Mitsubishi Electric M Series Manual page 92

1. CONTROLS
1-12. System Control Interface [PAC-IF01MNT-E], cont.
The shielded wires of M-NET transmission should be
connected with the ground wire at any only one place
of the unit to be connected.
Bad example (Multiple ground of shielded wire)
System
controller
M-NET transmit wire
Good example (One spot ground of shielded wire)
System
controller
M-NET transmit wire
( 1) Refer to the appendix List of Models to check the applicable models.
( 2) In case that the outdoor unit is grounded, connect the ground
wire supplied as accessory to the S terminal (secondary)
of M-NET terminal block and M-NET Ground terminal inside of
electric box with using screws supplied.
( 3) If the shield and earth are grounded in two or more locations, electrical circuit is generated through them, and a potential
difference is created because of the impedance difference between or among the ground locations. This may cause noise
in the shield. Ground at only one point, then no circuit is created and no noise gets in.
1.Parts List
( 1) Refer to the appendix List of Models to check the applicable models.
3. Switch setting
No. Description
M-NET Board
Before installation
Set M-NET address on M-NET board in advance before installing on the
Fixture
electrical box.
(1) M-NET head address setting
Screw (M3 10)
The setting should be done by rotary switches SW11 and SW12
on M-NET board. (Factory settings are all Zero)
Terminal block
Make sure to set M-NET address within the range of 01 to 50. When
(M-NET)
installing two or more outdoor units, do not use the same number more
Terminal screw
than once for M-NET address.
(M4 25)
Label
(2) Indoor unit connection switch setting
Set each indoor unit to ON or OFF with SW1.
Color:Red
Lead wire-A
(4 wires)
♦M-NET address setting
Starting with the M-NET head address set with SW11 and SW12,
Lead wire-B
the M-NET address is automatically allocated in numerical order to each indoor
(2 wires)
unit which is connected.
Ground wire
and screw
(M4 8)
Fastener
Due to continuing improvement, above specification may be subject to change without notice.
92
Attention for M-NET connection
Pay attention to the next points for wiring of shielded wires.
Power supply Outdoor Outdoor
unit unit ( 1) unit ( 1)
NO NO NO
Outdoor
Power supply Outdoor
unit ( 1)
unit unit ( 1)
OK ( 2)
Figure Q'ty
1
2
2
M 1 M 2 S
1
1
CENTRALIZED CONTROL
M1 M2 S
1
BG79H744H03
Color:White
1
Length:380 (15 in)
1
Length:530 (21 in)
1each
Length:200 (8 in)
2
M-Series - Controls (December 2016)
CAUTION
•It can cause the transmission error due to noise.
Centralized control remote controller reads "0403" "6607" error.
Good example (One spot ground of shielded wire)
System Power supply
controller unit
M-NET transmit wire
Applicable models
Outdoor
Outdoor
unit ( 1) unit ( 1)
OK
( 2)
Ground wire
M-NET
(accessory)
terminal block
M 1 M 2 S
M 1 M 2 S
Transmit Shielded
wire wire
M-NET board
M-NET address No. 1 2
SW 11
(ones digit)
Switch
setting
SW 12
(tens digit)
Connection Setting
Switch
ON Indoor connect
OFF No connection
Setting SW1 -1 -2 -3 -4
Indoor Unit A B C D
(SW1-7,8 not use)
© 2016 Mitsubishi Electric US, Inc.
SW1
SW12
SW11
50
-5 -6 (-7) (-8)
E F - -