EVCO EC6708 User Manual

EC 6-708EC 6-708

Digital controller for refrigerating
power plant management

Operating instructions
File ec6708_eng_v1.01.pdf

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.

ENGLISH

INDEX

Summary

SUMMARY

Index page 2

Summary page 2

General informations page 3

What is the use page 3

Getting started page 4

Installation page 4
Electrical connection page 4

Instrument description page 5

Terminal blocks page 5
Keys page 5
LED page 6
Displays page 6

Before the use page 8

Settings to execute before the use page 8

Functioning page 9

Preliminary informations page 9
Suction pressure regulation page 9
Compressors protection page 10
Users total working hours counter cleaning page 11
Manual power steps loading/unloading page 11
Condensing quantity regulation page 12
Analog output page 13
Digital inputs page 13
Lower pressure alarm page 14
Upper pressure alarm page 15
Upper condensing quantity alarm page 15
Notes page 17
Summarizing flowchart page 18

User Menu configuration parameters page 32

Configuration parameters and default values
summarizing table page 40

Configurator Menu configuration parameters page 40
Operator Menu configuration parameters page 40
User Menu configuration parameters page 42

Signals and alarms page 45

Signals page 45
Alarms page 46

Dimensional data and installation page 50

Overall dimensions page 50
Installation page 50

Electrical connection page 51

Connections to derive page 51

Technical data page 52

Technical data page 52
How to order page 52

Conversion factors page 53

Temperature page 53
Pressure page 53

Builder data page 54

Builder data page 54

Notes page 55

Notes page 55

Working setpoint page 24

Working setpoint setting (working suction pressure) page 24
Working setpoint page 24

Configurator Menu page 25

Configuration parameters setting page 25
Configurator Menu configuration parameters page 26

Operator Menu page 29

Configuration parameters setting page 29
Operator Menu configuration parameters page 29

User Menu page 32

Configuration parameters setting page 32

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WHAT IS THE USE

EC 6-708 is a digital controller studied for refrigerating power plant
management up to eight compressors/condenser fans which basic
characteristics are the setting of the user to associate to every relay
output (condenser fans, compressor or choking valve), to subject the
compressors activation to the compressors powers and to the com­pressors total working hours, to read and to control the suction probe
and the condensing quantity (pressure/temperature); besides, the in­strument is provided with twelve digital inputs configurable to interact
on the relay outputs activity and with one analog output associated to
the condenser fans.
In factory the instrument gets preset to accept at the measure inputs 2
wires 4-20 mA pressure transducers/PTC probes (these last for the
condensing probe only).
EC 6-708 is available in the 160 x 90 mm (6.29 x 3.54 in., 9 DIN
modules) case and it is studied for DIN standard rail installation.

GENERAL INFORMATIONS

What is the use

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GETTING STARTED

Installation - Electrical connection

INSTALLATION

EC 6-708 was studied for DIN EN 50022 standard rail installation ac­cording with DIN 43880 norms (see the chapter Dimensional data and
installation on the page 50).

Additional informations

• verify if the using conditions (ambient temperature, humidity,
etc.) are within the limits indicated by the builder (see the
chapter Technical data on the page 52)

• 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

EC 6-708 is provided with seven screw terminal blocks for cables up to
2,5 mm² (0.38 in.²) located on the instrument frontal panel (see the
chapter Electrical connection on the page 51).

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 on the page 52)

• 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 115 and 118 are derived to the local
power supply, even if the instrument is apparently turned off

• give the relay 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

• if you have any questions or problems concerning the instru­ment please consult Every Control (see the chapter Builder
data on the page 54).

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INSTRUMENT DESCRIPTION

Terminal blocks - Keys

TERMINAL BLOCKS

1 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the condenser fans safety digital input

• to the upper condensing quantity digital input

• to the lower pressure digital input

• to the measure inputs

2 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the user associated to the output K1 ... 8 locking digital
inputs

• to the freon level digital input

16 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the outputs K5, K6, K7 and K8 (for condenser fans, compres­sors or choking valves management)

17 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the outputs K1, K2, K3 and K4 (for condenser fans, compres­sors or choking valves management)

18 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the power supply

24 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the analog output

25 screw terminal block for cables up to 2.5 mm² (0.38 in.²) for the

connection

• to the outputs Al1 and Al2 (for instrument locking and alarms
management).

