DIMENSIONAL DADIMENSIONAL DA
DIMENSIONAL DA
DIMENSIONAL DADIMENSIONAL DA
OVERALL DIMENSIONS AND PANEL CUTOUT
The dimensions are expressed in millimetres and inches (fifth-scale drawing).
ELECTRICAL CONNECTIONELECTRICAL CONNECTION
ELECTRICAL CONNECTION
ELECTRICAL CONNECTIONELECTRICAL CONNECTION
CONNECTIONS TO DERIVE
Instance of typical application.
BUILDER DABUILDER DA
BUILDER DA
BUILDER DABUILDER DA
EVCO S.r.l.
Via Mezzaterra 6, 32036 Sedico Belluno ITALY
Phone 0039/0437852468 (a.r.) Fax 0039/043783648
Internet addresses
e-mail: info@evco.it
http://www.evco.it
TO BE CAREFUL
This publication exclusively belongs to EVCO and shall not be reproduced and distributed if not expressly authorized by the same EVCO.
EVCO does not assume any responsibility in order to the characteristics, to the technical data and to the possible mistakes related herein or deriving from the use of the same.
EVCO can not be considered responsible for damages caused from the inobservance of the additional informations.
EVCO reserves the right to make any modification without prior notice and at any time without prejudice the basic functioning and safety characteristics.
TT
AA
T
A
TT
AA
Fig. 3
TT
AA
T
A
TT
AA
INSTINST
ALLAALLA
ALLA
ALLAALLA
TIONTION
TION
TIONTION
INST
INSTINST
WITH THE FIXING SYSTEM SUGGESTED BY THE BUILDER
Panel mounting, with the equipped screw brackets (fifth-scale drawing).
Fig. 4
Fig. 5
EK 820AEK 820A
EK 820A
EK 820AEK 820A
ON-OFF digital controller for quick cooler
management
Operating instructions
Version 1.01 of 30th September 2004
File ek820a_eng_v1.00.pdf
PT
IMPORTANT:
The use of this new instrument is easy; but for safety reasons, it is
important read these instructions carefully before the installation or
before the use and follow all additional informations.
It is very important keep these instructions with the instrument for future
consultations.
GENERAL INFORMAGENERAL INFORMA
GENERAL INFORMA
GENERAL INFORMAGENERAL INFORMA
WHAT IS THE USE
EK 820A is an ON-OFF digital controller studied for quick cooler management (of foods
at ambient temperature or pre-cooked) which basic characteristics are the management of
ten cycles of functioning, the one 1½ HP compressor management, the quick cooling
modality selection (for temperature or time), the needle probe proper insertion verify, the
“manual defrost and ventilation”; besides, the instrument is provided with one door
switch digital input configurable to interact on the outputs activity and with one
locking digital input configurable to interact on the instrument status.
In factory the instrument gets preset to accept at the measure inputs PTC probes used in
refrigeration field at the moment.
EK 820A is available in the 72 x 144 mm (2.83 x 5.66 in.) case and it is studied for panel
mounting with the equipped screw brackets.
GETTING STGETTING ST
GETTING ST
GETTING STGETTING ST
INSTALLATION
EK 820A was studied for panel mounting, panel cutout 67 x 138 mm (2.63 x 5.43 in.),
with the equipped screw brackets (the overall dimensions and the panel cutout are
related in Fig. 3, the fixing system suggested by the builder is related in Fig. 4).
ADDITIONAL INFORMATIONS
- the panel thickness must be included from 1 to 5 mm (0.04 to 0.19 in.)
- verify if the using conditions (ambient temperature, humidity, etc.) are within the
limits indicated by the builder (see the chapter TECHNICAL DATA)
- install the instrument in a location with a suitable ventilation, to avoid the internal overheating of the instrument
- do not install the instrument near surfaces that can to obstruct the air-grating
(carpets, covers, etc.), heating sources (radiators, hot air ducts, etc.), locations
subject to direct sunlight, rain, humidity, excessive dust, mechanical vibrations
or bumps, devices with strong magnetos (microwave ovens, big speakers, etc.)
- according with the safety norms, the protection against possible contacts with
electrical parts and parts protected with functional insulation only must be ensured
through a correct installation procedure of the instrument; all parts that ensure the
protection must be fixed so that they can not be removed if not with a tool.
ELECTRICAL CONNECTION
EK 820A is provided with two extractable screw terminal blocks for cables up to 2.5 mm²
(0.38in.², for the connection to the power supply, inputs and outputs) located on the instrument back panel (the connections to derive are related in Fig. 5 and they are checkable on the
polyester label stuck on the instrument case).
