dixell XR20C Installing And Operating Instructions

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Alarm duration

Safe food zone

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Digital controller with off cycle defrost

XR20C

CONTENTS

1. GENERAL WARNING___________________________________________ 1

2. GENERAL DESCRIPTION _______________________________________ 1

3. CONTROLLING LOADS _________________________________________ 1

4. FRONT PANEL COMMANDS_____________________________________ 1

5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP)___ 1

6. MAIN FUNCTIONS _____________________________________________ 1

7. PARAMETERS ________________________________________________ 2

8. DIGITAL INPUT________________________________________________ 2

9. INSTALLATION AND MOUNTING _________________________________ 3

10. ELECTRICAL CONNECTIONS ___________________________________ 3

11. HOW TO USE THE HOT KEY ____________________________________ 3

12. ALARM SIGNALS ______________________________________________ 3

13. TECHNICAL DATA _____________________________________________ 3

14. CONNECTIONS _______________________________________________ 3

15. DEFAULT SETTING VALUES ____________________________________ 4

1. GENERAL WARNING

1.1 PLEASE READ BEFORE USING THIS MANUAL

• This manual is part of the product and should be kept near the instrument for easy and quick reference.

• The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a safety device.

• Check the application limits before proceeding.

1.2

• Check the supply voltage is correct before connecting the instrument.

• Do not expose to water or moisture: use the controller only within the operating

• Warning: disconnect all electrical connections before any kind of maintenance.

• Fit the probe where it is not accessible by the End User. The instrument must

• In case of failure or faulty operation send the instrument back to the distributor

• Consider the maximum current which can be applied to each relay (see

• Ensure that the wires for probes, loads and the power supply are separated

• In case of applications in industrial environments, the use of mains filters (our

2. GENERAL DESCRIPTION

Model designed for refrigeration applications at normal temperature. It provides a relay output to drive the compressor and a PTC or NTC probe input. A internal ti mer manages the off cycle defrost. The instrument is fully configurable through special parameters that can be easily programmed through the keyboard.

3. CONTROLLING LOADS

3.1 COMPRESSOR

The regulation is performed according to the temperature measured by the thermostat probe with a positive differential from the set point: if the temperature increases and reaches set point plus differential the compressor is started and then turned off when the temperature reaches the set point value again.

SAFETY PRECAUTIONS

limits avoiding sudden temperature changes with high atmospheric humidity to prevent formation of condensation

not be opened. or to “Dixell s.r.l.” (see address) with a detailed description of the fault. Technical Data). and far enough from each other, without crossing or intertwining. mod. FT1) in parallel with inductive loads could be useful.

, format 32 x 74 mm, is a digital termostat with off cycle defrost

XR20C

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: To display target set point; in programming mode it selects a parameter or

SET

confirm an operation.

To start a manual defrost

(DEF)

(UP): To see the last temperature alarm happened; in programming mode it

browses the parameter codes or increases the displayed value.

(DOWN) To see the last temperature alarm happened; in programming mode it

browses the parameter codes or decreases the displayed value.

KEY COMBINATIONS:

SET + SET +

4.1 USE OF LEDS

Each LED function is described in the following table.

LED MODE FUNCTION

5. TEMPERATURE ALARM AND ITS DURATION RECORDING (HACCP)

XR20C signals and records temperature alarms, together with their duration and max value reached. See drawing:

Ex. High temperature alarm

5.1 HOW TO SEE THE ALARM DURATION AND MAX (MIN) TEMPERATURE

If the alarm LED is on, an alarm has taken place. To see the kind of alarm, the max (min) reached temperature and alarm duration do as follows:

1. Push the Up or Down key.

2. On the display the following message is shown::

3. Then the instrument displays the temperature once again.

NOTE1: NOTE2:

5.2 HOW TO RESET A RECORDED ALARM OR ONE THAT IS STILL OCCURRING

1. Hold the SET key pressed for more than 3s, while the recorded alarm is

2. To confirm the operation, the “rSt” message starts blinking and the normal

6. MAIN FUNCTIONS

To lock & unlock the keyboard.