KEYS

3 menu key ; it permits

• to turn out from the users total working hours counter clean­ing procedure

• to turn out from the manual power steps loading/unloading
procedure

• to gain access to the configurator and Operator Menu con­figuration parameters setting procedure

• to turn out from the configurator and Operator Menu configu­ration parameters setting procedure

• during the configurator, operator and User Menu configura­tion parameters setting procedure, to select a configuration
parameters family

4 down key ; it permits

• during an alarm, to silence the buzzer

• during the users total working hours counter cleaning proce­dure, to clear the counter

• during the manual power steps loading/unloading procedure,
to unload a power step

• during the working setpoint setting procedure, to decrease
the working setpoint value

• during the configurator, operator and User Menu configura­tion parameters setting procedure, to select a configuration
parameter

• during the configurator, operator and User Menu configura­tion parameters setting procedure, to decrease a configura-

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INSTRUMENT DESCRIPTION

Keys - LED - Displays

tion parameter value

5 up key ; it permits

• during the manual power steps loading/unloading procedure,
to load a power step

• during the working setpoint setting procedure, to increase the
working setpoint value

• during the configurator, operator and User Menu configura­tion parameters setting procedure, to select a configuration
parameter

• during the configurator, operator and User Menu configura­tion parameters setting procedure, to increase a configura­tion parameter value

6 set key ; it permits

• during the manual power steps loading/unloading procedure,
to display a power step status

• during the users total working hours counter cleaning proce­dure, to display a user total working hours

• to display the working setpoint value

• during the configurator, operator and User Menu configura­tion parameters setting procedure, to display a configuration
parameter value

23 ON STAND-BY key ; it permits

• to turn on the instrument

• to turn off the instrument

• to turn out from the configurator and Operator Menu configu­ration parameters setting procedure.

LED

7 set LED; it indicates

• if it flashes, that a working setpoint setting procedure or a
configurator or operator or User Menu configuration param­eter modification procedure is running

8 minutes LED ; it indicates

• if it is turned on, that the unit of measure of the displayed
quantity is the minute

9 hours LED ; it indicates

• if it is turned on, that the unit of measure of the displayed
quantity is the hour

10 bar LED ; it indicates

• if it is turned on, that the unit of measure of the displayed
quantity is the bar or that the displayed quantity is a pressure

11 Celsius degree LED ; it indicates

• if it is turned on, that the unit of measure of the displayed

quantity is the Celsius degree or that the displayed quantity is a
temperature

13 data LED ; it indicates

• if it flashes, that a data transmission in a serial network with
EVCOBUS protocol communication managed by a master (for
instance a Personal Computer) is running

14 alarm LED ; it indicates

• if it flashes, that an alarm is active

15 service LED ; it indicates

• if it is turned on, that an user has exceeded the number of total
working hours enough to signal the request of service

19 compressor/choking valve associated to the output K1 ... 8 LED; it

indicates

• if it is turned on, that the user associated to the output K1 ... 8
is a compressor or a choking valve

• if it flashes, that a count of a disabling time to the compressor
associated to the output K1 ... 8 activation is running

20 condenser fans associated to the output K1 ... 8 LED; it indicates

• if it is turned on, that the user associated to the output K1 ... 8
is a condenser fans

21 power step or condenser fans associated to the output K1 ... 8

status LED; it indicates

• if it is turned on, that the power step associated to the output
K1 ... 8 is loaded or that the condenser fans associated to the
output K1 ... 8 is activated

• if it flashes during an alarm, that the user associated to the
output K1 ... 8 locking digital input is active

22 ON STAND-BY LED; it indicates

• if it is turned on, that the instrument is in the status STAND-BY

26 menu LED; it indicates

• if it is turned on, that a configurator or Operator Menu con­figuration parameters setting procedure is running.

DISPLAYS

12 display; it permits to display

• during an alarm, the alarm code

• the pressure read by the suction probe

• during the users total working hours counter cleaning proce­dure, the user total working hours

• during the manual power steps loading/unloading procedure,
the power step status

• during the working setpoint setting procedure, the working

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setpoint value

• during the configurator, operator and User Menu configura­tion parameters setting procedure a configuration parameter
label

• during the configurator, operator and User Menu configura­tion parameters setting procedure a configuration parameter
value.

