Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 36)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 37
Protective Trip and Warning Functions Chapter 3
Overcurrent Warning
The EC4 Current Monitoring Relay will issue a warning with an overcurrent
condition if:
• The current in any of the phases exceeds the current specified for the
corresponding OC Warn Level parameter (Parameter 120 for L1,
parameter 123 for L2, & parameter 126 for L3)
• No warning condition already exists
If an overcurrent warning parameter is satisfied, the following will occur:
• The TRIP/WARN LED will flash a yellow blinking pattern depending on
which phase encountered the overcurrent warning condition
–
5 blinks for L1 overcurrent
– 6 blinks for L2 overcurrent
– 7 blinks for L3 overcurrent
• Parameter 15, Warning Status, will change
– Bit 4 will go to "1" for L1 overcurrent
– Bit 5 will go to "1" for L2 overcurrent
– Bit 6 will go to "1" for L3 overcurrent
• Bit _ in Parameter 21, Device Status, will go to "1"
Overcurrent Trip
The EC4 Current Monitoring Relay will trip with an overcurrent indication if:
• The current in any of the phases exceeds the current specified for the
corresponding OC Trip Level parameter (Parameter 118 for L1, parameter
121 for L2, & parameter 124 for L3)
• No trip currently exists
If the EC4 Current Monitoring Relay trips on an overcurrent condition, the
following will occur:
Table 11 - Overcurrent Setting Ranges
Current Range [A] Min. [A] Max. [A] Default [A]
0.4…2 0.4 2.5 0.4
1…5 1 6.25 1
3…15 3 18.75 3
5…25 5 31.25 5
9…45 9 56.25 9
18…90 18 112.5 18
9…5000 9 6250 9