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ENGLISH
Regulator type EKS 65 is an electronic PI-
regulator in a silumin case.
Technical data
: 2 → 18°C
Setting range
S
- S
2
1
Regulation principle
PI: proportional-integral
Regulation parameters
Amplification factor
= 1 → 5
K
p
Factory setting
K
: see marking on regulator
p
Integration time
= 30 → 300 s
T
n
Factory setting
T
: see marking on regulator
n
Refrigerant setting
R22, R134a, R 404A
-20 → +55°C
Ambient temperature
24 V a.c. ±10%
Supply voltage
50/60 Hz*)
Power consumption
3 VA
Enclosure
IP 54 to IEC 529, DIN 40050
with lid closed
Sensor
Pt 1000 ohm
*) The choice of transformer is conditional on the total power
consumption. Max. power consumption for TQ/PHTQ +
EKS 65 is 80 VA.
A class II transformator to CEE 15 must be
used.
Position list
See fig. 9
Indication lamps
Red (A): TQ power. Indicates pulses to the
expansion valve actuator.
Green (B): SP set point. Indicates that the
temperature differential ≤ ±1.0°C from the
reference setting (S
- S
).
2
1
Yellow (C): Indicates that the temperature
differential is outside SP ±1.0°C.
Setting functions
Settign knob (D) for reference setting (S
Scale 2 → 18°C.
Setting screw (E) for proportional amplification
K
factor
p
Scale 1 → 5
Factory setting K
: see marking on regulator.
p
Setting knob (F) for maximum evaporating
pressure, MOP, 0 → 6 bar.
Factory setting: see marking on regulator (no
MOP).
Refrigerant setting (G): Switch positon from left
to right: B, R134a, R404A, R22.
Position B is used for other refrigerants, contact
Danfoss.
Factory setting: R22.
Setting screw (H) for integration time T
Scale 30 → 300 s
Factory setting T
: see marking on regulator.
n
EKS 65
K
- K
max
min
See fig. 12.
The K
- K
potentiometer is used to match
max
min
the proportional bands of EKS 65 and TQ/
PHTQ to each other.
K
= max. actuator temperature
max
K
= min. actuator temperature
min
Installation
Regulator
See fig. 1
EKS 65 is placed where the ambient
temperature lies within the permissible range.
EKS 65 is supplied in a silumin case for panel
or surface mounting. By surface mounting, the
knockouts in the base of the silumin cae are
removed.
Corresponding holes are drilled in the mounting
plate.
By panel mounting a square hole is cut in the
panel, 138 x 138 mm ±1 mm.
The silumin case can then be fixed using the
bracket supplied.
Sensor
See fig. 2
Sensor S
must be located on the next lowest
1
distribution tube, as close to the evaporator as
possible.
Remember to apply heat-conductive paste and
insulate the sensor.
Sensor S
must be located on the first vertical
2
suction tube after the evaporator, provided this
is not more than 2 m from the evaporator. If the
only accessible tube is a horizontal suction
tube, the sensor should be located at least 1/2
metre from the evaporator.
An AKS 21A (surface sensor) is recommended
for thin-wall steel tube (s ≤ 3 mm) and copper
tube.
Remember to apply heat-conductive paste and
insulate the sensor.
An AKS 21W (immersion sensor) is
recommended for thick-wall tube (s > 3 mm).
- S
).
2
1
Connection
See figs. 7 and 8
Ordinary copper cable can be used for extend
the sensor cable. The total resistance must not
exceed 2 ohms.
When connecting to terminals 35 and 36, use
min. 2 x 0,20 mm
When connecting to terminals 77 and 78, the
cable dimension is determined from fig. 8.
Check
See fig. 10 and 11.
Check measurements must be taken before
installing the regulator.
Setting
See fig. 9.
Set ∆t (= S
- S
) by potentiometer (D).
2
1
Set amplification factor K
n
T
by screws (E) and (H).
n
Maximum Operating Pressure, MOP, is set with
button (F). The upper limit for evaporating
pressure is set with the MOP button. The set
limiting pressure will be the pressure that acts
under the valve diaphragm.
Set the refrigerant selector (G) to the refrigerant
used.
Instructions RI.1D.C3.52 © Danfoss 09/95
2
lead.
and integration time
p
Adjustment
See fig. 9
1. Set plant pressure and temperature
regulators on manual operation or cut them
out.
2. Set S
- S
on max. (= 18°C)
2
1
3. Reduce S
- S
by 2°C until the evaporating
2
1
pressure or suction gas temperature hunts.
4. Increase S
- S
until the hunting stops
2
1
5. The factory setting of K
and T
p
be sufficient
If another setting is required:
a. Increase K
p
b. Check whether the plant hunts under all load
conditions.
The check can be performed , for example,
with load changes.
c. Repeat points a and b if the plant does not
hunt
d. Reduce K
slightly when the plant hunts
p
e. Reduce T
n
f. Check as in point b
g. Repeat point e and f if the plant does not hunt
h. Increase T
slightly when the plant hunts
n
Function extension
Display
Connection for read-out ∆t (=S
26 and 29 (+).
Output signal: 100 mV/°C measured in realtion
to terminal: 26. 0 V = 0°C.
Minimum internal resistance in display: 100
kohm.
Forced opening / forced closing
Forced opening: Relay contact is cut in across
terminals 1 and 63.
Full power is applied to the actuator and the
valve opens completely.
Forced closing: Relay contact is cut in across
terminals 61 and 1.
Power to the actuator is cut off and the valve
closes.
Standby closing of TQ
The relay contact is made across terminals 64
and 1.
The temperature in the actuator is maintained at
20 K below the closing temperature (which is a
function of S
).
1
Note!
When connecting other electrical
equipment there must be no galvanic
connection between several regulators and
between a regulator and other equipment.
will normally
n
- S
) : terminals
2
1
5
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