4
User
Guide RS8FZ402 © Danfoss 2015-07
EKC
313
Function overview
Function
Para-
meter
Parameter by operation via
data communication
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).
u24 /
u21
Valve OD %
SH
Control parameters
Injection control
Start/stop of regulation
This setting can be used to start and stop regulation.
r12
Main Switch
I: Integration time Tn
If the Tn value is increased the regulation becomes slower
n05
Tn sec.
Lower limit value for the condensing pressure.
If the pressure falls, the valve will start closing.
n98
Tc Ref
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.
n32
OD% Max
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.
n20
Kp T0
Kp value for amplification factor for PID regulation
n95
Kp Max
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.
n19
Kp Min
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.
n17
Start OD%
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.
n15
StartUp time
MOP
If no MOP function is required, select pos. Off. (A value of max. (60) will correspond to
Off)
n11
MOP (bar)
Min. value for the superheat reference
n10
SH Min
Max. value for the superheat reference
n09
SH Max
D: Differentiation time Td
n06
Td sec