To enter in programming mode.

& '

To return to the room temperature display.

ON Compressor enabled Flashing

-Programming Phase (flashing with

- Anti-short cycle delay enabled

ON Defrost enabled Flashing

- Programming Phase (flashing with

ON An temperature alarm happened

Tem pe ratu re

Max

Temperature

ALu

High temp. alarm

Set

ALL

Low temp. alarm

“

” for high temperature alarm (“

HAL

the

Maximum (minimum) temperature.

Then the “ h.mm.

if an alarm is still occurring the “

the alarm is recorded when the temperature come back to normal values

displayed. (the rSt message will be displayed) temperature will be displayed.

tiM

” (

tiM

;

LAL

e) message is displayed, followed by the

” shows the partial duration.

tim

)

;

Time

” fot the minimum allarm), foll owed by

“Duration”

In case of fault in the thermostat probe the start and stop of the compressor are timed through parameters “

COn

” and “

COF

”.

3.2 DEFROST

Defrost is performed through a simple stop of the compressor. Parameter “ controls the interval between defrost cycles, while its length is controlled by parameter “

MdF

”.

4. FRONT PANEL COMMANDS

IdF

6.1 HOW TO SEE THE SET POINT

1. Push and immedi ately release the show the Set point value;

2. Push and im mediately release the

”

probe value again.

key or wait for 5 seconds to display the

SET

key: the display will

SET

6.2 HOW TO CHANGE THE SETPOINT

1. Push the

2. The value of the set point will be displayed and the

3. To change the Set value push the

4. To memorise the new set point value push the

key for more than 2 seconds to change the Set point value;

SET

arrows within 10s.

LED starts blinking;

key again or wait 10s.

SET

6.3 HOW TO START A MANUAL DEFROST

Push the defrost will start.

key for more than 2 seconds and a manual

DEF

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6.4 HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

5. Press “

To exit: Press SET + UP or wait 15s without pressing a key. NOTE: the set value is stored even when the procedure is exited by waiting the

time-out to expire.

1. Enter the Programming mode by pressing the Set and DOWN key for 3s (

2. Select the required parameter.

3. Press the “SET” key to display its value (now only the LED is blinking).

4. Use “UP” or “DOWN” to change its value.

” to store the new value and move to the following parameter.

SET

and

start blinking).

6.5 THE HIDDEN MENU

The hidden menu Includes all the parameters of the instrument.

6.5.1 HOW TO ENTER THE HIDDEN MENU

3. Select the required parameter.

4. Press the “

5. Use

6. Press “SET” to store the new value and move to the following parameter. To exit: Press SET + NOTE: the set value is stored even when the procedure is exited by waiting the

time-out to expire.

6.5.2 HOW TO MOVE A PARAMETER FROM THE HIDDEN MENU TO THE FIRST LEVEL AND VICEVERSA.

Each parameter present in the HIDDEN MENU can be removed or put into “THE FIRST LEVEL” (user level) by pressing “SET + In HIDDEN MENU when a parameter is present in First Level the decimal point is on.

1. Enter the Programming mode by pressing the Set +

for 3s (LED 1 and

2. When a param eter is displayed keep pressed the Set+

for more than 7s. The Pr2 label will be displayed immediately followed from the HY parameter.

NOW YOU ARE IN THE HIDDEN MENU.

” key to display its value (Now only the

SET

to change its value.

or wait 15s without pressing a key.

start blinking).

”.

LED is blinking).

6.6 HOW TO LOCK THE KEYBOARD

Keep pressed for more than 3 s the

The “POF” message will be displayed and the keyboard will be locked. At this point it will be possible only to see the set point or the MAX o Min temperature stored

If a key is pressed more than 3s the “POF” message will be displayed.

and

keys.

6.7 TO UNLOCK THE KEY BOARD

Keep pressed together for more than 3s the will be displayed.

and

keys, till the

6.8 THE CONTINUOUS CYCLE

When defrost is not in progress, it can be activated by holding the “

''” key pressed for about 3 seconds.

