Control Parameters; Alarm Relay; Definition Of Regulating Principle; Period Time - Danfoss EKC 347 Manual

Configuration of limit alarm (A3) level and lower limit alarm(A2) for pump cut-
out.
To define whether the limit alarm (A3) is linked to rising (A18=0) or falling level
(A18=1).
It is also possible to configurate the Relay for lower level limit when lower limit alarm
(A2) is detected. Dedicated to switch off pumps at low level alarm.
0: Rising level. When liquid level is higher than A16, and time in A17 has expired, A3
alarm is generated.
1: Falling level . When liquid level is lower than A16, and time in A17 has expired, A3
alarm is generated.
2: Same function as if A18=0, but in addition (to that:
- When liquid level is higher than A02. No A2 alarm and Relay for lower level limit,
gives ON signal (cut in) on terminal 8 and 10.
- When liquid level is lower than A02 and time in A15 has expired. A2 alarm is gener-
ated and Relay for lower level limit, gives OFF signal (cut out) on terminal 8 and 10.
3: Same function as if A18=1, but in addition (to that:
- When liquid level is higher than A02. No A2 alarm and Relay for lower level limit,
gives ON signal (cut in) on terminal 8 and 10.
- When liquid level is lower than A02 and time in A15 has expired. A2 alarm is gener-
ated and Relay for lower level limit, gives OFF signal (cut out) on terminal 8 and 10.
Function Alarm relay when A1, A2 or A3 alarms are detected.
0: Alarm relay to be activated when A1 or A2 or A3 are detected.
1: Alarm relay only to be activated when A3 is detected.

Alarm relay

The alarm relay will become activated if one of the set limits is exceeded or if the
controller loses the input signal from the level-measuring unit.

Control parameters

Definition of regulating principle

Here you set whether the controller is to open or close the valve when the liquid level
is rising.
Low (0): Regulation on the low-pressure side. The valve closes when liquid level is
rising.
High (1): Regulation on the high-pressure side. The valve opens when liquid level is
rising.

Period time

An AKV/A valve is operated with pulses of a given length. The length depends on the
opening degree required. If a large opening degree is required, the pulse will last for
an entire period time. A period time will thus comprise both open and closed valve.
P - band
If the value is reduced the regulating range will be reduced. (The P-band will be near
the reference).
I: Integration time Tn
The I-link can be made passive by setting the value at max. (600s)
(If the Tn value is increased the regulation becomes slower).
Neutralzone
The function is only active if the selected expansion valve is of type ICM
Min. opening degree
Here you can make a setting if you require a limitation of the valve's working range.
Max. opening degree
Here you can make a setting if you require a limitation of the valve's working range.
EKC 347 Manual RS8AX702 DKRCC.ES.R1.A1.02/ 520H4020 © Danfoss 01-2011
A18 A18 Lim. LowMode
A19 A19 Alarm type
(With setting = 0 the alarm is also
transmitted via the data communica-
tion)
With data communication the impor-
tance of the individual alarms can be
defined. Setting is carried out in the
"Alarm destinations" menu. See also
page 11.
Injection Settings
n35 n35 Low/High Pr.
n13 n13 AKV per.time
n04 n04 P-band
n05 n05 Tn sec.
n34 n34 Neutralzone
n33 n33 OD Min.
n32 n32 OD Max.
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