Danfoss EKC 326A User Manual page 7

Minimum pressure reference during heat recovery
The function can only be used if heat recovery or heat pumps are also used in the system.
The function will increase the gas pressure to the set value when it receives a signal.
The function is activated by a voltage signal at the input to terminal 20. A voltage
over 1.5 V will activate the function. (Please install a support relay if there is any risk of
error signals, e.g. with long wires.)
If the function is only required for displacement, r68 should be set to 0.
(The gas pressure can be further increased using the r68 function.)
Displacement of the control reference during heat recovery
This function increases the reference to a value above the n89 setting, but no higher
than the set value.
Displacement occurs when an input voltage of above 2 V is received for terminal 20.
The new reference is: Setting in n89 + displacement.
The value of the displacement is determined by the voltage signal and the setting for
r68.
10 V gives maximum displacement, i.e. the set value. 2 V or below will give nothing.
Displacement is linear between 2 and 10 V.
Ramp for reference modification
This can be used to set the speed at which the reference must drop again following
heat recovery (number bar/min). The function is only active after heat recovery is
complete.
Receiver control
Receiver control
Whether control of the receiver pressure should take place is defined here.
On: ETS (CCM) control. Alarm active
Off: No ETC (CCM) control. No alarm. Pressure control is active
Receiver reference
The reference for receiver control is set here.
Maximum opening degree
The ETS (CCM) valve's opening degree can be limited here. The setting is expressed as
a percentage of the total opening degree.
Minimum opening degree
The closing degree of ETS (CCM) valves can be limited here. The setting is expressed
as a percentage of the total opening degree.
Min. pressure in the receiver
The function monitors the pressure in the receiver and will start to force open the
ICMTS-valve if the pressure falls below the preset value. The value must be at least 1
bar below the reference. The function is deactivated if n72 is set to 0.
P-band to force open the ICMTS-valve if the receiver pressure is too low
P-band under "n71, Prec Min" when the valve is forced open.
If the pressure falls to n71 minus n72, the ICMTS valve will open to the value in n32,
Vhp OD Max. An alarm is then transmitted.
The pressure is not critical, so opening of the valve will take place under controlled
conditions.
P: Amplification factor Kp
If the Kp value is reduced the regulation becomes slower.
I: Integration time Tn
If the Tn value is increased the regulation becomes slower
Actuator type
If receiver control takes place, the type of valve should be set:
0: ETS 12½, ETS 25, CCM 10, CCM 20
1: ETS 50, CCM 30
2: ETS 100, CCM 40
3: ETS 250
4: ETS 400
5: Other type. "n37" and "n38" should also be set when the setting = 5
("n37" and "n38" are automatically set for settings 0 to 4)
6: CCMT 2, 4, 8
ETS (CCM) setting
Number of steps open from 0-100%
Automatically set when "n03" is set to 0, 1, 2, 3, 4 or 6
ETS (CCM) setting
Speed of spindle travel (no. of steps per second)
Automatically set when "n03" is set to 0, 1, 2, 3, 4 or 6
EKC 326A Manual RS8FM602 © Danfoss 02-2016
n89 Pgc HR Min
r68 Pgc HR offset
r65 Pgc Ref Ramp
Receiver pressure control
n90 Prec. Ctrl
n91 Prec Ref
n92 Vgbp OD Max
n93 Vgbp OD Min
n71 Prec Min
n72 Prec Min Pband
n60 Kp Receiver
n61 Tn Receiver
n03 Valve type
n37 Max. steps
n38 Steps / sec
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