KELD EKT8 Series User manual

Description
NTC/PTC probe and ºC / ºF scale can be set by the parameters.
The control features defrost synchronization among several thermostats,
intelligent defrost to reduce the power consumption, control for two
compressors, night set, error indication and alarms through the display and
the buzzer, communication and real-time clock.
It also features HACCP logging to record temperature and time of alarms
caused by out of limit temperatures or power fails.
SLINK multipurpose input allows to connect a KLKEY to easily program the
parameters or a communication module.
Model references
Installation
The thermostat must be located in a place protected from vibrations,
impacts, water and corrosive gasses.
Wiring
Avoid installing the cables of the probes and the digital input in the
proximity of any power cables.
Maintenance
After the installation there are no maintenance tasks required.
Clean the surface of the controller with a soft, damp cloth.
EKT8 series controllers have been specifically designed for refrigeration
applications. Friendly use thanks to the display with symbols and 8 keys to
make it easy to program the parameters and access to functions such as
turning on/off the control, the light or forcing defrost.
Models up to 5 relays are available. First relay drives the compressor and
the other four can be configured to drive defrost, fan, light or alarm. It also
includes 3 temperature probe inputs and 2 configurable digital input.
The model reference is given by: EKT8V DW XYZ
Each suffix can take the following values:
V Model depending on table
D Probe PTC/NTC selectable by parameter
W Terminals T:Screw F:Fast-on
X Loads L:2 Wires C: Direct
Y Color R:Red, G:Green, B:Blue
Z Supply voltage 90255:115-230Vac 12:12Vac/dc
Panel cut-out:
Use the gasket or apply silicone to make it leaktight. Fix the thermostat with
the supplied screws. Put the screw covers.
Never use abrasive detergents, petrol, alcohol or solvents.
All the repairs must be carried out by authorised people.
EKT8
Digital Temperature Controller
Wiring Diagram
ETDT1515I_101203 ETDT1515I_101203
Technical Data
Storage temperature from -20ºC to 80ºC (from -4ºF to 176ºF)
Operating temperature from 0ºC to 55ºC (from 32ºF to 131ºF)
Temperature probe PTC / NTC
Probe range PTC from -50ºC to 150ºC (from -58 to 302ºF)
NTC from -50ºC to 110ºC (-58 to 230ºF)
Accuracy Better than 1% of full scale
Front Operation
Set Point Setup
- Press key Set The Set label appears.
- Press Set again. Current set point value appears blinking.
- Press or o increase or decrease the value.
- Press Set to confirm the new value.
- Press Set and to exit
Supply voltage 90-255 Vac 50/60Hz
Supply powers 3VA
Resolution 0.1º
Display 3-digits plus sign
SLINK For KLKEY and Communication
Outputs
OUT1 Model 1HP SPST Relay Resistive Load 16A
1HP 240Vac -- 10FLA, 60LRA 240Vac
Model 2HP SPST Relay Resistive Load 20A
2HP 240Vac -- 12FLA, 72LRA 240Vac
OUT2 SPDT Relay Resistive Load 8A 240Vac
OUT3 SPST Relay Resistive Load 8A 240Vac
OUT4
OUT5 SPDT Relay Resistive Load 16A
1HP 240Vac -- 10FLA, 60LRA 240Vac
Maximum current per position 20A
Dimensions 184 x 39 x 64 mm (7.24 x 1.53 x 2.52 in)
Front Protection Ip65
Parameter description - Continuation
d12 = Fan & defrosting control probe
sd1 = ambient probe.
sd2 = defrosting probe
sd3 = product probe
d13 = Intelligent defrosting
off = disabled
Jup = skip defrosts
Cic = vary defrosting cycle
d14 = Units to count the defrosting cycle
rt = according to the time of working of the controller.
ct = according to the time of working of the compressor.
d15= minimum evaporator set
If evaporator temperature is above d15 the time for defrosting cycle is not
counted. Only enabled if d3 is not set to off.
d16= maximum defrost time %
Percentage of d2 set as normal defrosting time.
d17= Cycle time variation
Value of increment or decrement of d8
Hde = Hour(Hde):Minutes(Mde) of next defrost
Mde =Hour(Hde):Minutes(Mde) of next defrost
if d14=ct or d13 different of oFF Hde:Mde is the time until next defrost
JdF= Smart defrost information
d13= jup Defrosts to skip
d13= CiC increment of d8
PROBES
P0 = ºC or ºF, Temperature scale
P1 = Ambient probe calibration
Degrees shift of the ambient probe.