The compressor operates in continuous mode for the time set through the “CCt” parameter. The cycle can be terminated before the end of the set time using the same activation key “

''” for 3 seconds.

7. PARAMETERS

NOTE: the parameters preceded by dots are in the Hidden Menu. REGULATION Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point.

Compressor Cut IN is Set Point Plus Differential (Hy). Compressor Cut OUT is when the temperature reaches the set point.

LS Minimum set point: (- 50°C÷SET/-58°F÷SET): Sets the minimum

•

acceptable value for the set point.

•

US Maximum set point: (SET÷110°C/ SET÷230°F). Set the maximum acceptable value for set point.

Ot Thermostat probe calibration

-120÷120°F) allows to adjust possible offset of the thermostat probe.

OdS Outputs activation delay at start up: (0÷255min) This function is

•

enabled at the initial start up of the instrument and inhibits any output activation for the period of time set in the parameter.

AC Anti-short cycle delay: (0÷50 min) minimum interval between the compressor

stop and the following restart.

CCt Compressor ON time during continuous cycle: (0.0÷24.0h; res. 10min)

•

Allows to set the length of the continuous cycle: compressor stays on without interruption for the CCt time. Can be used, for instance, when the room is filled with new products.

•

COn Compressor ON time with faulty probe: (0÷255 min) time during which the compressor is active in case of faulty thermostat probe. With COn=0 compressor is always OFF.

•

COF Compressor OFF time with faulty probe: (0÷255 min) time during which the compressor is OFF in case of faulty thermostat probe. With COF=0

compressor is always active.

CH Type of action: CL = cooling; Ht = heating.

: (-12.0÷12.0°C;

“Pon”

key

message

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DISPLAY

•

CF Temperature measurement unit:

°C=Celsius; °F=Fahrenheit. WARNING: When the measurement unit is

changed the SET point and the values of the parameters Hy, LS, US, Ot, ALU and ALL have to be checked and modified if necessary).

rES Resolution (for °C): (in = 1°C; dE = 0.1 °C) allows decimal point display. DEFROST IdF Interval between defrost cycles: (0÷120h) Determines the time interval

between the beginning of two defrost cycles.

MdF (Maximum) length for defrost: (0÷255min) W hen P2P = n, (not evaporator

probe: timed defrost) it sets the defrost duration, when P2P = y (defrost end based on temperature) it sets the maximum length for defrost.

dFd Temperature displayed during defrost: (rt = real temperature; it =

•

temperature at defrost start; SEt = set point; dEF = “dEF” label)

•

dAd MAX display delay after defr ost: (0÷255min). Sets the maximum time between the end of defrost and the restarting of the real room temperature display.

ALARMS

•

ALC Temperature alarms configuration: (Ab; rE) Ab= absolute temperature: alarm temperature is given by the ALL or ALU

values. rE = temperature alarms are referred to the set point. Temperature alarm is enabled when the temperature exceeds the “SET+ALU” or “SET-ALL” values.

ALU MAXIMUM temperatur e alarm: (SET÷110°C; SET÷230°F) when this

temperature is reached the alarm is enabled, after the “ALd” delay time.

ALL Minimum temperature alarm: (-50.0 ÷ SET°C;

-58÷230°F when this temperature is reached the alarm is enabled, after the “ALd” delay time.

ALd Temperature alarm delay: (0÷255 min) time interval between the

•

detection of an alarm condition and alarm signalling.

•

dAO Exclusion of temperature alarm at startup: (from 0.0 min to 23.5h) time interval between the detection of the temperature alarm condition after instrument power on and alarm signalling.

DIGITAL INPUT i1P Digital input polarity: oP: the digital input is activated by opening the contact;

CL: the digital input is activated by closing the contact.

i1F Digital input configuration:

EAL = external alarm: “EA ” message is displayed; bAL = serious alarm “CA”

message is displayed. PAL = pressure switch alarm, “CA” message is displayed; dor = door switch function; dEF = activation of a defrost cycle; LHt =not enabled; Htr = kind of action inversion (cooling – heating).

did:(0÷255 min)

with i1F= EAL or i1F = bAL digital input alarm delay: delay between the

detection of the external alarm condition and its signalling.

with i1F= dor: door open signalling delay with i1F = PAL: time for pressure switch function: time interval to calculate

the number of the pressure switch activation.

nPS Pressure switch number: (0

switch, during the “did” interval, before signalling the alarm event (I2F= PAL).

