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Lysindikering
På apparatets front findes 3 LED lamper
Grøn ON/ALARM lampe
ON = konstant lys indikerer: Systemet kører.
Alarmen er ikke udløst
Slukket lampe indikerer: Alarmsignal på
alarmudgangen
Rød LIMIT lampe
Lys indikerer: Følertemperaturen T
for den indstillede alarmgrænse
Rød DEFROST lampe
Lys indikerer: Igangværende afrimning
Funktionskontrol
Se fig. 12
1. T
. Målepunkt til kontrol af medie-
S1
temperatur ved føler S1
2. T
. Målepunkt til kontrol af afrimnings-
S2
temperatur ved føler S2
3. T
. Målepunkt til kontrol af reference-
REF
indstilling
4. V
. REF for målepunkterne T
REF
T
, T
og T
= 0,1 V/°C målt i forhold til
S1
S2
REF
V
. Målepunkt til kontrol af reference-
REF
spænding
Den stabiliserede forsyningsspænding
kontrolleres ved at måle V
REF
(5 V ± 0,1 V d.c.)
5. V
. Målepunkt til kontrol af fyldnings-
NTC
temperatur i KVQ (1 Vd.c.< V
6. DEFROST START til tvangsafrimning af
anlægget. DEFROST startes ved at
kortslutte indgangen til 0 i mindst 2 s.
Indkøring
Under indkøring af KVQ + EKS 67 skal
anlægget bringes til at arbejde stabilt. Kun
KVQ + EKS 67 må kunne ændre anlæggets
balance. Ventilatorer og lignende må derfor
ikke ind- eller udkobles.
1. Juster den termostatiske ekspansionsventil
til minimal stabil overhedning
2. Tilslut EKS 67 og indstil den ønskede
referencetemperatur (medietemperatur) på
omskifter REF og potentiometer REF
3. Mediefølertemperaturen T
S1
Målingen foretages mellem testpunktet T
og V
(0,1 V/°C)
REF
Evt. kan mediefølertemperaturen
registreres ved hjælp af en linieskriver, der
tilsluttes klemme 11-13
Hvis systemet pendler, kan man ved at
registrere pendlingernes periodetid finde frem
til, om det er proportionalforstærkningen K
der er for høj eller integrationstiden T
for kort. Pendlingerne kan nu reduceres ved
at foretage korrektioner af T
og K
n
den registrerede periodetid T
p
Periodetid > integrationstid (T
A. T
øges til 1,2 x T
n
p
B. Vent til anlægget igen er i balance
C. Hvis der stadig er pendling, reduceres K
med f.eks. 20% af skalaværdien
D. Vent til anlægget er i balance
E. Ved stadig pendling gentages C og D
Periodetid < integrationstid (T
A. K
reduceres med f.eks. 20% af
p
skalaværdien
B. Vent til anlægget er i balance
C. Ved stadig pendling gentages A og B.
English
Regulation system
See fig. 1
The EKS 67 is an electronic controller
designed to control the temperature of media
in a refrigeration plant.
The EKS 67 must be used with valve/actuator
KVQ and one or two Pt 1000 temperature
sensors.
er uden
S1
Item list, EKS 67
See fig. 11
1. T
. Measuring point for checking the
S1
temperature of the medium at sensor S1
2. T
. Measuring point for checking the
S2
temperature of defrost stop at sensor S2
3. T
. Measuring point for checking the set
REF
reference temperature
4. V
. Reference point for measuring points
REF
T
, T
S1
S2
Measuring point for checking reference
voltage
5. V
. Measuring of voltage across NTC in
NTC
, T
og T
KVQ
S1
S2
REF
6. DEFROST START. Forced defrosting of the
plant
7. 0 is used as a short-circuiting point for
DEFROST START and as a reference for
i forhold til 0
V
and V
NTC
8. Green ALARM signal lamp
Light
< 5 V d.c.)
