EKC
326A
Manual RS8FM602 © Danfoss 02-2016
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.)
n89
Pgc HR Min
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.
r68
Pgc HR offset
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.
r65
Pgc Ref Ramp
Receiver control
Receiver pressure 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
n90
Prec. Ctrl
Receiver reference
The reference for receiver control is set here.
n91
Prec Ref
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.
n92
Vgbp OD Max
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.
n93
Vgbp OD Min
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.
n71
Prec Min
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.
n72
Prec Min Pband
P: Amplification factor Kp
If the Kp value is reduced the regulation becomes slower.
n60
Kp Receiver
I: Integration time Tn
If the Tn value is increased the regulation becomes slower
n61
Tn Receiver
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
n03
Valve type
ETS (CCM) setting
Number of steps open from 0-100%
Automatically set when "n03" is set to 0, 1, 2, 3, 4 or 6
n37
Max. steps
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
n38
Steps / sec