P2 =
Degrees shift of the defrosting probe.
P3 = Product
Degrees shift of the product probe.
P4 = Decimal point
P5=Probe to be viewed normally on the display.
sd1 = ambient probe.
sd2 = defrosting probe.
sd3 = product probe
P6 = Probe 2 Defrosting present.
If there is a probe 2 connected to thermostat
P7 = Probe 3 Product present.
If there is a probe 3 connected to thermostat
A0 = Fan & alarm differential.
This is the temperature difference between the on and off cycle of the
alarms and fan
A1 = Maximum alarm.
High alarm ON at Set+A1. High alarm OFF at Set+A1-A0.
A2 = Minimum alarm.
Low alarm ON at Set-A2. Low alarm OFF at Set-A2+A0.
A3 = Digital Input alarm time validation.
If E0=In or E0=Al, time since the situation occurs, until it is given.
A4 = Temperature alarm exclusion time after defrosting.
During the defrosting, and this time after it, temperature alarms will be
ignored.
A5 = Temperature alarm exclusion time after opening the door.
While the door is open (if A5>0) and time A5 after closing it, alarms will be
ignored.
A6 = Temperature alarm exclusion after connection.
Until this time has elapsed since the connection, temperature alarms will
be ignored.
A7 = Temperature alarm time validation.
Time since the alarm situation occurs, until it is given.
A8 = Probe Alarm.
sd1 = ambient probe
sd2 = defrosting probe
sd3 = product probe
(Pro)
Defrosting probe calibration
probe calibration
ALARMS(ALA)
INITIALIZATION (INI)
Hor = Hour
Min = Minutes
E0, E1 = Digital input configuration.
Off = Digital input disabled.
Al = External alarm. There is an alarm if input is short-circuited.
In = Door open if input is short-circuited.
def = Order to initiate a defrost if input is short-circuited (only E0).
ndf = No defrosting will be made if input is short-circuited.
rst= If input is short-circuited Set Point becomes Set+r4
H0 = Factory Configuration. Record Factory Configuration.
H1 = Master/Slave
H1=Master. The thermostat issues defrosting orders to slave connected
thermostats through the digital input
H1=Slave. The thermostat performs defrosting ordered by the master
connected to its digital input.
In both cases the input must be E0=def
H2 = Keyboard protection.
Yes =Keyboard protected. To modify Set, activate/de-activate defrosting and
activate/de-activate continuous cycle we have to enter the code and then
quit. The protection is removed momentarily. It is activated again 1 minute
after the last key is pressed.
No = Keyboard not protected.
H3 = Delay time on connecting.
Until this time has elapsed since turning-on power, the compressor will not
start-up.
H4 = Address for serial communication.
H5 = Input code to parameters.
This code is set to 00 from factory.
H6 = Type of Probe
PTC or NTC
H7 = Configuration Relay 2 , H8 = Configuration Relay 3
H9 = Configuration Relay 4 and H10 = Configuration Relay 5
We can choose that it is Light (Lit), Fan (Fan), Alarm (ALA), Defrosting
(dEF) or 2nd compressor (Con (Only H9)).
H11 = HACCP
Enables temperature alarm recording.