INSTRUMENT DESCRIPTION

Displays

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BEFORE THE USE

Settings to execute before the use

SETTINGS TO EXECUTE BEFORE THE USE

To adjust the instrument to the power plant characteristics, it is impor­tant to execute some settings before the use:

a) after supplied the instrument verify if the instrument is in the

status STAND-BY (during the status STAND-BY the display and
the LED are turned off, except the ON STAND-BY LED)

b) if the instrument is in the status ON keep pushed for two

seconds at least the ON STAND-BY key (passed two seconds
the instrument moves to the status STAND-BY)

/b6 and /b7 establish the lower and the upper end of scale for
4-20 mA input of the condensing transducer)

j) if the condensing probe is a PTC probe set the parameter / t

value (the parameter / t establishes the unit of measure with
which the temperature gets displayed)

k) set the parameter r 0 value (the parameter r 0 establishes the

“neutral zone” value of the suction pressure regulator)

l) if a compressor at least is choked set the parameter r C value

(the parameter r C establishes the kind of choking valve that
the instrument must manage)

m) set the parameter F 0 value (the parameter F 0 establishes the

proportional band width of the condenser fans regulator)

n) set the parameter F 1 value (the parameter F 1 establishes the

condensing quantity value to which the instrument activates
the condenser fans)

c) set the working setpoint value (the working setpoint estab-

lishes the suction pressure associated to the compressors; see
the chapter Working setpoint on the page 24)

d) set the parameters tyP1 ... 8 value (the parameters tyP1 ... 8

establish the users to associate to the outputs K1 ... 8)

e) set the parameters Po 1 ... 8 value (the parameters Po 1 ... 8

establish a proportion among the compressors powers)
the parameters tyP1 ... 8 and Po 1 ... 8 belong to the Configurator
Menu; see the chapter Configurator Menu on the page 25

f) set the parameters /A6 and /A7 value (the parameters /A6 and

/A7 establish the lower and the upper end of scale for 4-20 mA

input of the suction transducer)

g) set the parameter /5P value (the parameter /5P establishes

where to display the decimal point)

o) set the parameter F A value (the parameter F A establishes the

condenser fans functioning)
the parameters /A6, /A7, /5P, /bE, /b6, /b7, / t, r 0, r C, F 0, F 1 and
F A belong to the User Menu; see the chapter User Menu on the page

32.

h) set the parameter /bE value (the parameter /bE establishes

the kind of condensing probe that the instrument must recog­nize)

i) if the condensing probe is a 2 wires 4-20 mA pressure trans-

ducer set the parameters /b6 and /b7 value (the parameters

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FUNCTIONING

Preliminary informations - Suction pressure regulation

PRELIMINARY INFORMATIONS

After derived the connections (see the chapter Electrical connection on
the page 51), the instrument reproposes the last setting stored.
Keeping pushed for two seconds at least the ON STAND-BY key the
instrument turning on (status ON) or turning off (status STAND-BY),
except during the setting procedures.

During the status STAND-BY the display and the LED are turned off,
except the ON STAND-BY LED, all relay outputs are forced to the status
OFF, except the output Al1 and the analog output signal is 4 mA or 0 V.

SUCTION PRESSURE REGULATION

Suction pressure regulation happens through the compressors.
The instrument activates the compressors (it loads power steps) with
sequence when the pressure read by the suction probe rises above the
working setpoint of the “neutral zone” value and it deactivates them (it
unloads power steps) in sequence when the pressure read by the
suction probe falls below the working setpoint of the “neutral zone”
value.
The parameter r A establishes the kind of regulating action that the
instrument must manage: it is function of the pressure read by the
suction probe (in this case when the pressure read by the suction probe
is above/below the working setpoint of the “neutral zone” value the
instrument loads/unloads power steps) ...

During the status ON, in the course of the normal functioning the
instrument displays the pressure read by the suction probe.

If an alarm should be active the instrument displays the alarm code
flashing, for instance “EFAn”, the buzzer utters an intermittent beep,
the alarm LED flashes and the output Al1 gets activated (see the para­graph Alarms on the page 46); pressure on the down key during an
alarm permits to silence the buzzer but does not modify the outputs Al1
and Al1 status.

or function of the pressure read by the suction probe and of the direc­tion of the pressure read by the suction probe (the same action saw in
the previous case but when the pressure read by the suction probe is
above/below the working setpoint of the “neutral zone” value and it is
going towards the “neutral zone” the instrument does not load/unload
power steps).

