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Verfügbare Sprachen
KVQ feedback terminals 35 and 36
To be connected to terminals 6 and 8.
Connection of outputs
See fig. 8
External alarm
See "Function extensions".
Defrost output
Supply voltage from the EKS 67. Max. load
1.0 A, 24 V a.c. To be connected to terminals
24 and 25.
KVQ power terminals 77 - 78
To be connected to terminals 26 and 27. The
cable dimension, between actuator power
terminals and regulator, is determined by the
length of the cable and its resistance. See
manual.
Voltage to the actuator must only be supplied
from the EKS 67 controller.
Before connecting the regulator, check all
lead connections. See fig. 18.
Warning! Incorrect connection can damage
the regulator.
Setting
Defrost
See fig. 14 and 15
The changeover between electric and hot-gas
defrosting can be performed using the switch
on the rear of the EKS 67 (fig. 10).
Electric defrost = Position 1
Hot-gas defrost = Position 2
With hot-gas defrosting, the EKS 67 ensures
forced closing of the KVQ before defrost is
begun. With electric defrosting, no previous
closing of the KVQ valve occurs before
defrosting begins.
Defrosting is stopped by the built-in
thermostat function via S2 signal. At the same
time the ALARM DELAY is set on zero.
Temperature setting
See figs. 9 and 11
Set the required reference temperature on
switch REF (item 14) and potentiometer REF
(item 15).
The figure shows a temperature setting of
-9°C. Setting switch REF on -10°C and poten-
tiometer REF on +1°C gives a temperature:
-10°C + (+1°C) = -9°C
Note: Switch REF must not be set halfway
between two steps of 10°C.
Function extensions
External alarm
There are facilities for connecting an external
alarm relay.
The connection must be made using
terminals 22-23, fig. 8.
Max. load 0.5 A, 24 V a.c.
On alarm the voltage drops to 10 V a.c.
Remote setting
It is possible to establish remote setting of
reference temperature. See manual.
Temperature readout - external display
A display for reading temperatures T
and T
can be connected. See manual.
REF
The display cannot be supplied with power
from the EKS 67.
Limitation of evaporating pressure
can be obtained by connecting a
potentiometer to the EKS 67. It will then be
possible to make a variable downward
limitation of evaporating pressure P
bar. See manual.
Light indication
There are three LED lamps on the front panel
of the unit.
Green ON/ALARM lamp
ON = constant light indicates: System
running. Alarm not released
Lamp out indicates: Alarm signal on alarm
output
Red LlMlT lamp
Light indicates: Sensor temperature T
outside the set alarm limit
Red DEFROST lamp
Light indicates: Defrost in operation
Function check
See fig. 12
1. T
. Measuring point to check temperature
S1
of medium at sensor S1
2. T
. Measuring point to check defrost
S2
temperature at sensor S2
3. T
. Measuring point to check reference
REF
setting
4. V
. REF for measuring points T
REF
T
.
REF
T
, T
and T
S1
S2
relation to V
REF
Measuring point to check reference voltage
The stabilized supply voltage can be
checked by measuring V
(5 V ±0.1 V d.c.)
5. V
. Measuring point to check the charge
NTC
temperature in the KVQ (1 V d.c. < V
5 V d.c.)
6. DEFROST START for forced defrosting of
plant. DEFROST is started by short-circuit-
ing the input to 0 for at least 2 seconds.
Running-in
During running-in of the KVQ + EKS 67 the
plant must be made to operate stably. Only
the KVQ + EKS 67 must be able to alter the
balance of the plant. Fans, etc. must therefore
not be cut in and cut out.
1. Adjust the thermostatic expansion valve to
minimum stable superheat
2. Connect the EKS 67 and set the required
reference temperature (temperature of
medium) on the REF switch and REF
potentiometer
3. Measure media sensor temperature T
The measurement must be taken between
test point T
S1
If necessary, the media sensor
temperature can be registered by a line
recorder connected to terminals 11-13.