dat = Date Day, month, year
td = Display refresh time
If the measures temperature increases over 1 degree in this time, displayed
temperature only will be increased 1 degree
Model Table
OUT5 OUT3
N L
OUT2
In2 In1 Sd1
1 2 3 6 7 8 9 10 11 12 15 16 17 18 19 204 5
OUT4
13 14 21 22
OUT1
INPUTS
SUPPLY
INTERNAL
BUZZER
S. LINK
Sd2Sd3
OUT5 OUT3
N L
OUT2
In2 In1 Sd1
1 2 3 6 7 8 9 10 11 12 15 16 17 18 19 204 5
OUT4
13 14 21 22
OUT1
INPUTS
SUPPLY
INTERNAL
BUZZER
S. LINK
Sd2Sd3
Compressor Relay 16A=1HP 20A=2HP Second Relay 8A Third Relay 8A Fourth Relay 16A Fifth Relay 16A Heat or Cooling Control Smart Defrosting Buzzer Real Time Clock
EKT823 16A **
EKT823B 16A ***
EKT823BR 16A ****
EKT823H 20A **
EKT823HB 20A ***
EKT823HBR 20A ****
EKT833 16A ***
EKT833B 16A ****
EKT833BR 16A *****
EKT833H 20A ***
EKT833HB 20A ****
EKT833HBR 20A *****
EKT843 16A ****
EKT843B 16A *****
EKT843BR 16A ******
EKT843H 20A ****
EKT843HB 20A *****
EKT843HBR 20A ******
EKT853 16A *****
EKT853B 16A ******
EKT853BR 16A *******
EKT853H 20A *****
EKT853HB 20A ******
EKT853HBR 20A *******
DIRECT LOADS
2 WIRE LOADS
ELECTRONICAELECTRONICA
Electrónica Keld, S.L.
Pol.Ind. Empresarium. C/Lentisco 15
50720 - La Cartuja Baja, ZARAGOZA
Spain
Phone: [phone]
Fax:[phone]
E-mail: [e-mail]
Web: http://www.keld.es
Electrónica Keld, S.L. Phone: [phone]
Pol.Ind. Empresarium. C/Lentisco 15 Fax:[phone]
50720 - La Cartuja Baja, ZARAGOZA E-mail: [e-mail]
Spain Web: http://www.keld.es
MAX.
20A
Specification and Operating Instructions
165mm
165mm
150mm150mm
31mm31mm
m3mm3m

Front Operation
Time programming
- Press key Set. The Set label appears.
- Press or to go to Hour or Minute
- Press Set to see the value.
- With and set the desired new value.
- Press Set. for 8 seconds, Pro will appear on the display once the time has
been correctly programmed
-Press Set and to quit or wait for 1 minute (keyboard timeout).
Parameter programming
-The parameters are grouped in the menus COM, DEF, PRO,ALA, INI, HAC
- Press Set for 8 seconds. Value 00 appears blinking.
- Set the code with and (it is set to 00 from factory).
- Press Set to confirm the code. If it is right, the label of the first menu will
appear.
- With and go to the desired menu.
- Press Set, the label of the first parameter of menu will appear.
- With and go to the desired parameter label of the list of parameters.
- Press Set to see the value.
- With and set the desired new value.
- Press Set to confirm it and exit to the parameter label.
-Press Set + to go to menu list.
-Press Set + to quit programming or wait 1 minute (keyboard timeout).
Date programming
Access to parameter as explained in Parameter programming, select INI
menu and dat parameter.
- Press key Set. The day (d00) appears.
- Press or to go to Day or Month or Year.(d00, M00,Y00)
- Press Set. for 8 seconds, display will blink.
- With and set the desired new value.
- Press Set. for 8 seconds, Pro will appear on the display.
To record a standard configuration
- Access to parameter H0 as explained in Parameter programming.
- Press Set for 8 seconds, and the thermostat will be reset.
Manual Defrost.
Pressing key for 8 seconds defrost is activated. Repeating the
operation is deactivated.
Continuous cold cycle.
Pressing key for 8 seconds a continuous cold cycle begins.
Repeating the operation the cycle finalizes.
Setting keyboard code to zero
The keyboard code can be programmed to zero by turning off the controller,
and turning it on again, while the key is pressed.
Alarm validation
An active alarm can be validated (the alarm output will be turned off)
pressing the key. If buzzer is present, it will be muted.
Pressing key for 5 seconds the thermostat will turn-on or turn-off.
If we have a relay setup as light, pressing key for 5 seconds the
thermostat will turn-on or turn-off the light
Pressing key for 5 seconds the thermostat will turn-on or turn-off
relay setup as
Led Indications
t indicates Compressor connected. It blinks when a
continuous cold cycle has to be initiated and has to wait until
the minimum compressor stoppage time is over.
t indicates Compressor 2 connected. It blinks when a
continuous cold cycle has to be initiated and has to wait until
the minimum compressor stoppage time is over.
t indicates that a defrost is running
t indicates that fan is connected
t indicates
It indicates HACCP record is activated
EKT82: H0 = 0; EKT83: H0 = 1; EKT84: H0 = 2; EKT85: H0 = 3
Set
Mute
ON/OFF
ON/OFF Light
ON/OFF Aux
Aux the
Aux
I
I
I
.
