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Control (HMI-SG)
4) The cursor with the communication parameter value will
start to flash. The parameter value can be changed by pressing
the Plus or Minus (T4) buttons. Press the Power (T1) button
to confirm the change to the communication parameter value.
5) To return to a higher level, press the Power (T1) button. If
no change is made within 1 minute, the interface will be exited.
Note: If the air-handling unit is controlled by two HMI-SG
controllers, the last change made from one of the control-
lers will be valid.
System Date and Time Settings
Here, the actual VCS system date and time can be set –
these setting are required for correct functioning of the time
schedule programs. The procedure for system date and time
setting is as follows:
After long hold the Program (T3) button to set the date and
time. Press the Plus (T5) and Minus (T4) buttons to change
the date and time values. Press the OK (T6) button to confirm
the changes and the cursor will move to the next item. The
cursor cycles through the following items:
Hour → Minute → Month → Day → Year
Default Application Parameterization
To ensure comfortable and economy operation requiring mini-
mum attendance, it is necessary to perform the main settings
defining the parameters and air output, respectively the tem-
perature control, and stability in the ventilated/air-conditioned
room. Data points must be set for all the relevant parameters:
n
Temperature modes
n
Time schedules
n
Control parameters
n
Correction values
n
Antifreeze Protection
n
Control constants
n
Optional modes and functions
The parameters are described in the chapter List of Data
Points, Factory Settings.
Control units VCS
Operating the HMI-SG controller
If only one HMI-SG controller is connected to the control unit,
it then serves as an operating controller for full setting and
control of the control unit. During the first start-up of the air-
handling unit, the manual operating mode (the highest priority)
is set to the Stop state, and the HMI-SG controller does not
interfere with control of the control unit. In the Manual operat-
ing mode, it is necessary to change the state from Stop to
Auto using data point #125 and thus move the priority from
the control unit to the HMI-SG controller's operating mode.
First Control Unit Start-Up Using HMI-SG Controller
1) Press the Plus (T5), Minus (T4) and Mode (T8) buttons
simultaneously to display the log-in screen for the 4-digit
password. Change the value of the digit by pressing the Plus
(T5) or Minus (T4) button. Press the Mode (T8) button to
confirm the entered digit and the cursor will move to the
next position. Once the correct password has been entered,
the data point screen will be displayed. Press the Power (T1)
button to leave the log-in interface.
2) The first digit "0--" will be displayed. To change the first digit
value, press the Plus (T5) or Minus (T4) button. To confirm the
entered value, press the Mode (T8) button.
Use the Plus (T5) and Minus (T4) buttons to set the last two
digits to get the string "125". To confirm the entered value,
press the Mode (T8) button. To return to the previous step,
press the Power (T1) button.
3) The flashing number on the second line represents a data
Figure 23 – HMI-SG controller LCD display
I6
I2
I4
point value. Use the Minus (T4) buttons to change the data
point value from "1" to "0" and confirm by pressing the Mode
(T8) button. To return to the previous step, press the Power
(T1) button.
The situation before initiating the control unit from the HMI-SG
controller is illustrated in figure 16. The Stop operating mode
is indicated by the Auto icon (I6). Current temperature (I1) and
system time (I2) are displayed. The fans are not running (I3).
The day of the week is indicated by digits (1–7) in the lower
part of the display.
Note: 12h/24h system time format cam be changed using
data point 898. The source of the displayed temperature can
be selected using data point 887.
I1
I3
25
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