Specifications

Page 14–10
FOCUS System Manual
14.4 Specifications
The features supported by version of PRI/PRS
Modules are shown in Table 14-1. Keying thresh-
olds/versions are shown in Tables 14-2 & 14-3.
And the Protective Relay Interface (PRI/PRS)
Module’s technical specifications are shown in
Table 14-4.
14.4.1 Status Indicators
This module has 11 status indicators, as shown in
Figure 14-9. The red/green status LED is green if
the module is functional and red if the module is
non-functional (or has been inserted into the
wrong slot of a locked chassis). The remaining 10
LEDs, beginning at the top left, work as follows:
TRIP 1 IN – This green LED, when lit, indicates
that a keying input is being applied to circuit 1.
TRIP 1 OUT – This green LED, when lit,
indicates that circuit 1 is receiving a legitimate
trip command from another (remote) chassis.
The remaining 6 trip LEDs are functionally the
same except they indicate trip activity for circuits
2, 3 & 4.
BLOCK– This red LED, when lit, indicates that a
block condition exists. The cause can be that the
module is receiving bad data or T1/E1 carrier line
noise, the FOCUS chassis itself is out of synchro-
nism, or some other related malfunction. The bad
data may be the result of incorrect mapping,
where the PRI time slot is not mapped to the PRI
at the remote end or contains the wrong address.
GUARD – This green LED, when lit, indicates
that the module is receiving a guard signal. This
means that it has a good channel and is not
receiving any trip commands.
The Protective Relay Interface (PRI or PRS)
module’s rear interface has been redesigned to add
increased tolerance to transients. Four MOVs
(Metal Oxide Varistor) have been added to
increase the threshold keying for each keying
circuit to greater than 50% of high battery voltage.
The surge ground was also redesigned to be
isolated from the chassis ground. A dedicated
stranded copper wire, 12 awg or larger, should be
used to connect the ground bus to the new ground
stud. (Braided wire is preferred).
Ordering of the new PRI Module Interface has
also changed. When a customer places an order
including any PRI modules, the keying voltage
must be specified since each PRI module interface
is now voltage specific. All four inputs must be
ordered as the same dc voltage. Choices are:
Keying
Voltage Threshold
• 48/60Vdc > 35 volts
• 110/125Vdc > 75 volts
• 220/250Vdc > 145 volts
Table 14–3. PRS Module/Interfaces Versions
Style No. Nominal Order as
F020-PRIIF-001 48/60 PRI-A-48
F020-PRIIF-002 110/125 PRI-A-125
F020-PRIIF-003 220/250 PRI-A-250
F020-PRIIF-001 48/60 PRI-M-48
F020-PRIIF-002 110/125 PRI-M-125
F020-PRIIF-003 220/250 PRI-M-250
Table 14–2. PRI Module/Interface Versions
Style No. Nominal Order as
F020-PRIIF-001 48/60 PRS-A-48
F020-PRIIF-002 110/125 PRS-A-125
F020-PRIIF-003 220/250 PRS-A-250
F020-PRIIF-001 48/60 PRS-M-48
F020-PRIIF-002 110/125 PRS-M-125
F020-PRIIF-003 220/250 PRS-M-250