Rockwell Automation 193-EPRB Profibus Side Mount Module for the E1 Plus Overload Relay User Manual - Manual (Page 12)

Publication 193-UM010A-EN-P – January 2008
2-4 Protection Functions
Underload Warning
The following parameters are available for configuring the PROFIBUS Module's underload
warning performance:
• Parameter 17, UL Inhibit Time, allows the installer to inhibit an underload indication
from occurring during the motor starting sequence. It is adjustable from 0…250
seconds.
• Parameter 18, UL Warn Level, allows the installer to define the current at which the
PROFIBUS Module will indicate a warning. It is user-adjustable from 30…100% of the
FLA dial setting.
The PROFIBUS Module will immediately indicate an Underload warning if:
• No warning currently exists
• Underload Warning is enabled
• UL Inhibit Time has expired
• The motor current is less than the UL Warn Level
When the Underload Warning conditions are satisfied, the following will occur:
• Bit 3 in Parameter 4, Warning Status, will go to “1”
• Bit 1 of Parameter 5, Device Status, will go to “1”
Communication Fault
Protection
A disruption of the communication link between the E1 Plus PROFIBUS Module and a
PROFIBUS 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 Warning
The PROFIBUS Module will indicate a Comm Fault warning if:
• No warning currently exists
• Comm Fault Warning is enabled
• The PROFIBUS Module experiences a loss of communication
When the Comm Fault warning conditions are satisfied, the following will occur:
• The Network Status LED will go out
• Bit 5 in Parameter 4, Warning Status, will go to “1”
• Bit 1 of Parameter 5, Device Status, will go to “1”
Communication Idle Protection When a programmable controller is placed into the program mode, the execution of its ladder
program is suspended, and any connected networks go to an idle state. If inadvertent, this can
result in the loss of application control and/or critical process diagnostic data. Rapid
IMPORTANT
The Underload Warning function does not include a time delay feature.
Once the UL Inhibit Time has expired, the Underload warning indication
is instantaneous.
IMPORTANT
The Comm Fault State of OUT A is defined by Parameter 24 (OUTA Pb
FltState) and parameter 25 (OUTA Pb FltValue).