Technical da, How to order – EVCO EK820AP7 User Manual

Page 3

ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the quick freezing for time

cycle activation is refused

for the whole period of a locking digital input alarm the quick freezing for time

cycle activation is refused

for the whole period of a cabinet probe failure alarm the quick freezing for time

cycle activation is refused

for the whole period of a door switch digital input alarm the quick freezing for time

cycle activation is refused

during a quick freezing for time cycle the instrument never automatically presents

a request of a defrost cycle, except what established with the parameter d4.

COLD STORING CYCLE
Pushing and releasing the key T7 during the status STAND-BY the cycle gets selected, except

during the configuration parameters setting procedure; the LED L7 is associated to the cold

storing 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 T3 the cycle gets activated; the LED L2 is associated to the

storing, it is turned ON when the storing is running and it is turned OFF when the storing is not

running.
During this cycle the display DY1 displays the temperature read by the cabinet probe.
The output K 1 is associated to the compressor and to the cold storing setpoint, it remains

activated continuously as long as the temperature read by the cabinet probe reaches the cold

storing setpoint and when it rises above the cold storing setpoint of the hysteresis value (dif-

ferential) the output gets reactivated, except during a defrost and a dripping.
The output K 2 is associated to the evaporator fans and to the output deactivation setpoint, it

remains continuously activated as long as the temperature read by the evaporator probe reaches

the output deactivation setpoint and when it falls below the output deactivation setpoint of the

hysteresis value (differential) the output gets reactivated, except during a defrost cycle.
Passed the defrost interval from the moment in which the instrument activates the cycle or

from the moment in which the instrument presents a request of a defrost cycle, if the condi-

tions permit it (the temperature read by the evaporator probe must be below the defrost stop-

ping setpoint) the instrument automatically presents the following request of a defrost cycle.
A defrost cycle provides three phases (defrost, dripping and evaporator fans stoppage) con-

nected 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 param-

eters 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 accord-

ing what established with the parameters of the family u.
Activating the locking digital input the locking digital input alarm gets activated.
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the cold storing cycle acti-

vation is refused

for the whole period of a locking digital input alarm the cold storing cycle activa-

tion is refused

for the whole period of a door switch digital input alarm the cold storing cycle

activation is refused.

VERY COLD STORING CYCLE
Pushing and releasing the key T8 during the status STAND-BY the cycle gets selected, except

during the configuration parameters setting procedure; the LED L8 is associated to the very

cold storing 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 T3 the cycle gets activated; the LED L2 is associated to the

storing, it is turned ON when the storing is running and it is turned OFF when the storing is not

running.
During this cycle the display DY1 displays the temperature read by the cabinet probe.
The output K 1 is associated to the compressor and to the very cold storing setpoint, it remains

activated continuously as long as the temperature read by the cabinet probe reaches the very

cold storing setpoint and when it rises above the very cold storing 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 cold storing

cycle.
Activating the door switch digital input the instrument interacts on the outputs activity accord-

ing what established with the parameters of the family u.
Activating the locking digital input the locking digital input alarm gets activated.
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the very cold storing cycle

activation is refused

for the whole period of a locking digital input alarm the very cold storing cycle

activation is refused

for the whole period of a door switch digital input alarm the very cold storing cycle

activation is refused.

QUICK COOLING FOR TEMPERATURE AND COLD STORING CYCLE
Pushing and releasing the keys T4 and T7 during the status STAND-BY the cycle gets selected,

except during the configuration parameters setting procedure; the LED L4 and L7 are associ-

ated to the quick cooling and cold storing cycle, they are turned ON when the cycle is selected

and they are turned OFF when the cycle is not selected.
Ended the quick cooling for temperature phase the instrument automatically moves to the cold

storing phase.
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the quick cooling for tem-

perature and cold storing cycle activation is refused

for the whole period of a locking digital input alarm the quick cooling for tempera-

ture and cold storing cycle activation is refused

for the whole period of a needle probe failure alarm the quick cooling for tempera-

ture and cold storing cycle activation is refused

for the whole period of a cabinet probe failure alarm the quick cooling for tempera-

ture and cold storing cycle activation is refused

for the whole period of a door switch digital input alarm the quick cooling for tem-

perature and cold storing cycle activation is refused.