The instrument automatically computes which compressor to activate

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FUNCTIONING

Suction pressure regulation - Compressors protection

or deactivate according with the protections, the powers and the
working hours of the compressors.
Speaking of suction pressure regulation

• the parameter Hr 1 ... 8 permits to display the total working
hours of the user associated to the output K1 ... 8

• the parameter tyP1 ... 8 establishes the user to associate to the
output K1 ... 8

• the parameter Po 1 ... 8 establishes a proportion among the
compressors powers

the parameters Hr 1 ... 8, tyP1 ... 8 and Po 1 ... 8 belong to the
Configurator Menu; see the chapter Configurator Menu on the page
25

• the parameter r 0 establishes the “neutral zone” value

• the parameter r 4 establishes the percentage of “neutral zone”
value to apply below the working setpoint

• the parameter r 8 establishes the minimum time interval that
pass from the moment in which the instrument loads a power
step to the moment in which the instrument loads the follow­ing power step

• the parameter r 9 establishes the minimum time interval that
pass from the moment in which the instrument unloads a power
step to the moment in which the instrument unloads the fol­lowing power step

• the parameter r A establishes the kind of regulating action that
the instrument must manage

• the parameters C 0, C 1 and C 2 permit to set the instrument
to protect the compressors against overloads due to several
starts repeated in a short time (see the paragraph Compres-
sors protection on the page 10)

• the parameter C 6 establishes the number of power steps
loaded during a suction probe failure alarm (see the para­graph Alarms on the page 46)

• the parameter C 7 establishes the number of running working
hours of a power step enough to request the power step
unloading

• the parameter C H establishes the number of total working
hours of a power step enough to signal the request of service
(see the paragraph Alarms on the page 46)

the parameters r 0, r 4, r 8, r 9, r A, C 0, C 1, C 2, C 6, C 7 and C H
belong to the User Menu; see the chapter User Menu on the page 32.
If the compressor is choked the respective choking valve will be associ­ated to the following relay output (for instance if the compressor to
choke is associated to the output K1, the respective choking valve must
be associated to the output K2).
The parameter r C establishes the kind of choking valve that the instru­ment must manage: NC choking valve (in this case the instrument
loads a power step activating at the same time the compressor and the
respective choking valve and it loads another power step deactivating
the choking valve) ...

... or NO choking valve (in this case the instrument loads a power step
activating the compressor and it loads another power step activating
the choking valve).

Speaking of choked compressors

• the parameter r C establishes the kind of choking valve that
the instrument must manage

the parameter r C belongs to the User Menu; see the chapter User
Menu on the page 32.

COMPRESSORS PROTECTION

Some parameters permit to set the instrument to protect the compres­sors against overloads due to several starts repeated in a short time

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Compressors protection - Users total working hours counter cleaning - Manual power steps loading/unloading

Speaking of compressors protection

• the parameter C 0 establishes the time that disables the com­pressor activation from the moment in which the instrument
gets supplied

• the parameter C 1 establishes the time that disables the com­pressor activation from the moment of the previous compres­sor activation

• the parameter C 2 establishes the time that disables the com­pressor activation from the moment of the previous compres­sor deactivation

the parameters C 0, C 1 and C 2 belong to the User Menu; see the
chapter User Menu on the page 32.

USERS TOTAL WORKING HOURS COUNTER CLEANING

To gain access to the users total working hours counter cleaning pro­cedure:

a) gain access to the second level of the configurator or Opera-

tor Menu (see the chapter Configurator Menu on the page 25
or the chapter Operator Menu on the page 29)

b) push and release over and over the up or the down key as

long as the instrument displays the label of the desired user (for
instance to clear the counter of the total working hours of the
user associated to the output K2 select the label Hr 2)

FUNCTIONING

e) after the modification push and release the set key (to the

release of the set key the instrument displays the label Hr 2
again).

To turn out from the users total working hours counter cleaning proce­dure:

f) repeat the passage n or n’ of the chapter Configurator Menu

on the page 25.

MANUAL POWER STEPS LOADING/UNLOADING

To gain access to the manual power steps loading/unloading proce­dure:

a) gain access to the second level of the Operator Menu (see the

chapter Operator Menu on the page 29)

c) push and release the set key (to the release of the set key the

instrument displays the actual value, for instance 7 and the set
LED flashes to indicate that a configuration parameter modifi­cation procedure is running; passed four seconds without op­erated with the keys the instrument automatically turns out
from the configuration parameter modification procedure).

