Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 75)

76 Rockwell Automation Publication 193-UM011A-EN-P - September 2010
Chapter 5 Programmable Parameters
Output Setup Group
EC4 is normal – no trip present
In normal operation, the EC4 Current Monitoring Relay firmware latches Out A
and Out B commands received through Polled I/O and Explicit messaging. The
latched states are applied to the outputs until the next command is received.
EC4 is tripped
In the event of a protection trip, the state of an EC4 Current Monitoring Relay
output is determined by the programmed settings of the corresponding
Out_ Pr
FltState and Out_ Pr FltValue parameters. When Out_ Pr FltState is set to
“Ignore Fault”, output operation continues to respond to message commands.
When
Out_ Pr FltState is set to “Go to FltValue”, the output commanded states
are determined by the settings of the Out_ Pr FltValue parameters.
The EC4 current monitoring relay sets the firmware latch to the Out_ Pr FltValue
when Out_ Pr FltState is set to “Go to FltValue” while the EC4 Current
Monitoring Relay is in a tripped state.
EC4 is reset from trip
After an EC4 Current Monitoring Relay is returned to normal following a trip
reset, operation of Out A and Out B is determined by the state of the firmware
latch.Table 19 provides further illustration.
IMPORTANT The parameters in the Output Setup Group provide great flexibility in
terms of output relay(s) operation under the conditions of Protection
Faults, Comm Fault, and Comm Idle. It is important, therefore, that the
installer fully understands the use of these parameters, their
interaction with Parameter 24, Trip Enable, and the order of priority.
Order of Priority: The Out_Pr FltState parameter settings take
priority over the other settings.
If Comm Fault and Comm Idle are enabled (set to 1) in Trip Enable, the
state that the output(s) assumes is first determined by the settings in
the Out_Pr FltState and Out_PrFltValue parameters. If Out_Pr FltState
is set to 1 = ignore fault, the state of the output(s) will be determined
by the Out_DN FltState and Out_DN FltValue, and Out_DN IdlState
and Out_DN IdlValue settings.
If Comm Fault and Comm Idle are disabled (set to 0) in Trip Enable, the
state that the output(s) assumes will be determined by the Out_DN
FltState and Out_DN Flt Value, and Out_DN IdlState and Out_DN
IdleValue settings.