If the nPS activation in the did time is reached, switch off and on the instrument to restart normal regulation.

odc Compressor status when open door: no, Fan = normal; CPr, F_C =

•

Compressor OFF

OTHER PbC Type of probe: it allows to set the kind of probe used by the instrument: PbC

= PBC probe, ntC = NTC probe.

•

rEL Software release for internal use.

•

Ptb Parameter table code: readable only.

8. DIGITAL INPUT

The free contact digital input is programmable in five different configurations by the “i1F” parameter.

8.1 DOOR SWITCH INPUT (i1F = dor)

It signals the door status and the corresponding relay output status through the “odc” parameter:

no, Fan = normal (any change); CPr, F_C = Compressor OFF;

Since the door is opened, after the delay time set through parameter “ did”, the door alarm is enabled, the display shows the message “dA” and The alarm stops as soon as the external digital input is disabled again. With the door open, the high and low temperature alarms are disabled.

8.2 GENERIC ALARM (i1F = EAL)

As soon as the digital input is activated the unit will wait for “did” time delay before signalling the “EAL” alarm message. The outputs status don’t change. The alarm stops just after the digital input is de-activated.

8.3 SERIOUS ALARM MODE (i1F = bAL)

When the digital input is activated, the unit will wait for “did” delay before signalling the “CA” alarm message. The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-activated.

8.4 PRESSURE SWITCH (i1F = PAL)

If during the interval time set by “did” parameter, the pressure switch has reached the number of activation of the “ will be displayed. The compressor and the regulation are stopped. W hen the digital input is ON the compressor is always OFF.

15) Number of activation of the pressure

the regulation restarts

” parameter, the “CA” pressure alarm message

nPS

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N.C.

If the nPS activation in the did time is reached, switch off and on the instrument to restart normal regulation.

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8.5 START DEFROST (i 1F = dFr)

It starts a defrost if there are the right conditions. After the defrost is finished, the normal regulation will restart only if the digital input is disabled otherwise the instrument will wait until the “MdF” safety time is expired.

8.6 INVERSION OF THE KI ND OF ACTION: HEATINGCOOLING (i1F = Htr)

This function allows to invert the regulation of the controller: from cooling to heating and viceversa.

8.7 DIGITAL INPUTS POLARITY

The digital input polarity depends on the “i1P” parameter. i1P=CL: the input is activated by closing the contact. i1P=OP: the input is activated by opening the contact

9. INSTALLATION AND MOUNTING

Instrument XR20C shall be mounted on vertical panel, in a 29x71 mm hole, and fixed using the special bracket supplied. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-C) as shown in figure.

The temperature range allowed for correct operation is 0÷60 °C. Avoid places subject to strong vibrations, corrosive gases, excessive dirt or humidity. The same recommendations apply to probes. Let air circulate by the cooling holes.

10. ELECTRICAL CONNECTIONS

The instrument is provided with screw terminal block to connect cables with a cross section up to 2,5 mm complies with the instrument’s requirements. Separate the probe cables from the power supply cables, from the outputs and the power connections. Do not exceed the maximum current allowed on each relay, in case of heavier loads use a suitable external relay.

. Before connecting cables make sure the power supply

10.1 PROBE CONNECTION

The probes shall be mounted with the bulb upwards to prevent dam ages due to casual liquid infiltration. It is recommended to place the thermostat probe away from air streams to correctly measure the average room temperature. Place the defrost termination probe among the evaporator fins in the coldest place, where most ice is formed, far from heaters or from the warmest place during defrost, to prevent premature defrost termination.

