Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 42)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 43
Protective Trip and Warning Functions Chapter 3
Parameter 46, UL Trip Delay, allows the installer to define the time period that an
underload condition must be present before a trip occurs. It is adjustable from
0.1…25.0 seconds.
Parameter 47, UL Trip Level, allows the installer to define the current at which
the EC4 Current Monitoring Relay will trip on an Underload.
Communication Fault
Protection A disruption of the communication link between the EC4 Current Monitoring
Relay and a DeviceNet network can result in the loss of application control
and/or critical process diagnostic data. Rapid communication fault detection
helps minimize potential damage due to uncontrolled or unmonitored
applications.
Comm Fault Trip
The EC4 Current Monitoring Relay will trip with a Comm Fault indication if:
• No trip currently exists
• Comm Fault protection is enabled
• The EC4 Current Monitoring Relay experiences a loss of communication
If the relay trips on a Comm Fault, the following will occur:
• The Network Status LED will blink red or become solid red
• The TRIP/WARN LED will flash a red 10-blink pattern
• Bit 9 in Parameter 14, Trip Status, will go to “1”
• Bit 0 in Parameter 21, Device Status, will go to “1”
• The Trip Relay contacts will open
• The outputs will be placed in their Protection Fault State (if so
programmed)
IMPORTANT The underload inhibit timer starts after the maximum phase of load
current transitions from 0 A to 30% of the device’s minimum FLA Setting.
The EC4 Current Monitoring Relay does not begin monitoring for an
underload condition until the UL Inhibit Time expires.
IMPORTANT For any given application, the practical limit of UL Trip Level (Parameter
47) will be dependent on the FLA setting and the lower limit of the EC4
Current Monitoring Relay’s current measurement capability. See Table 20
- on page 83.
IMPORTANT The Protection Fault State of OUT A and OUT B is defined by Parameter
65 (OUTA Pr FltState), Parameter 66 (OUTA Pr FltValue), Parameter 71
(OUTB Pr FltState), and Parameter 72 (OUTB Pr FltValue).