Remak VCS Installation And Operating Instructions Manual page 20

Additional Operating Modes
Figure 17 – Operating modes
Yes
Alarm A
No
Stop,Co1,EC1,...
Manual
HMI-SG (p. 125)
HMI TM, DM
Auto
External
control
Auto
HMI-SG
contr.
Auto
BMS
Auto
Co1,EC1,Co2, ...
Time
modes
Stop
Optimized
start
Passive
Active
Temperature
start-up
Passive
Active
Night
chilling
Passive
Active
Night
turning
Passive
18
Co1,EC1,Co2, ...
State RUN
Fans
Stop
(stage 1-5)
Comfort/
Economy
Optimized
start
Temperature
start-up
Night
chilling
Night
turning
STOP
Air-Handling Unit Additional Operating Modes
If no operating mode is applied and the time schedule mode
is in the Stop state, the air-handling unit can be started from
additional operating modes. The user can use the following
additional operating modes to start the air-handling unit:
n
Night chilling
n
Temperature start-up
n
Optimized start
Additional operating modes can be activated by the HMI-SG
controller in the List of Data Points in the section Settings –
Additional Operating Modes, Functions.
Control Application Starting Algorithm
Air-handling system operation safety is assessed first (fire
detection and operational safety of the air-handling devices).
Then the operating modes and their priorities are assessed
(Manual, External, HMI-SG controller, BMS and time modes). If
no control mode is currently used, the air-handling unit can, but
may not, be put into one of the additional operating modes de-
pending on the user's option. All the operating modes and their
correlation are shown in the figure # 10 - "Operating modes".
The current operating mode can be monitored through the
HMI controller in the List of Data Points in the section Moni-
tor – Current Modes.
When the fans run and the air-handling unit is in operation,
two basic groups of parameters are used to control operation:
n Temperature mode
n Fan output (speed)
The fan output or speed can be set directly at levels corre-
sponding to the air-handling system configuration:
n Single-speed motor fans:
>> Stage 1
n Two-speed motor fans:
>> Stage 1 / Stage 2
n All five-stage controlled fans:
>> Stage 1 / Stage 2 /
Stage 3 / Stage 4 / Stage 5
See the chapter Fan Speed Control.