0BOverview
1-12
Overview
z
Multiple-system configuration
Model KM1 is a system containing a maximum of six units. Multiple-system configuration can be
made via RS-485 communication.
Connecting masters to each other via RS-485 wiring can achieve various functions.
Connecting to Model KE1 can detect earth leakage or instantaneous voltage drop.
*1. For Model KE1, refer to "Model KE1 User's Manual" (SGTE-717).
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Example of multiple-system configuration
Purpose of use : Classification of energy by equipment of single-phase 3-wire system line.
Power measurements by single phase 3-wire system, 3-phase 3-wire
system, and 3-phase 4-wire system
3-phase 3-wire system earth leakage and instantaneous voltage drop
monitoring.
*2. Set slave IDs in a way to avoid duplicates within the same system.
*3. Make sure the communication protocol matches across the entire systems.
*4. Set unit numbers in a way to avoid duplicates across the entire systems.
*5. Within a system where multiple units are connected, do not use RS-485 wiring for multiple
connections.
PMU2A
(Power-two
system)
Unit No.: 01
CTD8E
(CT
expansion)
Slave ID: 1
Unit No.: 02
CTD8E
(CT
expansion)
Slave ID: 2
Unit No.: 03
CTD8E
(CT
expansion)
Slave ID: 3
Unit No.: 04
VSU1B
(Instantaneo
us voltage
drop)
Slave ID: 2
Unit No.: 08
PGR1C
(Electric
power/earth
leakage)
Unit No.: 06
CTD8E
(CT
expansion)
Slave ID: 1
Unit No.: 07
VSU1B
(Instantaneo
us voltage
drop)
Slave ID: 2
Unit No.: 08
RS-485
EMU8A
(Pulse/temp
erature)
Slave ID: 5
Unit No.: 05
1 System
1 System
1 System
* If it is included in the system above, inter-unit communication is
carried out. This makes communication slow.
This means that using it as a different system makes
communication faster.
ZCT8E
(ZCT
expansion)
Slave ID: 3
Unit No.: 09
