Specifications
Page 18–6
FOCUS System Manual
resistor (PTC), which acts as a fuse for the
64KFE.
(Please see the following section for complete
installation instructions.) Because the 64KFE is
powered directly from the relay port, no external
power supplies are required, and the chance of
outside interference is further limited.
Figure 18–5.
Parts Supplied with the 64KFE Modification Kit
18.6.3 64KFE Installation
These installation instructions tell you how to
install the 64KFE interface on an operational
FOCUS chassis and how to make the necessary
modifications to your RFL 9300 Charge
Comparison Relay using the supplied parts. For
instructions on installing the 64K Module itself,
please refer to the “Hardware Installation and
Connections” section earlier in this chapter.
18.6.3.1 64KFE Hardware Installation/
Connections
To install the 64KFE and make the necessary
modifications to the RFL 9300 charge compar-
ison relay, complete the following nine steps.
Remember to observe all electrostatic discharge
precautions when removing or inserting compo-
nents, cables, or connectors on a PC board. Refer
to the component location drawings at the end of
the chapter for the locations of R1 and C7.
1. Turn off the power to the RFL 9300 relay.
2. Remove the 97 DD I/O Module from the
back of the 9300 relay.
3. Replace the “R1” limiting resistor on the 97
DD I/O Module’s PC board with the
positive temperature coefficient resistor
(PTC) labeled “R1” from the modification
kit.
4. Replace the “C7” capacitor on the 97 DD
I/O Module’s PC board with the transient
voltage suppressor labeled “C7” from the
modification kit.
Part "R1"
Part "C7"
FOCUS
FIBER OPTICCOMMUNICATIONS FOR UTILITY SYSTEMS
CHANNEL STATUS SYSTEM STATUS
Technologies, Inc.
Technologies,Inc.
64KFE
F020-0E6MN-001
Ph. 800-785-7274
TX RX
Charge Comparison Relay
Figure 18–4. The 64KFE as a Fiber Optic Extension from FOCUS to the RFL 9300 Relay.