QUICK COOLING FOR TIME AND COLD STORING CYCLE
Pushing and releasing the keys T4 and T7 during the status STAND-BY the cycle gets selected,

except during the configuration parameters setting procedure; the LED L4 and L7 are associ-

ated to the quick cooling and cold storing cycle, they are turned ON when the cycle is selected

and they are turned OFF when the cycle is not selected.
Ended the quick cooling for time phase the instrument automatically moves to the cold storing

phase.
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the quick cooling for time

and cold storing cycle activation is refused

for the whole period of a locking digital input alarm the quick cooling for time and

cold storing cycle activation is refused

for the whole period of a cabinet probe failure alarm the quick cooling for time and

cold storing cycle activation is refused

for the whole period of a door switch digital input alarm the quick cooling for time

and cold storing cycle activation is refused.

QUICK FREEZING FOR TEMPERATURE AND VERY COLD STORING CYCLE
Pushing and releasing the keys T5 and T8 during the status STAND-BY the cycle gets selected,

except during the configuration parameters setting procedure; the LED L5 and L8 are associ-

ated to the quick freezing and very cold storing cycle, they are turned ON when the cycle is

selected and they are turned OFF when the cycle is not selected.
Ended the quick freezing for temperature phase the instrument automatically moves to the

very cold storing phase.
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the quick freezing for tem-

perature and very cold storing cycle activation is refused

for the whole period of a locking digital input alarm the quick freezing for tempera-

ture and very cold storing cycle activation is refused

for the whole period of a needle probe failure alarm the quick freezing for tempera-

ture and very cold storing cycle activation is refused

for the whole period of a cabinet probe failure alarm the quick freezing for tempera-

ture and very cold storing cycle activation is refused

for the whole period of a door switch digital input alarm the quick freezing for

temperature and very cold storing cycle activation is refused.

QUICK FREEZING FOR TIME AND VERY COLD STORING CYCLE
Pushing and releasing the keys T5 and T8 during the status STAND-BY the cycle gets selected,

except during the configuration parameters setting procedure; the LED L5 and L8 are associ-

ated to the quick freezing and very cold storing cycle, they are turned ON when the cycle is

selected and they are turned OFF when the cycle is not selected.
Ended the quick freezing for time phase the instrument automatically moves to the very cold

storing phase.
ADDITIONAL INFORMATIONS
-

for the whole period of a corrupted memory data alarm the quick freezing for time

and very cold storing cycle activation is refused

for the whole period of a locking digital input alarm the quick freezing for time and

very cold storing cycle activation is refused

for the whole period of a cabinet probe failure alarm the quick freezing for time and

very cold storing cycle activation is refused

for the whole period of a door switch digital input alarm the quick freezing for time

and very cold storing cycle activation is refused.

NEEDLE PROBE PROPER INSERTION VERIFY
Pushing and releasing the key T9 during the status STAND-BY the needle probe proper inser-

tion verify gets selected or unselected, except during the configuration parameters setting

procedure; the LED L9 is associated to the needle probe proper insertion verify, it is turned ON

when the verify is not selected, it is turned OFF when the verify is selected and it flashes when

the verify is running.
Pushing and releasing the key T3 the verify gets activated.
Passed the needle probe proper insertion verify length from the moment in which the instru-

ment activates a quick cooling/freezing for temperature cycle/phase, if the temperature read

by the needle probe is above the needle probe proper insertion verify stopping setpoint the

If the LED L9 flashes it means that the needle probe proper insertion verify is running.
If the LED L12 flashes it means that the count of a time is running.
If the display DY1 displays the indication “dEF” and the LED L6 is turned ON it means that a

defrost cycle is running.
If the display DY1 displays the indication “dEF” flashing and the LED L6 is turned ON it means

that a count of a delay time to a defrost cycle activation is running (see the parameters C0, C1

and C2).
If the display DY1 displays the indication “End” flashing and the buzzer utters an intermittent

beep for some seconds (successful quick cooling/freezing for temperature) it means that a

quick cooling/freezing for temperature cycle/phase positively is successful; the outputs K 1, K