I
I error or alarm. It is blinking when the alarm is
validated for user
OUT2OUT2
HACCPHACCP
-Display Messages
In normal operation the probe temperature selected by P5 will be displayed. The
following messages can also appear :
- Err Memory reading error.
- ErP1, ErP2, ErP3 Probe1 , 2 or 3 error
- Eri Internal parameter error. In this case, enter the standard configuration, as it is
indicated in “To record a standard configuration”.
- ALH High temperature alarm.
- ALL Low temperature alarm.
- ALE External alarm.
- AEH High temperature and external alarm.
- AEL Low temperature and external alarm.
- ooo Open probe.
- - - - Short-circuited probe.
- DON Defrosting activated.
- DOF Defrosting de-activated or cannot be done.
- CON Continuous cold cycle activated.
- COF Continuous cold cycle de-activated or cannot be done.
- -d- Thermostat on defrosting.
- OFF Thermostat OFF.
To view the probe not chosen by P5, press Set+
The display blinks when there is an error recording a parameter in memory or when
awaiting confirmation of a value.
Operation in Error Case
If the ambient probe fails, the thermostat will connect the compressor according to
parameters c2 and c3, being able to perform defrosting and continuous cold cycles.
If the memory fails the thermostat will connect the compressor ON for 5 minutes and
OFF for 5 minutes, not being able to perform defrosting or continuous cold cycles.
Operation with 2 compressors
In this case when Sd1>=Set+r0 the compressor with less hours of working is turned on
first and after c6 delay the second compressor is turned on.
When Sd1<Set+r0/2 the second compressor is turned off and when Sd1<Set the first
compressor is turned off.
If before turning off the first compressor Sd1>=Set+r0 the second compressor is
turned on again.
HACCP
If this option is activated, the thermostat registers up to 5 alarms of the types High, Low,
and blackout. These alarms can be seen in the menu Registry of Alarms (HAC). To
access to this menu, proceed as for the parameters menu.
The first value that appears is the number of registered alarms. Afterwards, for each
alarm (if it has existed), the value of the temperature, the time and date (only models
with real time clock) and elapsed time of the alarm. For the disconnection alarm, the
temperature, the time and date (only models with real time clock) when returning the
connection is registered, as well as the time until the correct values are reached.
(Probe<Set+A1-A0)
When the elapsed time is showed it will appear xxd (days).Pressing xxH (Hours)
will be shown, and pressing again, xxn (Minutes) will be displayed. When located
over a temperature of alarm or time, pressing + during 2 seconds, both recorded
data of the alarm (time and temperature value) are deleted.
In the HAC menu, and pressing + keys during 2 seconds, all the recorded data of
alarms are deleted.
Defrosting Cycles
Intelligent Defrosting
By d13 parameter the time between defrost cycles can vary. The time is only counted if
defrost probe is below the evaporator set d15.
Selecting d13=jup some of the defrosts will be skipped. After a defrost the following
JdF defrosts will be ignored. JdF is initially 0. If a defrost ends before a time d16*d2
then JdF is incremented, otherwise is decremented. Maximum value for JdF is 3.
When JdF is 3 if the next defrost ends before a time d16*d2 then JdF is set to 1,
otherwise is set to 0.
Selecting d13=Cic the defrosting cycle can vary.
If a defrost ends before a time d16*d2 then time between defrosts is incremented d17
minutes, otherwise is decremented. The initial and minimum value for time between
defrost is d8. The number of times that it is incremented it can be seen in JdF.
SLINK
This input allows to connect a programming key to read or to write the parameters.
It also admits a clock module so that the hour of the thermostat goes with a real
time clock.
If the system is managed with a PC it can be connected it to the thermostat through
this input with a communication module
The cycles of defrosting can be performed counting total time (d14= rt) or counting
the time only when the compressor is connected (d14= ct).
