indicates a warning. It is
user-adjustable from 10…100%.
Table 196 - Current Imbalance Warning Level (Parameter 262)
Default Value 35
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %
IMPORTANT
The Current Imbalance Inhibit Timer starts after a 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 a current
imbalance condition until the Current Imbalance Inhibit Time expires.
Default Value 20
Minimum Value 10
Maximum Value 100
Parameter Type USINT
Size (Bytes) 1
Scaling Factor 1
Units %