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Instruction Booklet IB02402001E
December 2010
Instructions for the Eaton Type
MPCV Network Protection Relay
EATON CORPORATION www.eaton.com
For more information visit: www.EatonElectrical.com IB02402001E
Instruction Bulletin
Page 20 Effective: September 2004
Instruction for the
Cutler-Hammer Type MPCV
Network Protection Relay
Wiring Configurations
The architecture for an IMPACC system allows all of the
following:
1. Devices wired in a “daisy chain” fashion
2. Devices wired in a “simple tap” fashion
3. Devices organized as a “complex tap”
4. Devices in a subnetwork under a “submaster”
The MASTER — is the only device on a Main Network,
which issues command signals. All other devices on a Main
Network respond to commands from the master addressed to
those devices.
A MASTER may be any of the following:
1. CONI
2. MINT
3. NetLink
The SUBMASTER — is the only device on a subnetwork, which
issues command signals. It appears as a single device to the
Main Network and responds to commands by the MASTER.
The NODE — is an IMPACC compatible device that receives
commands from the MASTER and/or SUBMASTER and
executes the command.
The MAIN RUN — is a length of cable more than 200 feet
(61 m) on which the MASTER or SUBMASTER resides.
The EOLTR — an End of Line Termination Resistor used
to eliminate reflections and provide a load into which the
INCOM transceiver can drive its signal.
The DAISY CHAIN — a cable layout where all nodes appear
as parallel loads across a single run of shielded twisted wire.
Figure 8. Daisy Chain
The SIMPLE TAP — a Short Run cable which physically “Ts”
off a Main Run and has one Node at the end. The Short Run
of cable can be a maximum of 200 feet (61 m) an No EOLTRs
are used within a Simple Tap.
Figure 9. Simple Tap
EOLTR
Node 1
Node 2
Node 3
EOLTR
Master
Main Run
Master
Node
1
200 Feet
Maximum
EOLTR
Main Run
EOLTR
Simple Tap
Node
2
Node
3
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