Mitsubishi Electric PURY-WP-YJM-A, Data Book, Page: 145 / 220

3. System remote controller
CONTROLLER 3 - 60
Contr
oller
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
*1
without using a power supply unit for the transmission line, use single-point grounding at the TB7 of that
outdoor unit. *1 : Except PUMY model.
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 AC 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 the M-NET transmission line of 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.