M-Net Transmission Line; Lan Connection - Mitsubishi Electric GB-50A Installation Manual

3. M-NET transmission line

Connect the M-NET transmission line to the A, B (non-polarity) and S (shield) terminal block, as shown in
Fig. 6-3.
PAC-
SC50
KUA
TB2
CAUTION
DC power to the M-NET transmission line is supplied from either the power supply unit PAC-SC50KUA
or R410A outdoor unit. When supplying the power from R410A outdoor unit to the transmission line for
central control (TB7), disconnect the male connector from the female power supply switch connector
(CN41: no power supply) and connect it to the female power supply switch connector (CN40: power
supply) on only one of the outdoor units. For further details, refer to the transmission manual of the
outdoor unit. Not doing so may cause unit failure or fire.
Securely connect the wiring using the specified cables and fix them so that the stress from the cables
is not applied to the terminal connection sections. If connection or fixing is not reliably connected,
it may cause heat generation, a fire, etc.

4. LAN connection

Connect the LAN cable to the LAN connector of this device.
● Procure the LAN cable at the site, and use an enhanced category 5UTP cable.
● For a description of the IP address setting method, refer to section
● LAN is 10 BASE-T Specification.
● The maximum wiring length from HUB to GB-50A is 100m.
● GB-50A is connected to the monitoring PC via HUB.
NOTE
● Perform the LAN wiring before installation, and wire up to the unit by the same method as wiring of
M-NET transmission line.
● When a LAN is already connected, decide the IP address by consultation with the system
administrator and connect the LAN port after changing the IP address.
● Space for the connector and wiring is required. Refer to section
GB-50A
M-NET
M-NET terminal block
Shield
Vinyl tape etc. (*1)
M-NET transmission A, B line
(Non-polarity DC24V)
Fig.6-3
LAN
12
Outdoor
unit
TB7
M-NET
A B S
Shield
Vinyl tape etc. (*1)
M-NET transmission A, B line
(Non-polarity DC24V)
(*1) Insulate the shielded wire with
vinyl tape except for the end where it
is connected to the terminal screw.
. .
7 Initial setting
.
5 Installation method