dIXEL XB570L Manual de instruções e de funcionamento - Página 3

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rS2 (-50÷50°C; 1°C/1°F) Room probe Set point for the second phase: it

prevents temperature from reaching a too low value during the second

phase.

Pd2 OFF÷4.0h; res. 10 min

iS3 (-50÷50°C; 1°C/1°F) Insert Probe Set point to stop the third (and last)

phase: when the temperature measured by the third probe reaches this

value the whole cycle is ended.

rS3 (-50÷50°C; 1°C/1°F) Room probe Set point for the third (and last) phase:

it prevents temperature from reaching a too low value during the third

(and last) phase.

Pd3 (OFF÷4.0h; 10 min) Maximum time for the third phase.

dbH (yes / no) defrost before the hold phase

HdS (-50÷50 - OFF; 1 °C / 1°F) Set point of the holding phase. With "OFF"

the hold phase is disabled.

IMPORTANT NOTE: If the duration time of a phase is set at the OFF value,

the corresponding phase is disabled. E.g. If Pd3= 0FF the third phase of the

cycle is not active.

14.2 . HOW TO USE THE INSERT PROBE.

By means the insert probe, the internal temperature of products can be

checked. This measure is used to end the various phase of the cycle. A

special internal function detect if the inset probe is not used, in this case the

cycle is made by time

14.3 EXAMPLE OF A BLAST CHILLER CYCLE.

The following drawing explains how a Blast Chiller cycle can be done.

14.3.1 First phase: "Hard chill".

It is normally used to fast chill hot foods. E.g. from 80°C / 170°F to 20°C /

70°F

During "Hard Chill", both compressor and fan are always on until the

rS1 temperature is reached. At this point compressor is turned on end

off so as to keep the temperature of the room at the rS1 value. "Hard

Chill" ends when the temperature measured by the third probe reaches

the iS1 value. Normally rS1 is set at few degrees below zero.

14.3.2 Second phase: "Soft chill".

The Soft Chill starts when the Hard Chill ends. It is used to prevent thin

layer of ice from forming on the product. The Soft Chill lasts until the

temperature measured by the third probe reaches the set point iS2

(usually 4 or 5°C).

During Soft Chill the temperature of the room is regulated by the ambient

probe with the set point rS2 (normally at 0 or 1 °C / 32 or 34°F). When

the box temperature reaches the rS2 value compressor is turned on end

off so as to keep the temperature of the box at this value.

14.3.3 Third phase: "Freezing cycle".

Freezing Cycle: used to fast freeze foods.

The Freezing Cycle starts when the Soft Chill ends. During the "Freezing

Cycle" both compressor and fan are always on until the rS3 temperature

is reached. At this point compressor and fans are turned on end off so as

to keep the temperature of the room at the rS3 value (normally some

degrees below iS3). Freezing Cycle ends when the temperature

measured by the third probe reaches the iS3 value (normally -18°C /

0°F), in any case it ends when the maximum time Pd1 + Pd2 + Pd3 has

expired.

14.3.4 End of the Blast Chill cycle and starting of the Hold Mode.

When the Blast Chiller cycle ends an alarm signal is generated: buzzer

and alarm relay is turned ON, the display shows the message "End"

alternating with the room temperature.

1592006100 XB570L GB r1.0 04.11.2004.doc

Operating and Instructions Manual

Maximum time for second phase.

The alarm automatically stops after 30min or by pressing any key.

At the end of the Blast Chiller cycle the controller can start the "Hold

mode" keeping the room temperature at the value set in HdS parameter.

If HdS = OFF, the machine is turned OFF.

NOTE1: with dbH = yES a defrost is done before the holding phase.

NOTE2: If the end cycle temperature IS3 is not reached by the maximum

time Pd1+Pd2+Pd3 the instrument keep on working, but the alarm message

"OCF" is given.

15. Function And Parameter Programming Menu

15.1 FUNCTION MENU

Includes all the main functions controlled by the instrument.

15.2 ACCESS PROCEDURE:

Hold the SET and DOWN keys pressed for few seconds, until the label of

the first function will be displayed.

The UP and DOWN keys are used to cycle backwards or forward in the

menu.

By pressing the SET key the currently displayed function is enabled.

To go back to the previously Menu press the SET and DOWN keys

together

15.3 LIST OF FUNCTIONS

15.3.1 "Prb": probe display

It permits the user to display the temperatures measured by the probes.

•

rPr: displays for 10s the temperature measured by the room probe.

•

EPr: displays for 10s the temperature measured by the evaporator

probe.

•

iPr: displays for 10s the temperature measured by the insert probe.

NOTE1 If a key is pressed when a temperature is displayed, the

instrument go back to show the label of the probe (rPr, EPr, iPr).

NOTE2: If the selected probe is broken, the follow alarm labels will be

displayed: rPF for the room probe, EPF for the evaporator probe, iPF for

the insert probe.

15.3.2 "Pr1": user parameters

"Pr1" includes all user accessible parameters. If no parameter would be

present in the menu, the label "Pr2" will be displayed.

15.3.3 "Pr2": installer parameters

"Pr2": includes all the instrument's parameters (at installer level). It can be

accessed through a security code. Hence it is possible to modify all

parameters and add or remove parameters from "Pr1" (user level) by

pressing "SET" + "UP". When a parameter is enabled at user level,

LED

(Alarm LED) is on.

15.3.4 "FCy": cycle management

The FCy menu contains the Cy1, Cy2, Cy3, Cy4 submenu. Each

submenu contains all the configurable parameter of the cycle as shown

in the following drawing:

Fcy

Cy1

Cy2

dbC

iS1

rS1

Pd1

iS2

rS2

Pd2

iS3

rS3

Pd3

dbH

HdS

15.3.5 "Sto": cycle length

The Sto menu records the real length of a cycle and the real length of

each single phase. It contains the following sub-menu:

tCy: cycle duration, tP1: first phase duration; tP2: second phase

duration; tP3: third phase duration.

XB570L

1592006100

Cy3

Cy4

dbC

iS1

rS1

Pd1

iS2

rS2

Pd2

iS3

rS3

Pd3

dbH

HdS

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