5.6 Control parameters 1
The applications A333.1 and A333.2 control the motorized control
valve M1 by means of 3-point control.
The application A333.3 controls the M1 by means of a 0 - 10 volt
control signal.
The motorized control valve M1 is opened gradually when the flow
temperature S3 is lower than the desired flow temperature and
vice versa.
3-point controlled M1 (A333.1 and A333.2):
"Open" and "close" commands come from the electronic outputs of
the ECL Comfort controller and control the position of M1.
The commands are expressed as "Arrow-up" (open) and
"Arrow-down" (close) and displayed at the M1 symbol.
When the temperature at S3 is lower than the desired temperature,
short open-commands come from the ECL Comfort controller in
order to open M1 more than the moment before. By this, the S3
temperature aligns with the desired temperature.
Oppositely, when the temperature at S3 is higher than the desired
temperature, short close-commands come from the ECL Comfort
controller in order to close M1 more than the moment before.
Again, the S3 temperature aligns with the desired temperature.
Neither open-commands nor close-commands will come as long as
the flow temperature corresponds to the desired temperature.
0 - 10 volt controlled M1 (A333.3):
A control voltage between 0 and 10 volt comes from the extension
module ECA 32 and controls the position of M1. The voltage is
expressed as a % value and displayed at the M1 symbol.
When the temperature at S3 is lower than the desired temperature,
the control voltage is gradually increased in order to open M1 more
than the moment before. By this, the S3 temperature aligns with
the desired temperature.
The control voltage remains on a fixed value as long as the flow
temperature corresponds to the desired temperature.
Oppositely, when the temperature at S3 is higher than the desired
temperature, the control voltage is gradually decreased in order to
close M1 more than the moment before. Again, the S3 temperature
aligns with the desired temperature.
VI.GU.T2.02
© Danfoss | 2017.09 | 87
Operating Guide ECL Comfort 310, application A333