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Wiring Diagrams (Continued)
1. Pulse output, alarm output, and contact input/output cables must not be in close proximity or bundled with power cables or
high-voltage cables. When laid parallel, separate by the distance shown in the following table.
Power lines under 600V/600A
2. Analog output cables must not be in close proximity or bundled with other power cables or input cables (e.g., VT, CT, auxiliary
power supply). In addition, to prevent noise, surge and induction, use shielded cables or twisted-pair cables. Make sure that
cables are as short as possible.
3. There is no insulation between the MODBUS
ME-0040C-SS96 or ME-0000MT-SS96.
4. Use only designated cables when connecting the CC-Link (see communication specifications). CC-Link dedicated cables
cannot be used at the same time as CC-Link dedicated high-performance cables. Normal data transmission cannot be
guaranteed if used at the same time.
The terminal resistance value varies depending on the type of dedicated cable.
5. For cables connecting the CC-Link, connect shielded cables to "SLD" and ground "FG" cables. "SLD" and "FG" cables are
connected inside the unit.
6. CC-Link transmission lines are small signal circuits: separate from strong electrical circuits by a distance of 10cm or more, or
Note
30cm or more if laid in parallel over a long distance.
Ground the terminal before use.
7. For CC-Link transmission, always use dedicated lines and comply with conditions for total wiring distance, distance between
stations and terminal resistance values according to the communication speed. Not doing so may prevent normal communica-
tion (see the CC-Link Master Unit Operations Manual for information on dedicated lines and wiring conditions).
8. The terminal resistance supplied with the CC-Link Master Unit must always be used for the units at both ends of the CC-Link
transmission line. If the meter is at the end of the CC-Link transmission line, connect it between the DA and DB terminals.
9. Communication errors may occur under the influence of high-frequency noise from other devices in the installation environ-
ment during high-speed communication (100 Mbps) via 100BASE-TX connection of MODBUS
Measures to be taken when the network system is configured to avoid the influence of high-frequency noise are shown below.
(1) Wiring connection
• When laying a twisted pair cable, do not bundle the cable together with any main circuit line or power line or lay it close to such a line.
• Keep the twisted pair cables in the duct.
(2) Communication method
• Increase the number of communication retries as needed.
• Replace the hub to be used for connection with that for 10 Mbps, and communicate at a data transmission speed of 10 Mbps.
10. Do not connect any terminal or RJ45 connector in the live state.
11. Do not insert or remove the SD memory card in the live state.
Rated voltage for each phase/wire system
Phase/Wire
Connection
Three phase 4-wire
Star
Delta
Three phase 3-wire
Star
Single phase 3-wire
−
Delta
Single phase 2-wire*
Star
* The circuit derived from the three-phase 3-wire delta connection and the single-phase 2-wire transformer circuit have the maximum rating of 220 VAC.
The circuits derived from the three-phase 4-wire and three-phase 3-wire star connections and single-phase 3-wire connection have the maximum rating of 440 VAC.
Fig. 1. Three phase 4-wire (star)
Fig. 4. Single phase 3-wire
Condition
Distance
More than 30cm
Other power lines
More than 60cm
Rated voltage
Max. 277VAC (L-N)/480VAC(L-L)
Max. 220VAC (L-L)
Max. 440VAC (L-L)
Max. 220VAC (L-N)/440VAC(L-L)
Max. 220VAC (L-L)
Max. 440VAC (L-L)
Fig. 2. Three phase 3-wire (delta)
Fig. 5. Single phase 2-wire (delta)
RTU communication portion and the optional module ME-4210-SS96,
®
Figure
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Fig. 3. Three phase 3-wire (star)
Fig. 6. Single phase 2-wire (star)
TCP.
®
30
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