Application
As noted previously, the MBT9600 is
designed for use with SEL protective
relays using "mirrored bits" relay-to-
relay logic communications. Figure 2
shows a typical application.
The MBT9600 meets or exceeds all
applicable ANSI,
IEEE,
and IEC
standards.
Application specific features set the
MBT9600 apart from conventional high-
speed modems. Conventional modems
typically have retrain times in excess of
15 seconds and absolute data delays in
excess of 25 milliseconds. These critical
parameters make conventional modems
unusable for pilot relaying applications.
The MBT9600’s compact size and ease of instal-
lation make it an ideal low-cost alternative to
conventional audio tone teleprotection systems.
The circuitry is ideally suited for use over private
networks such as conventional voice channels
over analog microwave.
Installation
These installation instructions tell you how to
install the MBT9600 for use with an SEL mirrored
bit relay and a microwave voice channel.
Hardware Installation/Connections
To install the MBT9600, complete the following
four steps:
1. Plug the MBT9600’s DB9 male connector
into Serial Port 2 on the rear of the relay
and tighten the retention screws finger
tight.
2. Connect the two “transmit,” or output,
wires from the voice channel device to the
“RX” terminals on the MBT9600 using
twisted, shielded pair cables.
3. Connect the two “receive,” or input, wires
from the voice channel device to the “TX”
terminals on the MBT9600 using twisted,
shielded pair cables.
4. Connect one end of a ground wire to the
“Gnd” terminal on the MBT9600 and the
other end to the “GND” terminal on the
rear of the relay. Also connect the cable
shield to the relay’s GND terminal. ALL
OF THESE GROUNDS MUST BE
CONNECTED BEFORE USE.
Note: Connect the cable shield to ground
only at one end.
5. Once the system is in full operation with
the communications path established,,
Target 20 of the SEL 321 will read “ROK”
indicating that the mirrored bits are
working properly.
The MBT9600 is now ready for operation.
Page 2
September 1997
Technologies, Inc.
Figure 3. MBT9600 DB9 Male Connector Pin Assignments.
Summary of Contents for MBT9600
Page 2: ......
