Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 37)

38 Rockwell Automation Publication 193-UM011A-EN-P - September 2010
Chapter 3 Protective Trip and Warning Functions
• The TRIP/WARN LED will flash a red blinking pattern depending on
which phase encountered the overcurrent
–
5 red blinks for L1 overcurrent
– 6 red blinks for L2 overcurrent
– 7 red blinks for L3 overcurrent
• Parameter 14, Trip 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 0 in Parameter 21, Device Status, will go to "1"
• The outputs will be placed in their Protection Fault state (if so
programmed)
Ground Fault Protection In isolated or high impedance-grounded systems, core-balanced current sensors
are typically used to detect low level ground faults caused by insulation
breakdowns or entry of foreign objects. Detection of such ground faults can be
used to interrupt the system to prevent further damage, or to alert the
appropriate personnel to perform timely maintenance.
The EC4 Current Monitoring Relay provides core-balanced ground fault
detection capability, with the option of enabling Ground Fault Trip, Ground
Fault Warning, or both. The ground fault detection method and range depends
upon the catalog number of the relay ordered. The EC4 can measure from
20 mA…5 A of ground fault current
➊➋ .
➊ Must use one of the followign ground fault sensors:
Cat. No. 193-CBCT1 — 20 mm diameer window
Cat. No. 193-CBCT2 — 40 mm diameer window
Cat. No. 193-CBCT3 — 65 mm diameer window
Cat. No. 193-CBCT4 — 85 mm diameer window
➋ 20…100 mA for resistive loads only. For motor load information, please consult your local Allen-Bradley
distributor.
ATTENTION: The EC4 Current Monitoring Relay is not a ground
fault circuit interruptor for personnel protection as defined in
Article 100 of the NEC.
ATTENTION: The EC4 Current Monitoring Relay is not intended to
signal a disconnecting means to open the faulted current. A
disconnecting device must be capable of interrupting the maximum
available fault current of the system on which it is used.