Danfoss MCX08M User Manual

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 congure 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 dened 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.
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Danfoss MCX08M Specifications

General

Brand	Danfoss
Model	MCX08M
Category	Controller
Language	English