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Function overview
Function
Normal display
Displays either the valve's actual opening degree or the actual superheat value.
(Desired value can be set in o17)
Briefly pushing the bottom button will display one of the two readings.
Briefly pushing both buttons will display the superheat reference (u22).
Control parameters
Start/stop of regulation
This setting can be used to start and stop regulation.
I: Integration time Tn
If the Tn value is increased the regulation becomes slower
Lower limit value for the condensing pressure.
If the pressure falls, the valve will start closing.
Max. opening degree
The valve's opening degree can be limited here.
The setting is expressed as a % of the total opening degree. The voltage signal of 0-10
V on the output will be limited correspondingly.
Amplification factor for the superheat
This setting determines the valve's opening degree as a function of the change in
evaporating pressure. An increase of the evaporating pressure will result in a reduced
opening degree. When there is a drop-out on the low-pressure thermostat during
start-up the value must be raised a bit. If there is pendling during start-up the value
must be reduced a little.
The value should only be changed by specially trained staff.
Kp value for amplification factor for PID regulation
Kp value near reference value
Just around the reference this value will be used in stead of the "n95 value"
The value should only be changed by specially trained staff.
Signal safety during start-up
The control function uses the value as start value for the valve's opening degree at
each thermostat cutin. By adaptive control the controller continuously calculates a
new value.
The value should only be changed by specially trained staff.
Start-up time for safety signal
If the controller does not obtain a reliable signal within this period of time the con-
troller will in other ways try to establish a stable signal. (A too high value may result in
a flooded evaporator).
The value should only be changed by specially trained staff.
MOP
If no MOP function is required, select pos. Off. (A value of max. (60) will correspond to
Off )
Min. value for the superheat reference
Max. value for the superheat reference
D: Differentiation time Td
4
User Guide RS8FZ402 © Danfoss 2015-07
Para-
Parameter by operation via
meter
data communication
u24 /
Valve OD %
u21
SH
Injection control
r12
Main Switch
n05
Tn sec.
n98
Tc Ref
n32
OD% Max
n20
Kp T0
n95
Kp Max
n19
Kp Min
n17
Start OD%
n15
StartUp time
n11
MOP (bar)
n10
SH Min
n09
SH Max
n06
Td sec
EKC 313
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