Rockwell Automation 865 Differential Protection Relay - Manual (Page 119)

Chapter
6
865-UM001A-EN-P – July 2009
Control Functions
Output Relays The output relays are also called digital outputs. Any internal signal
can be connected to the output relays using output matrix. An output
relay can be configured as latched or non-latched. See output matrix
for more details.
NOTE:
If the Allen-Bradley Bulletin 865 has the mA option, it is
equipped with only three alarm relays from A1 to A3.
The difference between trip contacts and alarm contacts is the DC
breaking capacity. See Chapter 9 for details. The contacts are SPST
normal open type (NO), except alarm relays A1, A2 and A3, which
have change over contacts (SPDT).
Table 6.1 – Parameters of Output Relays
Parameter Value Unit Description Note
T1, T2 0
1 Status of trip output relay F
A1 ... A5 0
1 Status of alarm output relay F
IF
0
1
Status of the internal fault indication
relay F
Force On
Off
Force flag for output relay forcing for
test purposes. This is a common flag
for all output relays and protection
stage status, too. Any forced relay(s)
and this flag are automatically reset
by a 5-minute timeout. Set
REMOTE PULSES
A1 ... A5 0.00 ... 99.98
or
99.99
s Pulse length for direct output relay
control via communications
protocols.
99.99 s = Infinite. Release by writing
"0" to the direct control parameter Set
NAMES for OUTPUT RELAYS (editable with SetPointPS only)
Description String of
max. 32
characters
Names for DO on SetPointPS
screens. Default is
"Trip relay n",
"Alarm relay n", Set
Set = An editable parameter (password needed)
F = Editable when force flag is on