Connecting The Power Line And M-Net Transmission Line; Connecting The Signal Lines - Mitsubishi Electric PAC-YG66DCA Instruction Manual

7-2. Connecting the Power Line and M-NET Transmission Line

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).
Circuit Onsite
(example) R
AC Power Line
S
Figure 7-1 Example of Connecting the Power Line and M-NET Transmission Line
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 M-NET indoor control line and the outdoor unit is down because, for example, the power supply
is interrupted for servicing or there is a failure, the DIDO controller cannot be controlled from the system controller.

7-3. Connecting the Signal Lines

• Separately procure the relay, power supply for the relay, terminal block, and cable locally.
• The maximum wire length is 100 m. However, since the use of long wires makes the device susceptible to noise, using
wires shorter than 10 m is recommended.
• Connect another relay within 10 m from DIDO controller to extend the input line.
Tightening torque for terminal screws: 1 N·m
M-NET
Fuse
Varistor
U
U
CN17
A/B/S
Arrester
Noise
Varistor
Filter
7
CN16
V+/V-/FG
DIDO controller
24 VDC
Power
source
* Functional
FG
ground