MH-RC-MBS-1
User’s Manual r6.
3 EN
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This information is subject to change without notice
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12/23
Where:
S
AC
- setpoint value currently applied to the indoor unit
S
u
- setpoint value (register 4/5)
T
u
- external temperature reference written at Modbus side (register 22/23)
T
AC
- ambient temperature that the indoor unit is using as the reference of its
own control loop (register 5/6)
When MH-RC-MBS-1 detects a change in any of the values of
{
S
u
,
T
u
,
T
AC
}, it will send the new setpoint (
S
AC
) to the indoor unit.
o
After the startup, the
value for “external temperature’s
reference” (register
22/23) has a value -32768 (0x8000). This value means that no external
temperature reference is being provided through MH-RC-MBS-1. In this scenario,
the AC indoor unit is going to use its own Return Path temperature from the
sensor (register 66/67) as a reference of its own control loop. This process
happens if the MH-RC-MBS-1 has role as Master or as Slave.
o
When
the mechanism of “
Virtual Temperature
” is applie
d,
the temperature
setpoint’s value shown by the Remote Controller o
r other Control System from
Mitsubishi Heavy Industries connected to the indoor unit may show a different
value from the value shown in register 4/5.
o
If it is desired to use the temperature’s reading from the Remote Control as the
external temperature reference (
T
u
,register 22/33), the Remote Controller must
be configured as Master, and the Mitsubishi Heavy Industries AC indoor unit must
have
the option “
thermostat sensor in the Remote Controller
”
as activated. This
configuration is done via a Mitsubishi Heavy Industries Remote Controller
connected to the indoor unit and must be done by Mitsubishi Heavy Industries
authorized installers while the AC is being installed.
o
When MH-RC-MBS-
1 is set as “Master” of
XY bus
, the external temperature’s
sensor connected to Modbus RTU EIA-485 network provides directly the value
currently applied to the indoor unit (
S
AC
), and the process of the Virtual
temperature is not applied. In this case, the Remote Controller or any other
Control System connected from Mitsubishi Heavy Industries is not able to send
the
external temperature reference’s value to the register 22/23.
•
AC Real temperature setpoint (R)
(register 23
–
In Protocol address / register 24
–
in PLC address)
:
As it has been detailed on the previous point, the real temperature setpoint in the indoor
unit and the temperature setpoint requested from MH-RC-MBS-1 might differ (when a
value in register 22/23
–
“external temperature reference” is
entered). This register
always informs about the current temperature setpoint which is being used by the indoor
unit
–
it is also includes the temperature setpoint that will be shown by an additional
remote controller from Mitsubishi Heavy Industries connected to the indoor unit, if it is
present on the system.