To clear the counter:

d) keep pushed for four seconds at least the down key (passed

four seconds the instrument displays 0)

b) push and release over and over the up or the down key as

long as the instrument displays the label of the desired power
step (for instance to load/unload the power step associated to
the output K2 select the label St 2)

c) push and release the set key (to the release of the set key the

instrument displays the actual status, for instance OFF and the
set LED flashes to indicate that a configuration parameter
modification procedure is running; passed four seconds with­out operated with the keys the instrument automatically turns
out from the configuration parameter modification procedure).

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FUNCTIONING

Manual power steps loading/unloading - Condensing quantity regulation

To load/unload manually the power step:

d) if the actual status of the power step is OFF keep pushed for

four seconds at least the up key (passed four seconds the
instrument displays On, the new status of the power step) ...

condenser fans, for instance 4, it activates the condenser fans with
sequence every time the quantity read by the condensing probe rises
above the condenser fans activation setpoint of a fraction of propor­tional band and it deactivates them with sequence when the quantity
read by the condensing probe falls below the value to which the
activation happened of a fraction of proportional band) ...

d’) ... if the actual status of the power step is ON keep pushed for

four seconds at least the down key (passed four seconds the
instrument displays OFF, the new status of the power step)

e) after the modification push and release the set key (to the

release of the set key the instrument displays the label St 2
again).

To turn out from the manual power steps loading/unloading proce­dure:

f) repeat the passage n or n’ of the chapter Configurator Menu

on the page 25.

Additional informations

• the manual unloading of the power step of a choked compres­sor gives the unloading of the power step of the respective
choking valve.

CONDENSING QUANTITY REGULATION

Condensing quantity regulation happens through the condenser fans.
The parameter F A establishes the condenser fans functioning: it is
function of the quantity read by the condensing probe (in this case the
instrument automatically divides the proportional band in equal frac­tions according with the number of relay outputs associated to the

... or function of the power steps loading/unloading (in this case a
power step loading/unloading gives the automatic activation/deacti­vation of a condenser fans).

The parameter F d establishes the method used by the instrument to
compute which condenser fans to activate or deactivate: with fixed
sequence (in this case if the users associated to the outputs K5, K6, K7
and K8 are condenser fans, the instrument activates them beginning
from that associated to the output K5 and it deactivates them with the
reversal method) or balancing the total working hours (in this case the
instrument activates the condenser fans with sequence beginning from
that with the lower number of total working hours and it deactivates
them with the reversal method).
Speaking of condensing quantity regulation

• the parameter Hr 1 ... 8 permits to display the total working

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FUNCTIONING

Condensing quantity regulation - Analog output - Digital inputs

hours of the user associated to the output K1 ... 8

• the parameter tyP1 ... 8 establishes the user to associate to the
output K1 ... 8

the parameters Hr 1 ... 8 and tyP1 ... 8 belong to the Configurator
Menu; see the chapter Configurator Menu on the page 25

• the parameter Pb F permits to display the quantity read by the
condensing probe

the parameter Pb F belongs to the Operator Menu; see the chapter
Operator Menu on the page 29

• the parameter / t establishes the unit of measure with which
the temperature gets displayed

• the parameter /bE establishes the kind of condensing probe
that the instrument must recognize

• the parameter F 0 establishes the proportional band width

• the parameter F 1 establishes the condensing quantity value
to which the instrument activates the condenser fans

• the parameter F A establishes the condenser fans functioning

• the parameter F d establishes the method used by the instru­ment to compute which condenser fans activate/deactivate

• the parameter F H establishes the number the total working
hours of a condenser fans enough to signal the request of
service (see the paragraph Alarms on the page 46)

the parameters / t, /bE, F 0, F 1, F A, F d and F H belong to the User
Menu; see the chapter User Menu on the page 32.

ANALOG OUTPUT

The 4-20 mA or 0-10 V analog output is associated to the condenser
fans.
The parameter F A establishes the condenser fans functioning and
then the analog output functioning: it is function of the quantity read by
the condensing probe (in this case the analog output signal is propor­tional to the error between the condenser fans activation setpoint and
the quantity read by the condensing probe in every point of the pro­portional band) ...

... or function of the power steps loading/unloading (in this case the

analog output signal is proportional to the number of condenser fans
activated on the number of relay outputs associated to the condenser
fans, for instance 4).