2 and K 3 gets forced to the status OFF.
If the display DY1 displays the indication “End” flashing, the display DY2 displays the indica-

tion “0” and the buzzer utters an intermittent beep for some seconds (quick cooling/freezing

for time ended) it means that a quick cooling/freezing for time cycle/phase ended; the outputs

K 1, K 2 and K 3 gets forced to the status OFF.
ALARMS
If the display DY1 displays the indication “E2” flashing and the buzzer utters an intermittent

beep (corrupted memory data alarm) it means that there is a corruption of the configuration

data in the memory (turn OFF and turn ON again the instrument: if to the turning ON again the

alarm does not disappear the instrument must be replaced); during this alarm a cycle activation

is refused, if a cycle is running the cycle ends, the access to the configuration parameters

setting procedure is refused and all outputs get forced to the status OFF.
If the display DY1 displays the indication “E4” flashing alternated to the temperature read by

the cabinet/needle probe and the buzzer utters an intermittent beep (locking digital input

alarm) it means that the locking digital input is active (deactivate the locking digital input and

turn OFF and turn ON again the instrument, see the parameter u3); during this alarm a cycle

activation is refused and all outputs get forced to the status OFF.
If the display DY1 displays the indication “E0” flashing and the buzzer utters an intermittent

beep (cabinet probe failure alarm) it means that: the kind of connected cabinet probe is not

proper (verify the kind of connected cabinet probe), the cabinet probe is faulty (verify the

cabinet probe integrity), there is a mistake in the instrument-cabinet probe connection (verify

the instrument-cabinet probe connection integrity), the temperature read by the cabinet probe

is outside the limits permitted by the cabinet probe in use (verify that the temperature near the

cabinet probe be inside the limits permitted by the cabinet probe); during this alarm a quick

cooling/freezing cycle/phase activation is refused, if a quick cooling/freezing cycle/phase is

running the quick cooling/freezing cycle/phase ends, if a storing cycle/phase is running the

output K 1 functioning gets established with the parameters C5, C6 and C7, if a defrost cycle is

running the defrost cycle ends and the instrument never activates a defrost cycle.
If the display DY1 displays the indication “E3” flashing alternated to the temperature read by

the cabinet probe and the buzzer utters an intermittent beep (needle probe failure alarm) it

means that there is one of the faults saw in the previous case but referred to the needle probe;

during this alarm a quick cooling/freezing for temperature cycle/phase activation is refused.
If the display DY1 displays the indication “E1” flashing alternated to the temperature read by

the cabinet/needle probe and the buzzer utters an intermittent beep (evaporator probe failure

alarm) it means that there is one of the faults saw in the previous case but referred to the

evaporator probe; during this alarm if a storing cycle/phase is running and the parameter F0

has value 0 the output K 2 gets forced to the status OFF, if a defrost is running the defrost ends

and the instrument never activates a defrost cycle.
If the display DY1 displays the indication “]-[” flashing alternated to the temperature read by

the cabinet probe (door switch digital input alarm) it means that the door switch digital input

is active (deactivate the door switch digital input, see the parameters u0 and u2); during this

alarm a cycle activation is refused and gets given the action established with the parameter u0.
If the display DY1 displays the indication “]-[” flashing alternated to the temperature read by

the cabinet/needle probe and the buzzer utters an intermittent beep (door switch digital input

alarm) it means that the door switch digital input is active (deactivate the door switch digital

input, see the parameters u0, u1 and u2); during this alarm gets given the action established

with the parameters u0 and u1.
If the display DY1 displays the indication “dEF” alternated to the indication “]-[” and the buzzer

utters an intermittent beep (door switch digital input alarm during a defrost cycle) it means

that the door switch digital input is active during a defrost cycle and that the instrument was

set to manage defrost to resistances (electrical) or hot gas defrost (reversal of cycle) (deactivate

the door switch digital input, see the parameters u0, u1 and u2); during this alarm gets given

the action established with the parameters u0 and u1.
If the display DY1 displays the indication “dEF” alternated to the indication “]-[” (door switch

digital input alarm during a defrost cycle) it means that the door switch digital input is active

during a defrost cycle and that the instrument was set to manage air defrost (open door) (de-

activate the door switch digital input, see the parameters u0 and u2); during this alarm gets

given the action established with the parameter u0.
If the display DY1 displays the indication “o--” flashing and the buzzer utters an intermittent

beep (unsuccessful needle probe proper insertion verify) it means that the needle probe

proper insertion verify is unsuccessful (turn OFF and turn ON again the instrument, see the

parameters c7 and CE); during this alarm the outputs K 1, K 2 and K 3 get forced to the status