ADDITIONAL INFORMATIONS
- if the instrument is brought from a cold to a warm location, the humidity may
condense inside the instrument; wait about an hour before supply the instrument
- verify if the operating power supply voltage, electrical frequency and power of
the instrument correspond to the local power supply (see the chapter TECHNICAL
DATA)
- do not supply more instruments with the same transformer
- if the instrument is installed on a vehicle, its power supply must be derived directly from the battery of the vehicle
- give the instrument a protection able to limit the current absorbed in case of
failure
- the instrument remains connected to the local power supply as long as the terminals 27 and 28 are derived to the local power supply, even if the instrument is
apparently turned off
- if the instrument is supplied from low voltage use low voltage loads
- give the probes a protection able to insulate them against possible contacts with
metal parts or use insulated probes
- give the outputs a protection able to protect them against short circuit and overload
- do not try to repair the instrument; for the repairs apply to highly qualified staff
ARAR
AR
ARAR
TEDTED
TED
TEDTED
TIONSTIONS
TIONS
TIONSTIONS
- if you have any questions or problems concerning the instrument please
consult Evco (see the chapter BUILDER DATA).
USEUSE
USE
USEUSE
PRELIMINARY INFORMATIONS
After derived the connections related in Fig. 5, the instrument reproposes the last settings
stored; if a lack of power supply happens during the count of a time, when the power supply
recovers the count gets reproposed from the beginning.
Pushing and releasing the key T3 the instrument turning ON (status ON) or turning OFF
(status STAND-BY), except during the configuration parameters setting procedure; the
LED L3 is associated to the instrument status, it is turned ON during the status ON and
it is turned OFF during the status STAND-BY.
If an alarm should be active the display DY1 displays the alarm code flashing and the buzzer
utters an intermittent beep as long as the cause that has given it does not disappear (see the
chapter SIGNALS AND ALARMS); pressure on a key during an alarm permits to silence the
buzzer.
During the status STAND-BY the display DY1 displays the temperature read by the cabinet
probe and all outputs are forced to the status OFF.
EK 820A is provided with ten cycles of functioning and with some configuration
parameters that get stored in a non volatile memory and that permit to set the instrument
according with one’s requirements (see the chapter CONFIGURABILITY).
QUICK COOLING FOR TEMPERATURE CYCLE
Pushing and releasing the key T4 during the status STAND-BY the cycle gets selected, except
during the configuration parameters setting procedure; the LED L4 is associated to the quick
cooling cycle, it is turned ON when the cycle is selected and it is turned OFF when the cycle is
not selected.
Pushing and releasing the key T10 the quick cooling for temperature modality gets selected;
the LED L10 is associated to the quick cooling for temperature modality, it is turned ON when
the modality is selected and it is turned OFF when the modality is not selected.
Pushing and releasing the key T3 the cycle gets activated; the LED L1 is associated to the quick
cooling/freezing, it is turned ON when the quick cooling/freezing is running and it is turned OFF
when the quick cooling/freezing is not running.
18
ENGLISH
Fig. 1
Fig. 2
During this cycle the display DY1 displays the temperature read by the needle probe, if the
conditions permit it (the temperature read by the needle probe must be below the quick cooling/freezing for temperature enabling setpoint) the display DY2 displays the decrease of the
quick cooling for temperature maximum length and the LED L12 flashes to indicate that the
count of the time is running; keeping pushed the key T10 the display DY2 displays the fraction
of time passed from the moment in which the instrument activates the cycle.
The output K 1 is associated to the compressor and to the quick cooling setpoint, it remains
activated continuously as long as the temperature read by the cabinet probe reaches the quick
cooling setpoint and when it rises above the quick cooling setpoint of the hysteresis value
(differential) the output gets reactivated, except during a defrost and a dripping.
The output K 2 is associated to the evaporator fans and it is forced to the status ON, except
during a defrost cycle.
A defrost cycle provides three phases (defrost, dripping and evaporator fans stoppage) connected in cascade since the end of one automatically determines the passage to the following
one.
The output K 3 is associated to the defrost and it remains continuously activated during the
defrost as long as the temperature read by the evaporator probe reaches the defrost stopping
setpoint when the defrost ends and the instrument automatically moves to the dripping; if the
instrument was set to manage defrost to resistances (electrical) during a defrost the output K
1 gets forced to the status OFF and the output K 2 functioning gets established with the parameters of the family F, if the instrument was set to manage hot gas defrost (reversal of cycle)
during a defrost the output K 1 remains continuously activated and the output K 2 functioning
gets established with the parameters of the family F, if the instrument was set to manage air
defrost (open door) during a defrost the output K 1 gets forced to the status OFF and the output
K 2 gets forced to the status ON.