Speaking of analog output

• the parameter outF permits to display the percentage of the
analog output signal

the parameter outF belongs to the Operator Menu; see the chapter
Operator Menu on the page 29

• the parameter F 0 establishes the proportional band width

• the parameter F 1 establishes the condensing quantity value
to which the instrument activates the condenser fans

• the parameter F A establishes the condenser fans functioning

the parameters F 0, F 1 and F A belong to the use Menu; see the
chapter User Menu on the page 32.

DIGITAL INPUTS

The instrument is provided with twelve digital inputs configurable to
interact on the relay outputs activity.
Activating the user associated to the output K1 ... 8 locking digital input
the instrument activates the user associated to the output K1 ... 8
locking digital input alarm (see the paragraph Alarms on the page 46).
Activating the freon level digital input the instrument activates the freon
level digital input alarm (see the paragraph Alarms on the page 46).
Activating the condenser fans safety digital input the instrument acti­vates the condenser fans safety digital input alarm (see the paragraph
Alarms on the page 46).
Activating the upper condensing quantity digital input the instrument
activates the upper condensing quantity digital input alarm (see the
paragraph Alarms on the page 46) and it increases an upper condens­ing quantity alarms counter as long as the number of upper condens­ing quantity alarms enough to give the instrument locking gets reached
(the increasing of the upper condensing quantity alarms counter gets
given also by the upper condensing quantity alarm activation; see the
paragraph Upper condensing quantity alarm on the page 15); to
unlock the instrument turn off and turn on again the instrument.

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FUNCTIONING

Digital inputs - Lower pressure alarm

Activating the lower pressure digital input the instrument activates the
lower pressure digital input alarm (see the paragraph Alarms on the
page 46) and it increases a lower pressure alarms counter as long as
the number of lower pressure alarms enough to give the instrument
locking gets reached (the increasing of the lower pressure alarms
counter gets given also by the lower pressure alarm activation; see the
paragraph Lower pressure alarm on the page 14); to unlock the
instrument turn off and turn on again the instrument.
Speaking of digital inputs

• the parameter i1P establishes the kind of contact of the user
compressor associated to the output K1 ... 8 locking digital
inputs

• the parameter i2P establishes the kind of contact of the user
condenser fans associated to the output K1 ... 8 locking digital
inputs

• the parameter i5P establishes the kind of contact of the freon
level digital input

• the parameter i6P establishes the kind of contact of the con­denser fans safety digital input

• the parameter i7P establishes the kind of contact of the upper
condensing quantity digital input

• the parameter i8P establishes the kind of contact of the lower
pressure digital input

• the parameter AAn establishes the number of lower pressure
alarms enough to give the instrument locking

• the parameter ACn establishes the number of upper condens­ing quantity alarms enough to give the instrument locking

• the parameter A 6 establishes the time that must pass from the
moment of a previous alarms counter increasing in order that
the counter get cleared

the parameter i1P, i2P, i5P, i6P, i7P, i8P, AAn, ACn and A 6 belong to the
User Menu; see the chapter User Menu on the page 32.

... or lower pressure alarm relative to the working setpoint (in this case
the instrument activates the lower pressure alarm when the pressure
read by the suction probe falls below the working setpoint of the alarm
setpoint value).

LOWER PRESSURE ALARM

When the pressure read by the suction probe falls below the alarm
setpoint the instrument activates the lower pressure alarm (see the
paragraph Alarms on the page 46) and it increases a lower pressure
alarms counter as long as the number of lower pressure alarms enough
to give the instrument locking gets reached (the increasing of the
lower pressure alarms counter gets given also by the lower pressure
digital input activation; see the paragraph Digital inputs on the page

13); to unlock the instrument turn off and turn on again the instrument.
The parameter AA4 establishes the kind of lower pressure alarm that
the instrument must manage: the lower pressure alarm never gets
activated, absolute lower pressure alarm (in this case the instrument
activates the lower pressure alarm when the pressure read by the
suction probe falls below the alarm setpoint) ...

