I.L. 40-201.9 Power Automation and Protection Division
1-2 REL 352 Version 1.00
Circuit descriptions for each module, may be found in Appendices A thru H, in accordance with
the list in the Preface to this document (
see “Contents of Relay System”
).
1.1 Backplane Module
The Backplane Assembly includes three voltage transformers, three current transformers, four
filter chokes and surge protection capacitors.
The Backplane Module
(see Appendix A)
receives all external connections and connects directly
to the Interconnect module, thru plug-in connectors (J11, J12, J13); and to the Relay Output
and Optoisolated Input modules, mounted on the Interconnect module (via connectors JA1,
JA2, JA3, JA4), which provide the connections between the inner and outer chassis.
The INCOM/PONI®1
(see Figure 1-3
) is mounted on the Backplate of the outer chassis and is
connected to the Backplane module (via connector J4).
1.2 Interconnect Module
The Interconnect module (
see Appendix B
) becomes the floor of the REL 352 inner chassis; it
provides electrical connections from and to all other modules: from the Backplane (at the rear),
to the Analog Input and Power Supply modules (at left and right, respectively), to the Relay Out-
put and Optoisolated Input modules in the center, and to the Microprocessor and Display mod-
ules at the front of the inner chassis.
The Interconnect module receives inputs VAG, VBG, VCG, IA, IB, ICfrom the Backplane module
and feeds them to the Analog Input module.
This module also contains the optoisolated transistor output for control of external communica-
tion equipment transmitter such as Power Line Carrier or Audio Tone.
1.3 Relay Output Module
There are three versions of this module (they are installed on the Interconnect module):
• Option
• Base 1
• Base 2 (
See Appendix C for contact output functions
)
The Option version is used for Extended Contact Output requirements.
1.4 Optoisolated Input Module
This module provides an opto-isolated interface between:
• Optoisolated inputs contaminated by external noise, and
Logic level inputs to the Microprocessor module
(
See Appendix D for more details
)
• Binary inputs from PLC (Audio Tone) communication receiver such as MARK, SPACE and
CHANNEL Failure.
1.
“INCOM”
stands for INtegrated COMmunications, a product of The Westinghouse Electric Corporation. The “PONI”
acronym stands for Product Operated Network Interface.