Passed the dripping length from the moment of the defrost end the instrument automatically
moves to the evaporator fans stoppage; if the instrument was set to manage defrost to
resistances (electrical) or hot gas defrost (reversal of cycle) during a dripping the outputs K 1
and K 2 get forced to the status OFF, if the instrument was set to manage air defrost (open
door) during a dripping the output K 1 gets forced to the status OFF and the output K 2 gets
forced to the status ON.
Passed the evaporator fans stoppage length from the moment of the dripping end the defrost
cycle ends; if the instrument was set to manage defrost to resistances (electrical) or hot gas
defrost (reversal of cycle) during an evaporator fans stoppage the output K 2 activation gets
disabled, if the instrument was set to manage air defrost (open door) during an evaporator
fans stoppage the output K 2 gets forced to the status ON.
Activating the door switch digital input the instrument interacts on the outputs activity according what established with the parameters of the family u.
Activating the locking digital input the locking digital input alarm gets activated.
When the temperature read by the needle probe falls below the quick cooling for temperature
stopping setpoint the cycle ends and the successful quick cooling/freezing for temperature
signal gets activated; keeping pushed the key T10 the display DY1 displays the temperature
read by the cabinet probe.
Passed the quick cooling for temperature maximum length, if the temperature read by the
needle probe is above the quick cooling for temperature stopping setpoint the unsuccessful
quick cooling/freezing alarm gets activated; keeping pushed the key T10 the display DY2 displays the fraction of time passed from the moment of the quick cooling for temperature maximum length end.
ADDITIONAL INFORMATIONS
- for the whole period of a corrupted memory data alarm the quick cooling for temperature cycle activation is refused
- for the whole period of a locking digital input alarm the quick cooling for temperature cycle activation is refused
- for the whole period of a needle probe failure alarm the quick cooling for temperature cycle activation is refused
- for the whole period of a cabinet probe failure alarm the quick cooling for temperature cycle activation is refused
- for the whole period of a door switch digital input alarm the quick cooling for temperature cycle activation is refused
- during a quick cooling for temperature cycle the instrument never automatically
presents a request of a defrost cycle, except what established with the parameter
d4.
QUICK COOLING FOR TIME CYCLE
Pushing and releasing the key T4 during the status STAND-BY the cycle gets selected, except
during the configuration parameters setting procedure; the LED L4 is associated to the quick
cooling cycle, it is turned ON when the cycle is selected and it is turned OFF when the cycle is
not selected.
Pushing and releasing the key T10 the quick cooling for time modality gets selected; the LED
L11 is associated to the quick cooling for time modality, it is turned ON when the modality is
selected and it is turned OFF when the modality is not selected.
To modify the quick cooling for time length push and release over and over the key T1 or T2 as
long as the display DY2 displays the desired value (keeping pushed the key T1 or T2 the value
gets decreased or increased more quickly).
Pushing and releasing the key T3 the cycle gets activated; the LED L1 is associated to the quick
cooling/freezing, it is turned ON when the quick cooling/freezing is running and it is turned OFF
when the quick cooling/freezing is not running.
During this cycle the display DY1 displays the temperature read by the cabinet probe, the
display DY2 displays the decrease of the quick cooling for time length and the LED L12 flashes
to indicate that the count of the time is running; keeping pushed the key T10 the display DY2
displays the fraction of time passed from the moment in which the instrument activates the
cycle.
The outputs K 1, K 2 and K 3 get activated with the same functioning saw in the case of quick
cooling for temperature cycle.
Activating the door switch digital input the instrument interacts on the outputs activity according what established with the parameters of the family u.
Activating the locking digital input the locking digital input alarm gets activated.
Passed the quick cooling for time length the cycle ends and the quick cooling/freezing for time
ended signal gets activated.
ADDITIONAL INFORMATIONS
- for the whole period of a corrupted memory data alarm the quick cooling for time
cycle activation is refused
- for the whole period of a locking digital input alarm the quick cooling for time cycle
activation is refused
- for the whole period of a cabinet probe failure alarm the quick cooling for time
cycle activation is refused
- for the whole period of a door switch digital input alarm the quick cooling for time
cycle activation is refused
- during a quick cooling for time cycle the instrument never automatically presents a
request of a defrost cycle, except what established with the parameter d4.