If the system hunts, by registering the period
time of the hunting it is possible to determine
whether it is the proportional amplification, K
that is too high or the integration time, T
is too short.
Hunting can then be reduced by making
corrections of T
registered period time T
Period time > integration time
(T
> T
= 4 min)
p
n
A. Increase.T
to 1.2 x T
n
B. Wait until the system is again in balance
, T
C. If the system still hunts, reduce K
S1
S2
example, 20% of the scale value
D. Wait until the system is in balance
E. If the system still hunts, repeat C and D.
Period time < integration time
(T
< T
= 4 minutes)
p
n
A. Reduce K
by, for example, 20% of the
p
scale value
= 0 ® 7
B. Wait until the plant is in balance
0
C. If the plant still hunts, repeat A and B
S1
, T
and
S1
S2
= 0.1 V/°C measured in
REF
.
in relation to 0
REF
<
NTC
.
S1
and V
(0.1 V/ °C).
REF
p
that
n
and K
in relation to the
n
p
.
p
p
by, for
p
162
Deutsch
Das Regelsystem
Siehe Fig. 1
EKS 67 ist ein elektronischer Regler für die
Regelung der Kühlstellentemperatur einer
Kälteanlage und muss zusammen mit dem
Ventil/Stellantrieb KVQ sowie einem oder
mehreren Temperaturfühlern Pt 1000
eingesetzt werden.
Positionsliste EKS 67
Siehe Fig. 11
1. T
. Messpunkt für die Kontrolle der
S1
Kühlstellentemperatur am Fühler S1
2. T
. Messpunkt für die Kontrolle der
S2
Temperatur für die Abtaubeendigung am
Fühler S2
3. T
. Messpunkt für die Kontrolle des
REF
eingestellten Sollwertes
4. V
. Bezugspunkt (Referenz) für T
REF
und T
REF
Messpunkt für die Kontrolle der Referenz-
spannung
5. V
. Messpunkt für die Spannung über
NTC
NTC im KVQ
6. DEFROST START. Zwangsabtauung der
Anlage.
7. 0 wird als Kurzschlusspunkt für DEFROST
START sowie als Bezugspunkt (Referenz)
für V
und V
verwendet
NTC
REF
8. Grüne Signallampe
Leuchtet
= EKS 67 ON
Leuchtet nicht = ALARM oder OFF
9. Wird nicht verwendet
10. Rote DEFROST Signallampe
11. Wird nicht verwendet
12. Rote LIMIT Signallampe
13. Verschlusschraube des Einsatzes
14. Sollwertschalter REF. Einstellung der
Sollwerttemperatur in Sprüngen von 10°C
15. Potentiometer REF. Feineinstellung der
Sollwerttemperatur ±5°C
16. Potentiometer LIM. Einstellung der
Alarmgrenze für die Kühlstellentempera-
tur
17. Potentiometer DEL. Einstellung des Alarm
Delays (Verzögerung)
18. Potentiometer DEF. Einstellung der
Ausschalttemperatur für die Abtauung
19. Potentiometer K
. Einstellung der
P
Proportionalverstärkung
20. BUS. Wird nicht verwendet
21. Umschalter für Heissgasabtauung und
elektrische Abtauung
22. Potentiometer T
. Einstellung der
n
Nachstellzeit.
,
Technische Daten
Regelbereich
-35°C ® +25°C REF (Sollwert)
Regelgenauigkeit des Geräts £ ±0,5 K der
eingestellten Sollwerttemperatur.
Funktionen
1. LlMlT(Alarmgrenze):
1 ® 5 K ±0,5 K in bezug auf die (Sollwert)-
Einstellung (REF)
2. DELAY (Alarmverzögerung):
15 ®120 min Verzögerung der Alarmaus-
lösung bei Überschreitung des LlMlTs
3. DEFROST (Abtaustopp):
0 ® 25°C. Thermostat für die Beendigung
der Abtauung (Fühler S2 muss
angeschlossen sein).
Regelprinzip
Pl proportionale integrale Regelung
, T
S1
S2
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