11. HOW TO USE THE HOT KEY

11.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)

1. Program one controller with the front keypad.

2. W hen the controller is ON, insert the “ message appears followed a by flashing

3. Push “

4. Turn OFF the instrument remove the

: the “

NOTE

again

'' key if you want to restart the upload again or remove the “

the operation.

key and the

SET”

” message is displayed for failed programming. In this case push

Err

will stop flashing.

End

Hot key

“End”

“Hot Key”,

” and push

then turn it ON again.

11.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY

(DOWNLOAD)

1. Turn OFF the instrument.

2. Insert a

3. Automatically the parameter list of the

4. After 10 seconds the instrument will restart working with the new parameters.

5. Remove the

NOTE

unit off and then on if you want to restart the download again or remove the “

” to abort the operation.

key

programmed “Hot Key” into the 5 PIN receptacle

the Controller ON. Controller memory, the “

“End”.

“Hot Key”.

the message “

” is displayed for failed programming. In this case turn the

Err

” message is blinking followed a by flashing

doL

“Hot Key”

is downloaded into the

'' key; the

” to abort

Hot key

and then turn

"uPL"

Hot

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12. ALARM SIGNALS

Message Cause Outputs

“P1” Room probe failure Compressor output according “HA” Maximum temperature alarm Outputs unchanged.

“LA” Minimum temperature alarm Outputs unchanged. “dA” Door open Regulation restarts “EA” External alarm Output unchanged. “CA” Serious external alarm (i1F=bAL) All outputs OFF. “CA” Pressure switch alarm (i1F=PAL) All outputs OFF

12.1 ALARM RECOVERY

Probe alarm “P1” starts some seconds after the fault in the related probe; it automatically stops some seconds after the probe restarts normal operation. Check connections before replacing the probe. Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to normal values and when defrost starts. Alarms disabled. Alarm “

and

“EA”

(with i1F=PAL) recovers only by

CA”

(with i1F=bAL) recover as soon as the digital input is

“CA”

13. TECHNICAL DATA

Housing: Case: XR20C Mounting: XR20C Protection: Frontal protection: Connections: Power supply:

±10%, 50/60Hz, 110Vac ±10%, 50/60Hz

Power absorption: Display Inputs Digital input Relay outputs

Data storing Kind of action: Operating temperature: Storage temperature: Relative humidity: Measuring and regulation range:

Resolution: Accuracy (ambient temp. 25°C)

self extinguishing ABS.

frontal 32x74 mm; depth 60mm;

panel mounting in a 71x29mm panel cut-out

IP20.

IP65 with frontal gasket RG-C (optional).

Screw terminal block ≤ 2,5 mm

according to the model: 12Vac/dc, ±10%; 24Vac/dc, ±10%; 230Vac

: 3 digits, red LED, 14,2 mm high.

: 1 NTC or PTC probe.

compressor:

3VA max

: free contact

SPDT relay 8(3) A, 250Vac or

SPST relay 20(8)A; 250Vac

: on the non-volatile memory (EEPROM).

1B;

Pollution grade:

0÷60 °C.

-30÷85 °C.

20÷85% (no condensing)

NTC probe: PTC probe:

0,1 °C or 1°C or 1 °F (selectable).

-40÷110°C (-40÷230°F)

-50÷150°C (-58÷302°F)

normal;

: ±0,7 °C ±1 digit

14. CONNECTIONS

14.1 XR20C: 8A COMPRESSOR

8(3)A250V

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Comp

Line

12Vac/dc supply: connect to the terminals 7 and 8. 24Vac/dc supply: connect to the terminals 7 and 8. 120Vac supply: connect to the terminals 7 and 8.

14.2 XR20C: 20A COMPRESSOR

20(8)A250V

 

Line

12Vac/dc supply: connect to the terminals 7 and 8. 24Vac/dc supply: connect to the terminals 7 and 8. 120Vac supply: connect to the terminals 7 and 8.

Comp

to par. “Con” and “COF”

switching off and on

wiring.

Software class:

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

Hot Key

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

Hot Key

the instrument.