OFF.
If the display DY1 displays the temperature read by the needle probe, the display DY2 displays

the indication “0” flashing and the buzzer utters an intermittent beep (unsuccessful quick

cooling/freezing) it means that a quick cooling/freezing cycle/phase is unsuccessful (see the

parameters c1 and c2 or c4 and c5); inactive.
If the display DY1 displays the indication “End” flashing, the display DY2 displays the indica-

tion “---” flashing and the buzzer utters an intermittent beep (quick cooling/freezing ended

but unsuccessful) it means that a quick cooling/freezing cycle/phase is ended but it is unsuc-

cessful (see the parameters c1 and c2 or c4 and c5); during this alarm the outputs K 1, K 2 and

K 3 gets forced to the status OFF.
If the display DY1 displays the temperature read by the cabinet probe, the display DY2 displays

the indication “---” flashing and the buzzer utters an intermittent beep (quick cooling/freezing

ended but unsuccessful and storing activated) it means that a quick cooling/freezing phase

is ended but it is unsuccessful and that the instrument automatically moved to the storing

phase (see the parameters c1 and c2 or c4 and c5); inactive.
If the display DY1 displays the indication “AL” alternated to the temperature read by the cabi-

net probe and the buzzer utters an intermittent beep (temperature alarm) it means that the

temperature read by the cabinet probe is outside the limit established with the parameter

A1 or A2 or A3 or A4 (see the parameters A0, A1, A2, A3 and A4); inactive.
ADDITIONAL INFORMATIONS
-

the alarm codes are related in order of precedence.

TECHNICAL DA

TECHNICAL DAT

TECHNICAL DATA
Case:

plastic black (PP0), self-extinguishing.

Size:

72 x 144 x 79 mm (2.83 x 5.66 x 3.11 in.), with terminal

blocks.

Installation:

panel mounting, panel cutout 67 x 138 mm (2.63 x 5.43

in.), with the equipped screw brackets.

Type of protection:

IP 54.

Connections:

extractable screw terminal blocks with pitch 7.5 mm (0.29

in., power supply and outputs) and with pitch 5 mm (0.19

in., inputs) for cables up to 2.5 mm² (0.38 in.²).

Ambient temperature:

from 0 to +60 °C (+32 to +140 °F, 10 ... 90 % of not con-

densing relative humidity).

Power supply:

230 Vac, 50/60 Hz, 4 VA.

Insulation class:

II.

Alarm buzzer:

incorporated.

Measure inputs:

3 (cabinet, evaporator and needle probe) for PTC probes.

Digital inputs:

2 (5 V, 1 mA) of which one door switch configurable to

interact on the outputs activity and for NO or NC contact

and one locking configurable to interact on the instrument

status and for NO or NC contact.

Working range:

from -50 a +150 °C.

Setting range:

from -55 to +99 °C.

Timer setting range:

from 1 to 400 min. for the quick cooling/freezing for temperature,

from 0 to 999 min. for the quick cooling/freezing for time.

Resolution:

1 °C.

Display:

two 3-digit display 12.5 mm (0.49 in.) high red LED dis-

play with automatic minus sign, functioning status indica-

tors, programming status indicators.

Outputs:

four relays of which one 16 (2) A @ 250 Vac relay for one

1½ HP @ 250 Vac compressor (NO contact) management

and three 6 (2) A @ 250 Vac relays for evaporator fans (NO

contact), defrost system (change-over contact) manage-

ment and for cabinet light (NO contact) control.

Kind of defrost managed:

to resistances (electrical), to hot gas (reversal of cycle), and

to air (open door) automatic and manual.

Defrost management:

for interval, stopping temperature and maximum length.

HOW TO ORDER

CODING SYSTEM
Instrument name:

EK 820A.

Desired measure input:

P (for PTC probes).

Desired power supply:

220 (230 Vac).