Speaking of lower pressure alarm

• the parameter i8P establishes the kind of contact of the lower

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FUNCTIONING

Lower pressure alarm - Upper pressure alarm - Upper condensing quantity alarm

pressure digital input

• the parameter AA0 establishes the hysteresis (differential) rela­tive to the alarm setpoint

• the parameter AA1 establishes the alarm setpoint value

• the parameter AA4 establishes the kind of lower pressure alarm
that the instrument must manage

• the parameter AA7 establishes the time that disables a lower
pressure alarm activation from the moment in which the lower
pressure alarm happens

• the parameter AAn establishes the number of lower pressure
alarms enough to give the instrument locking

• the parameter A 6 establishes the time that must pass from the
moment of a previous alarms counter increasing in order that
the counter get cleared

the parameters i8P, AA0, AA1, AA4, AA7, AAn and A 6 belong to the
User Menu; see the chapter User Menu on the page 32.

UPPER PRESSURE ALARM

When the pressure read by the suction probe rises above the alarm
setpoint the instrument activates the upper pressure alarm (see the
paragraph Alarms on the page 46) and it increases an upper pressure
alarms counter as long as the number of upper pressure alarms enough
to give the instrument locking gets reached; to unlock the instrument
turn off and turn on again the instrument.
The parameter Ab4 establishes the kind of upper pressure alarm that
the instrument must manage: the upper pressure alarm never gets
activated, absolute upper pressure alarm (in this case the instrument
activates the upper pressure alarm when the pressure read by the
suction probe rises above the alarm setpoint) ...

... or upper pressure alarm relative to the working setpoint (in this case
the instrument activates the upper pressure alarm when the pressure
read by the suction probe rises above the working setpoint of the
alarm setpoint value).

Speaking of upper pressure alarms

• the parameter Ab0 establishes the hysteresis (differential) rela­tive to the alarm setpoint

• the parameter Ab1 establishes the alarm setpoint value

• the parameter Ab4 establishes the upper pressure alarm that
the instrument must manage

• the parameter Ab7 establishes the time that disables an upper
pressure alarm activation from the moment in which the up­per pressure alarm happens

• the parameter Abn establishes the number of upper pressure
alarms enough to give the instrument locking

• the parameter A 3 establishes the time that disables an upper
pressure alarm activation from the moment of the instrument
start

• the parameter A 6 establishes the time that must pass from the
moment of a previous alarms counter increasing in order that
the counter get cleared

the parameters Ab0, Ab1, Ab4, Ab7, Abn, A 3 and A 6 belong to the
User Menu; see the chapter User Menu on the page 32.

UPPER CONDENSING QUANTITY ALARM

When the quantity read by the condensing probe rises above the
alarm setpoint the instrument activates the upper condensing quantity
alarm (see the paragraph Alarms on the page 46) and it increases an

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FUNCTIONING

Upper condensing quantity alarm

upper condensing quantity alarms counter as long as the number of
upper condensing quantity alarms enough to give the instrument lock­ing gets reached (the increasing of the upper condensing quantity
alarms counter gets given also by the upper condensing quantity dig­ital input activation; see the paragraph Digital inputs on the page 13);
to unlock the instrument turn off and turn on again the instrument.
The parameter AC4 establishes the kind of upper condensing quantity
alarm that the instrument must manage: the upper condensing quan­tity alarm never gets activated, absolute upper condensing quantity
alarm (in this case the instrument activates the upper condensing quan­tity alarm when the quantity read by the condensing probe rises above
the alarm setpoint) ...

... or upper condensing quantity alarm relative to the setpoint estab­lished with the parameter F 1 (in this case the instrument activates the
upper condensing quantity alarm when the quantity read by the con­densing probe rises above the condenser fans activation setpoint of the
alarm setpoint value).

Speaking of upper condensing quantity alarm

• the parameter i7P establishes the kind of contact of the upper
condensing quantity digital input

• the parameter AC0 establishes the hysteresis (differential) rela­tive to the alarm setpoint

• the parameter AC1 establishes the alarm setpoint value

• the parameter AC4 establishes the kind of upper condensing
quantity alarm that the instrument must manage

• the parameter AC7 establishes the time that disables an upper
condensing quantity alarm activation from the moment in which
the upper condensing quantity alarm happens

• the parameter ACn establishes the number of upper condens­ing quantity alarms enough to give the instrument locking

• the parameter A 6 establishes the time that must pass from the
moment of a previous alarms counter increasing in order that
the counter get cleared

the parameters i7P, AC0, AC1, AC4, AC7, ACn and A 6 belong to the
User Menu; see the chapter User Menu on the page 32.

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FUNCTIONING

Notes

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