IntesisBox ME-AC-MBS-1 User Manual page 11

In general, ME-AC-MBS-1 is constantly applying the "Virtual Temperature"
o
formula:
Where:
- setpoint value currently applied to the indoor unit
S
AC
- setpoint value written at Modbus side (register 4/5)
S
u
- external temperature reference written at Modbus side (register 22/23)
T
u
- ambient temperature that the indoor unit is using as the reference of its
T
AC
own control loop (register 5/6)
When ME-AC-MBS-1 detects a change in any of the values of
{ S
, T
u
After the startup, the value for "external temperature's reference" (register
o
22/23) has a value -32768 (0x8000). This value means that no external
temperature reference is being provided through ME-AC-MBS-1. In this scenario,
the setpoint value shown or written in register 4/5 will always be the same as the
current setpoint value of the indoor unit.
Notice that, the use of the "external temperature reference" (register 22/23)
o
(e.g., writing a value different from -32768 / 0x8000 in it) has the following
relevant consequences:
•
•
• AC Real setpoint temperature (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 ME-AC-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 connected to the indoor unit, if it is present on the
system.
Moreover, notice that temperature's values of all these four registers are expressed according to
the temperature's format configured through its onboard DIP-Switches (See 4.3). The following
formats are possible:
• Celsius value: Value in Modbus register is the temperature value in Celsius (i.e. a
value "22" in the Modbus register must be interpreted as 22ºC).
• Decicelsius value: Value in Modbus register is the temperature value in
decicelsius (i.e. a value "220" in the Modbus register must be interpreted as
22.0ºC).
• Fahrenheit value: Value in Modbus register is the temperature value in
Fahrenheit (i.e. a value "72" in the Modbus register must be interpreted as 72ºF
(~22ºC).
© Intesis Software S.L.U. - All rights reserved
This information is subject to change without notice
IntesisBox ® is a registered trademark of Intesis Software SLU
ME-AC-MBS-1
S
AC
}, it will send the new setpoint (S
, T
u AC
The mechanism of "Virtual Temperature" is applied. The temperature
setpoint's value shown by the Remote Controller or other Control System
from Mitsubishi connected to the indoor unit may show a different value
from the value shown in register 4/5.
The User is not be able to change the setpoint using any Remote Controller
from Mitsubishi, as setpoint of the indoor unit becomes exclusively
controlled by the "Virtual Temperature" mechanism.
– ( T – T
= S )
u u AC
) to the indoor unit.
AC
URL
Email
Phone
User's Manual r21 EN
http://www.intesisbox.com
info@intesisbox.com
+34 938047134
11/18