QUICK FREEZING FOR TEMPERATURE CYCLE
Pushing and releasing the key T5 during the status STAND-BY the cycle gets selected, except
during the configuration parameters setting procedure; the LED L5 is associated to the quick
freezing cycle, it is turned ON when the cycle is selected and it is turned OFF when the cycle is
not selected.
Pushing and releasing the key T10 the quick freezing for temperature modality gets selected;
the LED L10 is associated to the quick freezing for temperature modality, it is turned ON when
the modality is selected and it is turned OFF when the modality is not selected.
Pushing and releasing the key T3 the cycle gets activated; the LED L1 is associated to the quick
cooling/freezing, it is turned ON when the quick cooling/freezing is running and it is turned OFF
when the quick cooling/freezing is not running.
During this cycle the display DY1 displays the temperature read by the needle probe, if the
conditions permit it (the temperature read by the needle probe must be below the quick cooling/freezing for temperature enabling setpoint) the display DY2 displays the decrease of the
quick freezing for temperature maximum length and the LED L12 flashes to indicate that the
count of the time is running; keeping pushed the key T10 the display DY2 displays the fraction
of time passed from the moment in which the instrument activates the cycle.
The output K 1 is associated to the compressor and to the quick freezing setpoint, it remains
activated continuously as long as the temperature read by the cabinet probe reaches the quick
freezing setpoint and when it rises above the quick freezing setpoint of the hysteresis value
(differential) the output gets reactivated, except during a defrost and a dripping.
The outputs K 2 and K 3 get activated with the same functioning saw in the case of quick
cooling for temperature cycle.
Activating the door switch digital input the instrument interacts on the outputs activity according what established with the parameters of the family u.
Activating the locking digital input the locking digital input alarm gets activated.
When the temperature read by the needle probe falls below the quick freezing for temperature
stopping setpoint the cycle ends and the successful quick cooling/freezing for temperature
signal gets activated; keeping pushed the key T10 the display DY1 displays the temperature
read by the cabinet probe.
Passed the quick freezing for temperature maximum length, if the temperature read by the
needle probe is above the quick freezing for temperature stopping setpoint the unsuccessful
quick cooling/freezing alarm gets activated; keeping pushed the key T10 the display DY2 displays the fraction of time passed from the moment of the quick freezing for temperature maximum length end.
ADDITIONAL INFORMATIONS
- for the whole period of a corrupted memory data alarm the quick freezing for temperature cycle activation is refused
- for the whole period of a locking digital input alarm the quick freezing for temperature cycle activation is refused
- for the whole period of a needle probe failure alarm the quick freezing for temperature cycle activation is refused
- for the whole period of a cabinet probe failure alarm the quick freezing for temperature cycle activation is refused
- for the whole period of a door switch digital input alarm the quick freezing for
temperature cycle activation is refused
- during a quick freezing for temperature cycle the instrument never automatically
presents a request of a defrost cycle, except what established with the parameter
d4.
QUICK FREEZING FOR TIME CYCLE
Pushing and releasing the key T5 during the status STAND-BY the cycle gets selected, except
during the configuration parameters setting procedure; the LED L5 is associated to the quick
freezing cycle, it is turned ON when the cycle is selected and it is turned OFF when the cycle is
not selected.
Pushing and releasing the key T10 the quick freezing for time modality gets selected; the LED
L11 is associated to the quick freezing for time modality, it is turned ON when the modality is
selected and it is turned OFF when the modality is not selected.
To modify the quick freezing for time length push and release over and over the key T1 or T2 as
long as the display DY2 displays the desired value (keeping pushed the key T1 or T2 the value
gets decreased or increased more quickly).
Pushing and releasing the key T3 the cycle gets activated; the LED L1 is associated to the quick
cooling/freezing, it is turned ON when the quick cooling/freezing is running and it is turned OFF
when the quick cooling/freezing is not running.
During this cycle the display DY1 displays the temperature read by the cabinet probe, the
display DY2 displays the decrease of the quick freezing for time length and the LED L12 flashes
to indicate that the count of the time is running; keeping pushed the key T10 the display DY2
displays the fraction of time passed from the moment in which the instrument activates the
cycle.
The outputs K 1, K 2 and K 3 get activated with the same functioning saw in the case of quick
freezing for temperature cycle.
Activating the door switch digital input the instrument interacts on the outputs activity according what established with the parameters of the family u.
Activating the locking digital input the locking digital input alarm gets activated.
Passed the quick freezing for time length the cycle ends and the quick cooling/freezing for time
2 7
ended signal gets activated.
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