DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
20
Danfoss Electronics spa
Air Handling seq.
- user manual
4.3.2|
3-point valve control
This is a valve with 3 electrical contacts plus the power supply: common, open and close.
The following parameters are used to configure a 3 point valve.
3-POINT VALVE CONTROL
COI
Coils
Min
Max
Default
U.M.
Text value
CL1
Coil 1
b13
Valve full excursion time
0
9999
20
SEC
b14
Valve minimum variation
0
50
2
%
b15
Valve forcing period
0
9999
60
MIN
b16
Valve range
0
50
0
%
CL2
Coil 2
b43
Valve full excursion time
0
9999
20
SEC
b44
Valve minimum variation
0
50
2
%
b45
Valve forcing period
0
9999
60
MIN
b46
Valve range
0
50
0
%
CL3
Coil 3
b73
Valve full excursion time
0
9999
20
SEC
b74
Valve minimum variation
0
50
2
%
b75
Valve forcing period
0
9999
60
MIN
b76
Valve range
0
50
0
%
Tab 12_ [Coils control - 3-Point valve control]
b13, b43, b73 – Valve full excursion time
Indicates the time the valve takes to go from fully closed to fully open. The valve control algorithm uses this time to
calculate the activation time for the outputs “Valve1-2-3 Open” and “Valve1-2-3 Close”.
Depending on the length of time the contact is activated, the extent to which the valve is opened varies from 0%
to 100% of the excursion time. The relays are never activated simultaneously, thus the valves either open, or close,
or remain still
To obviate the lack of feedback that provides exact information on the valve opening step, the following rules
apply:
When the instrument is turned on, the valve is closed or open all the way for an amount of time equal
to the excursion time + 25%, and the position of the valve is realigned before regulation is started.
Whenever the temperature regulation requires opening or closing a valve
all the way, the program increases the opening or closing relay activation
time by 25% to ensure that the valve opens or closes all the way.
b14, b44, b74 – Valve minimum variation
This is the minimum shift performed with the valve.
b15, b45, b75 - Valve forcing period
If the valve is fully open or fully closed, the opening or closing command is periodically sent for a time equal to 25%
of the full excursion time. The frequency of this command is defined in this parameter.
b16, b46, b76 – Valve range
If the valve is commanded to a position lower than this parameter (as a percentage of the fully open or fully closed
position), the valve will open or close all the way.
Example
*b15=5% means that a request
for a 4% position will cause the
valve to fully close and a request
for 96% will cause it to open all
the way.
»
»