If d14= rt, first defrosting will be always made at the hour d3 and the others with the
cycle given by d8.
If d14= ct, defrosting will be always made with the cycle given by d8.
Manual defrosting do not modify the programmed.
Parameter list
Con Description Units Range Factory
Set Set point Degrees r1 to r2 3.0
r0 Differential or hysteresis Degrees 0.1 to 20 1.0
r1 Minimum value for set point Degrees -99.9 to r2 -50.0
r2 Maximum value for set point Degrees r1 to 302 150.0
r4 Night Set Point Variation Degrees -20.0 to 20.0 0.0
r6 Fan operation Range off /on /con con
F0 Fan stoppage temperature Degrees -99.9 to 302 28.0
F1 Fan/compressor stop if door opened Option no/yes/Con/Fan yes
c0 Minimum compressor stoppage time Minutes 0 to 240 1
c1 Continuous cycle time h - m 0.0 to 18 1.0
c2 ON time of fault cycle Minutes 0 to 999 5
c3 OFF time of fault cycle Minutes 0 to 999 5
c4 Minimum ON time Minutes 0 to 240 0
of the compressor
c5 Minimum time between two Minutes 0 to 240 1
connections of the compressor
c6 Time delay for 2nd compressor Seconds 0 to 999 30
DEF Description Units Range Factory
d0 Type of defrosting Range re /in re
d1 Temperature at which defrosting Degrees -99.9 to 302 80.0
will stop
d2 Maximum defrosting time Minutes 0 to 240 30
d3 First Hour of Day for Defrosting h-m 00.0 to 18.0 00.0
d4 Delay of first defrosting Minutes 0 to 999 0
d5 Display on defrosting Range off/on/-d- -d-
d6 Display return limit. Minutes 0 to 240 15
d7 Compressor drip time. Minutes 0 to 240 0
d8 Interval between defrosting h - m 00.0 to 18.0 8.0
d9 Fan works on defrosting Range no/yes no
d10 Fan drip time Minutes 0 to 240 0
d11 Minimum Defrosting time Minutes 0 to 240 0
d12 Fan/defrosting control probe Range sd1/sd2/sd3 sd2
d13 Smart Defrosting Option off / jup / Cic off
d14 Units to count the defrosting cycle Option rt / ct rt
d15 Evaporator set Degrees -50.0 to 20.0 -10.0
d16 d2 maximum time % Numeric 0 to 100 50
d17 CiC time variation Minutes 0 to 120 10
HdE Next defrost time(hours) Hours (read only)
MdE Next defrost time (minutes) Minutes (read only)
JdF Defrosts to skip Numeric (read only)
Pro Description Units Range Factory
P0 Temperature scale Option ºC/ºF ºC
P1 Ambient probe 1 calibration Degrees -20.0 to 20.0 0.0
P2 Defrosting probe 2 calibration Degrees -20.0 to 20.0 0.0
P3 Product probe 3 calibration Degrees -20.0 to 20.0 0.0
P4 Decimal point Option no/yes yes
P5 Probe to display Range sd1/sd2/sd3 sd1
P6 Probe 2 present Option no/yes yes
P7 Probe 3 present Option no/yes no
ALA Description Units Range Factory
A0 Fan and alarm differential Degrees 0.1 to 20.0 4.0
A1 Maximum alarm temperature Degrees 0.1 to 99.9 8.0
A2 Minimum alarm temperature Degrees 0.1 to 99.9 8.0
A3 Minutes 0 to 999 10
A4 Time without temperature alarm after h - m 0.0 to 18.0 1.1
Defrosting
A5 Time without temperature alarm after h - m 0.0 to 18.0 1.1
opening the door
A6 Time without temperature alarm h - m 0.0 to 18.0 1.1
after connection
A7 Alarm verification time h - m 0.0 to 18.0 1.1
A8 Probe for alarm Range sd1/sd2/sd3 sd1
InI Description Units Range Factory
Hor Hour Hours 0 to 23 0
Min Minutes Minutes 0 to 59 0
E0 Configure digital input Range off/Al/In/def/rst off
E1 Configure digital input Range off/Al/In/rst off
H0 Factory Settings Range 0 to 3
H1 Master/Slave Range Mst / slu Mst
H2 Keypad protection Option no/yes no
H3 Delay time on connecting Seconds 0 to 240 0
H4 Address for serial communication Numeric 0 to 999 0
H5 Keyboard code Numeric 0 to 999 0
H6 Type of probe Option ptc / ntc ptc
H7 Relay 2 Setup Option Au/Lit/FAn/ALA/dEF dEF
H8 Relay 3 Setup Option Au/Lit/FAn/ALA/dEF Fan
H9 Relay 4 Setup Option Au/Lit/FAn/ALA/dEF/Con Lit
H10 Relay 5 Setup Option Au/Lit/FAn/ALA/dEF ALA
H11 HACCP Activated Option no/yes no
dat Date Day/Month/Year 1.1.0
td Display refresh time Seconds 0 to 999 0
Some of the parameters may not be present depending on the model.
