Programmable FSK Powerline Carrier System
RFL Electronics Inc.
(973) 334-3100
June 21, 2002
RFL 9780
Publication No. PI9780
1
Figure 1. Typical RFL 9780 Programmable FSK Powerline Carrier
The RFL 9780 is a Programmable frequency-shift keyed
(FSK) power line carrier system, which can be supplied
as a transceiver (Tx/Rx), Transmit-only (Tx), Receive-only
(Rx), dual transmitter (Tx/Tx), or dual receiver (Rx/Rx). All
versions are available with redundant power supplies. The
RFL 9780 is the next generation of the field-proven Se-
ries 6780P, with enhanced features to meet today’s mar-
ket demands. These features include improved RFI and
Surge Withstand Capabilities (meeting the requirements
of ANSI/IEEE C93.5), ESD protection (per IEEE PC
37.90.3, draft A, 1/8/99) and increased flexibility through
field-programmable frequencies and logic.
Typical applications for the 9780 include Direct Transfer
Trip (DTT-single or dual channel), Permissive Transfer Trip
(PTT), Directional Comparison Unblocking (DCU), and
dual phase comparison. For protective relaying applica-
tions, the universal I/O capabilities of the RFL 9780 allow
its use with all protective relay designs currently in use,
as well as many vintage relays. Often a 9780 can be config-
ured as a direct drop-in replacement for an older PLC set.
The unit has a front panel direct reading (in dB) digital
meter to indicate signal strength. Numerous indicators
are available on the front panel to provide the user with
an ‘at-a-glance’ indication of system status. The major
status signals within the chassis are constantly monitored
by an optional sequence of events (SOE) module. This
module detects and records any changes in the system
status. The SOE log may be downloaded via an RS-232
connection (both front and rear connections provided)
to provide a time and date stamped record of events.
The RFL 9780 has an extensive number of user program-
mable features. A two frequency transmitter may be
configured for 1W/1W, 1W/10W, or 10W/10W operation
(additional modes are available for three frequency op-
eration). The receive logic boasts a comprehensive ar-
ray of programmable functions.
A complete RFL 9780 transceiver is provided in a single
chassis. It is 3 rack units high (5.25 inches, or 13.3 cm).
The Tx, Rx, Rx/Rx and Tx/Tx systems are also available
in a single 3 rack unit high chassis. A block diagram for
a typical RFL transceiver station appears in Figure 2.
Mounting dimensions for the RFL 9780 are given in
Figure 5.
RFL 9780
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