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Control (HMI-SG)
Operating Screen (Examples)
After making the HMI-SG controller a service controller, it is
possible to change the control unit settings. Use the Mode
(T8) button to manually switch between the Run state with
temperature modes (Comfort or Economy) and the Auto state.
Use the Power (T1) button to put the air-handling unit into
the Stop operating state, the display in the HMI-SG operating
mode will only display the ON/OFF icon (I5).
Operating State Auto
The fan speed and temperature mode are set depending on
the time schedule compilation. It is possible to set a correc-
tion to the required temperature, see the chapter Required
Temperature Correction. It is also possible to adjust the time
schedule, see the chapter Daily (Weekly) Time Schedule.
The figure shows the Auto operating state display. The state
I6
I7
I9
I3
(I14) icons can be displayed.
The figure shows the situation where a time schedule con-
I3
section Monitor – Current Modes – Current Modes – Current
operating Mode.
Manual Operating Mode (Run)
In Manual operating mode, it is possible to select the required
temperature mode, set any fan speed output stage and the
required temperature correction.
This display shows the manually selected Comfort tem-
I8
I9
26
is signalled by an icon (I6). The
air-handling unit is controlled
in accordance with the time
schedule. The moderate heating
temperature mode (I7) with a
cooling sequence (I9) is active.
The fans are set to the second
speed stage (I3). Apart from the
cooling sequence, the heating
(I10), heat recovery and mixing
trolled air-handling unit is in the
Stop operating state. The fans are
not running (I3). No temperature
modes or heating or cooling
sequences are active.
Warning: Current additional
operating mode stats are not
displayed but can be monitored
in the List of Data Points in the
perature mode (I8) with a heating
sequence (I10) and the fourth fan
speed stage. In Manual mode, the
fan speed can be set using the Fan
button (T7). To manually switch
between the temperature modes,
use the Mode (T8) button.
Failure Detection
If a failure of external components
connected to the device failure detection inputs (incorrect
state of the contact) occurs, the VCS control unit will au-
tomatically put out an alarm in accordance with an internal
algorithm – indicating the faulty object and in case of severe
failures stopping the air-handling unit. Each failure is more
closely specified by a failure class. The failure class determines
the severity of the failure. A class failures will shut down the
air-handling unit. B class failures will deactivate some system
functions (e.g. compensation if the temperature sensor fails)
but they will not shut down the air-handling unit. Numerical
failure codes specifying the failure events are listed in the
chapter Failures. If more failure events occur, the number of
the failure with the highest priority (the most serious failure)
will be displayed.
Failure Screen (example)
If a failure occurs, the air-handling unit is put in the STOP state
(respectively the Run mode is retained, B class failure). This is
I6
I15
I19
I18
Failure reset can only be performed once the cause of the
failure has been identified and removed. The failures are reset
using data point 825.
Required Temperature Settings in Temperature Modes
Required temperature settings for the Comfort and Economy
temperature modes are performed in the List of Data Points
–Temperature Modes:
n
101 – Comfort cooling
n
103 – Comfort heating
n
105 – Economy cooling
n
107 – Economy heating
Required Temperature Correction
The pre-set required temperatures in each temperature
mode can be changed within ±3 °C directly from the HMI-SG
controller. Use the Plus (T5) button to increase the required
temperature or use the Minus (T4) button to decrease the
required temperature. The one button pressing increment or
decrement value can be set in data point 897. This tempera-
ture adjustment is only valid for a current mode. Upon transi-
tion between modes, this correction will be reset.
indicated by flashing Auto (I6) and
Alarm (I15) icons on the display.
The failure class (I18) and number
(I19) are displayed below the
temperature indication. Indication
of the alarm will cease shortly
after all failure events have been
removed. The number shown on
the display can also be accessed
via data point 824.
Failure Reset
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