No light = ALARM/OFF
NTC
9. Not used
10. Red DEFROST signal lamp
11. Not used
12. Red LlMlT signal lamp
13. Locking screw for insert
14. Switch REF. Setting of reference
temperature in steps of 10°C
15. Potentiometer REF. Fine setting of
reference temperature ±5°C
16. Potentiometer LIM. Setting of alarm limit
for temperature of medium
17. Potentiometer DEL. Setting of alarm
delay
18. Potentiometer DEF. Setting of defrost
stop temperature
måles
19. Potentiometer K
amplification
S1
20. BUS. Not used
21. Switch for hot-gas or electric defrost
22. Potentiometer T
time
Technical data
,
Regulation range
p
, der er
-35°C ® +25°C REF. The unit regulates with
n
an accuracy of £ ±0.5°C in relation to the set
i relation til
REF temperature.
p
.
Functions
> T
= 4 min)
1. ALARM LIMIT:
p
n
1 ® 5°C ±0.5°C on both sides of REF
2. ALARM DELAY:
15 ®120 minutes. Delay of alarm release
p
in relation to the time at which LIMIT is
exceeded
3. DEFROST STOP:
0 ® 25°C. Thermostat for setting required
< T
= 4 min)
temperature for defrost stop. (Sensor S2
p
n
must be installed).
Regulation principle
PI proportional, integral regulation
Regulation parameters
Amplification factor K
Factory setting K
Integration time T
Factory setting T
, and T
.
REF
REF
= EKS 67 ON
. Setting of proportional
p
. Setting of integration
n
= 2 ® 6
p
= 4
p
= 2 ® 6 min
n
= 4 min
n
161
Ambient temperature
-20°C ® +40°C (plastic case)
-20°C ® +45°C (silumin case)
-20°C ® +50°C (for building in)
Supply voltage
Stabilized 24 V a.c. +10%/-15%, 50/60 Hz
Max. consumption: 2 VA/24 V a.c. for EKS 67
Max. consumption: 32 VA/24 V a.c. for KVQ +
EKS 67
Grade of enclosure
IP 41: (plastic case)
IP 54: (silumin case)
Sensors
Pt 1000 ohm
1. Media sensor S1 for registering the
temperature of the refrigerated medium
2. Defrost sensor S2 for registering the
defrost temperature
Installation
Figs.3,5,6,7
Important! When mounting the unit in a panel
or when building it into a cabinet the isolating
spacer (fig. 6b) must be removed first.
Place defrost sensor S2 so that it registers a
representative temperature during defrosting.
The sensor can be placed in a protective cap
and mounted on a pipe.
Fig. 3a shows the placing of media
temperature sensor S1.
Where several refrigeration points are
involved, e.g. a row of refrigerated displays or
shelves is connected to the same suction line
with a KVQ-EKS 67 regulation, it is important
that sensor S1 registers a middle
temperature.
Four parallel and series connected Pt 1000
ohm sensors can be placed in a series of
refrigeration points. This gives better
registration of actual temperatures (see figs.
3c and 3d).
Connections
Connection of sensors S1 and S2
(Media temperature sensor and defrost
sensor). See figs. 4, 9.
The Pt 1000 ohm sensors are fitted with 2.5
m cable (2 x 0.20 mm
2
). If longer cable is
necessary, an extension can be made with
ordinary copper cable. However, it is
important that the total resistance of the cable
does not exceed 2 ohms. (2 ohms correspond
to a temperature variation of 0.5°C). See fig.
4.
Connection of inputs
See fig. 8
If several regulators are to be connected to
the same transformer they must all be in
parallel, i.e. terminal 2 to terminal 2, etc.
Note
In systems where transformer secondary side
earthing is required, the earth connection
must be made on the side of the transformer
that is connected to terminal 2 on EKS 67.
If screened cables are used, they must only
be connected at one end and only to the
regulator that is to be protected.
Connect the screen to terminal 2. Normally,
screened cables are not necessary with EKS
67.
External defrost timer
To be connected to terminals 2 and 10.
Defrosting is started by a signal from the
defrost timer. The timer has an ordinary make
function and must remain made for at least 2
seconds.
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