Digital Input alarm time validation
Hour/Minutes Parameters H-M
It is a way to show hours and minutes in 3 digits
The two first digits are the hours and the third the tens of minutes. E.g.
2.4 2 hours 40 minutes
8.0 8 hours 0 minutes
10.3 10 hours 30 minutes
COMPRESSOR
c2 = ON time of fault cycle, when ambient probe is broken
c3 = OFF time of fault cycle, when ambient probe is broken
Minimum time between two connections of the compressor
(DEF)
Parameter description
(CON)
SET = Work set point.
Temperature we wish to maintain the machine. Variable between r1
and r2.
r0 = Differential.
When ambient probe temperature >= Set+r0 : Out ON
When ambient probe temperature <= Set : Out OFF
r4 = Night Set Point Variation
When the digital input is closed the Set Point is incremented r4. On this purpose
set E0= rst or E1= rst.
r6 = Fan operation on regulation.
Off = Fan does not connect on regulation.
On = Fan is always connected on regulation.
Con= Fan linked to compressor start-up.
(Fan ON if allowed by the temperature given by F0)
F0 = Fan temperature limit.
Fan OFF on regulation when probe temperature setup in d12 is >= F0.
Fan ON on regulation, when temperature is =< F0-A0.
The operation of the fan on regulation is determined also by r6.
F1 = Fan stop if door opened.
On regulation and continuous cycle when opening the door
No = The fan and compressor do not stop.
Yes = Both stop.
Con = The compressor stops.
Fan = The fan stops.
c0 = Minimum compressor stop time
Minimum time since compressor stops until it is starts again.
c1 = Continuous cycle time.
Duration of a continuous cold cycle.
c4 = Minimum time of working of the compressor
Minimum time since compressor starts until it stops.
c5 =
Minimum time since compressor starts until it starts again.
c6 = Time delay for 2nd Compressor
Time from first compressor is turned on until second compressor is turned on
(if it is necessary and H9=Con).
Defrosting
d0 = Type of defrosting.
re = defrosting without connecting the compressor.
in = defrosting by connecting the compressor.
d1 = End of defrosting temperature.
When this temperature is reached the defrosting will end.
d2 = Maximum defrosting time.
The defrosting will stop when this time is reached.
If it is zero there will be no defrosting.
d3 = first Hour defrosting of the day
From 00:00 hours the first defrosting is at d3 hours.
Until this time no defrosting is performed
d4 = Delay first defrosting.
Time without defrosting after turning the thermostat on.
d5 = Display during the defrosting.
Off = The current temperature will be shown during defrosting.
On = The temperature at defrost beginning is frozen on display until the end of
defrosting and until the current temperature is equal or lower than the initial
one, or until d6 time elapses.
def = Label -d- is displayed during defrosting, until the end of defrosting and
until the current temperature is equal or lower than the initial one, or until d6
time elapses.
d6 = Display return limit.
Maximum time before viewing the current temperature again after defrosting.
d7 = Compressor drip time.
Time since defrosting ends until the compressor can be connected.
d8 = Interval between defrosting.
Time between the start of a defrosting and the start of the following one.
If it is zero defrosting is not done automatically by time.
d9 = Fan operation during defrosting time.
It determines if the fan is connected or not during defrosting.
d10 = Fan drip time.
Time since defrosting ends until fan can be connected.
d11 = Minimum Time duration defrosting
Once defrosting begins it stays at least during this time