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5 Example of System Configuration
Note:
• For the shield ground of the M-NET centralized control line for central control, use single-point grounding at the power unit for
the transmission line.
However, when supplying electric power to the M-NET centralized control line from the R410A series outdoor unit without using
a power supply unit for the transmission line, use single-point grounding at the TB7 of that outdoor unit.
Furthermore, when connecting this device to the M-NET indoor control line, use grounding at the TB3 for each outdoor unit
system.
• Connecting an Uninterruptible power supply (UPS) to the 24 VDC power supply is recommended in order to prevent the loss of
pulse data in the event of a power failure.
If a UPS cannot be connected, try to make the AC power supply to the 24 VDC power supply as much same as the power supply
line to the meters.
• This device does not support level meters. To use a level meter, incorporate a Converter circuit externally and convert to pulse
input.
• 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 PI controller cannot be controlled from the system controller.
TB3
M-NETM-NET
LAN
TB7
Centralized control line
Indoor control line
PI controller
G-50A or GB-50A
G(B)-50A Web
or TG-2000A
Uninterruptible
power supply
(UPS)
Watt-hour meter with
pulse transmitter, etc.
<Restrictions>
Maximum of 5 units (total of 20 channels) per G(B)-50A
However, the number of units that can be connected to a
G(B)-50A is up to 50 including this device, an indoor unit,
Lossnay unit, etc.
* For the number of units that can be connected when
controlling this device with TG-2000A, refer to the
instruction manual for TG-2000A.
* This figure omits the power supply line and only shows the transmission line.
Power supply unit
PAC-SC50KUA
PI controller
24 VDC
power supply
Up to 4 contacts
Watt-hour meter with
pulse transmitter, etc.
Uninterruptible
power supply
(UPS)
24 VDC
power supply
Up to 4 contacts
City Multi