6
7-2. Connecting the Power Line and M-NET Transmission Line
7-3. Connecting the Sensors
• For channel 1, select one of the following four types: Pt100 detection, 4 to 20 mADC, 1 to 5 VDC, or 0 to 10 VDC analog input.
• For channel 2, select one of the following three types: 4 to 20 mADC, 1 to 5 VDC, or 0 to 10 VDC analog input.
• The wire length depends on the specifications of the sensor. However, since the use of long wires makes the device
susceptible to noise, using wires shorter than 12 m is recommended. Use a shielded line for the sensor line and connect
to the FG terminal on this unit or the FG terminal on the control panel.
(1) Channel 1 Pt100 Input
To use these, various settings need to be configured. Refer to "8 Initial Setting Procedure".
S
FG
M-NET
S / B /
A
(M1)
(M2)
U
U
R
V+/V-/FG
CN02
A/B/S
Tightening torque for terminal screws: 1 N·m
Connect the device to a power supply unit (PAC-SC50KUA) for
the transmission line or an outdoor unit (either a centralized
control line or indoor control line can be connected).
* Only the M-NET circuitry of this device receives the power from the
M-NET transmission line. The power consumption factor is "1/4"
(equivalent to one ME Remote Controller).
Figure 7-1 Example of Connecting the Power Line and M-NET Transmission Line
AI controller
Circuit Onsite
(example)
Fuse
Varistor
Arrester
Noise
Filter
24 VDC
Power
source
AC power Line
* Functional
ground
Varistor
Caution:
• Use a power line and M-NET transmission line that satisfy the specifications described in "6-1. Parts to Procured Locally".
• Attach a circuit comprising the following components to the supply primary side of the 24 VDC power supply.
(1) Varistor, (2) Arrester, (3) Noise filter, (4) Fuse
• It is important to pay attention to the polarity when connecting to the 24 VDC power supply terminal block.
Connecting the positive and negative in the reverse order will cause a failure.
• Fix the power line and M-NET transmission line in place on the outside to ensure that the terminal block is not affected by any
external force.
Not securely connecting and fixing the wires in place may cause heat generation and fire.
• Make sure that the copper wiring is not short-circuiting the plates (cover, lower case) or neighboring wires.
Cover the shielded line of the M-NET transmission line with materials such as vinyl tape and prevent short-circuiting with the plates.
Note:
• If this device is connected to an indoor/outdoor transmission line and the outdoor unit is down because, for example, the power
supply is interrupted for servicing or there is a failure, the AI controller cannot be set and monitored from the system controller.
• Be sure to ground this device, PAC-SC50KUA and 24 VDC Power source.
Measurement accuracy may be affected if devices are not grounded.
B /
B
B
A
A / B
CN10
t°
Caution:
• Use a 3-wire system for Pt100.
• A/B polarity is important for Pt100.
Be sure to match the polarity when using Pt100.
• Do not install the sensor input line parallel to or near the M-NET or power line.
Also avoid loop wiring.
Furthermore, confirm the precautions for the sensor.
• Strip 12±1 mm (15/32 ±1/32 in) of the wire coating and insert firmly into the terminal.
• Make sure that the copper wiring is not short-circuiting the plates (cover, lower
case) or neighboring wires.
• Perform wiring so that the terminal block is not strained.
If strained, use a wire guide or junction terminal to alleviate the stress on the
terminal block.
Pt100 (3-wire system)
Line Onsite