Room

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15. DEFAULT SETTING VALUES

Label Name Range °C/°F

Set point LS÷US 3.0/37

Set

Differential

Minimum set point

Maximum set point

Thermostat probe calibration

Outputs delay at start up 0÷255 min 0

OdS

Anti-short cycle delay

Continuos cycle duration 0.0÷24.0h

CCt

Compressor ON time with faulty

COn

probe Compressor OFF time with faulty

COF

probe Kind of action CL=cooling; Ht= heating CL

Temperature measurement unit

Resolution

rES

Interval between defrost cycles

IdF

(Maximum) length for defrost

MdF

Displaying during defrost

dFd

MAX display delay after defrost 0 ÷ 255 min 30

dAd

Temperat. alarms configuration

ALc

MAXIMUM temperature alarm

ALU

Minimum temperature alarm

ALL

Temperature alarm delay

ALd

Delay of temperature alarm at

dAO

start up Digital input polarity oP=opening;CL=closing cL

i1P

Digital input configuration

i1F

Digital input alarm delay 0÷255min 5

did

Number of activation of pressure

Nps

switch Compressor status with open

odc

door: Kind of probe

PbC

Software release -- 4.0

rEL

Map code -- -

Ptb

0,1÷25.5°C/ 1÷ 255°F

-50°C÷SET/-58°F÷SET

SET÷110°C/ SET ÷ 230°F

-12÷12°C /-120÷120°F

0 ÷ 50 min

0 ÷ 255 min 0 ÷ 255 min

°C ÷ °F

in=integer; dE= dec.point

1÷ 120 ore

0÷ 255 min

rt, it, SEt, DEF

rE= related to set;

Ab = absolute

Set÷110.0°C; Set÷230°F

-50.0°C÷Set/ -58°F÷Set

0 ÷ 255 min

0 ÷ 23h e 50’

EAL=extern. alarm; bAL=lock regulation; PAL=press. switch; dor=door switch; dEF=defrost;

LHt=disabled; Htr= cooling -

heating

0 ÷15

no, Fan = normal;

CPr; F_C = Compr. OFF;

Ptc; ntc

2.0/4

-40,0/-40 110/230

0.0

15 30

°C/°F

dE/-

110/230

-50/-58 15

1.3

EAL

15 no

ntc/Ptc



Hidden parameters

Weiss Instruments, Inc.

905 Waverly Avenue

Dixell s.r.l. Z.I. Via dell’Industria, 27 32010 Pieve d’Alpago (BL) ITALY tel. +39 - 0437 - 98 33 - fax +39 - 0437 - 98 93 13

(PDLO GL[HOO#GL[HOOFRP  KWWSZZZGL[HOOFRP

Phone: 631 207 1200 - Fax: 631 207 0900

Holtsville, New York 11742

www.weissinstruments.com

Page 5

Controller ：DIXELL-XR20C Parameter setting code：D20-001M

Parameter setting sheet for Entree Refrigerator

CODE

PARAMETER

SET

Set

Main Set point

Differential(hysteresis)

Lower limit of main set point

Upper limit of main set point

Offset

-1

P2P

Evaporator probe presence

Evaporator probe calibration

Ods

Outputs delay at start up

Minimum time interval between the disactivation and successive activation on compressor

CCt

Continuous cycle duration

Con

Compressor on-time during by probe failure

COF

Compressor off-time during by probe failure

Unit of measure

℉

rES

Resolution

Lod

Probe displayed

Edf

Defrost termination setting

dtE

Defrost-end temperature

IdF

Time interval between defrost cycle

MdF

Max defrost cycle time

dFd

Displaying during defrost

SEt

dAF

Defrost delay after fast freezing

dAd

Real temperature display delay at defrost end

ALC

Temperature alarms configuration

ALU

Max temperature alarm differential

ALL

Minimum temperature alarm differential

ALd

Minimum or minimum temperature alarm delay

dAO

Delay of temperature alarm at start up

i1P

Digital input polarity

i1F

Digital input configuration

dor

did

Digital input alarm delay

NPS

Number of activation of pressure switch

Odc

Compressor and fan status when open door

Pbc

Kind of probe

ntc

dP1

Room probe display

dP2

Evaporator probe display

rEL

Software release

Ptb

Map code