Dixell XR35CH User Manual

Digital controller for medium temperature

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.

Time

Temper.

Compr.

SET

LED

MODE

FUNCTION

Compressor enabled

Flashing

Anti-short cycle delay enabled

Defrost enabled

Flashing

Drip time in progress

An alarm is occurring

Continuous cycle is running

ECO

Energy saving enabled

Light on ON

Auxiliary relay on

°C/°F

Measurement unit

°C/°F

Flashing

Programming phase

refrigeration applications

XR35CH

-Manual for the SW rel. 2.6-

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.  Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring

the same and unchanged functionality.

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 limits avoiding sudden

 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 not be opened.  In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S. r.l.” (see

 Consider the maximum current which can be applied to each relay (see Technical Data).  Ensure that the wires for probes, loads and the power supply are separated and far enough from each

 In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel

2. GENERAL DESCRIPTION

Model XR35CH, format 32 x 74 mm, is a digital thermostat with off cycle defrost designed for refrigeration applications at normal temperature. It provides two relay outputs, one for the compressor, the other one can be used as light, for alarm signalling or as auxiliary output.. It could be provided with a Real Time Clock which allows programming of up to 6 daily defrost cycles, divided into holidays and workdays. A “Day and Night” function with two different set points is fitted for energy saving. It is also provided with up to four NTC or PT1000 probe inputs, the first one for temperature control, the second one, to be located onto the evaporator, to control the defrost termination temperature. One of the 2 digital inputs can operate as third temperature probe. The fourth probe is used to signal the condenser temperature alarm or to display a temperature. The RS485 serial output allows to connect the unit to a network line ModBUS-RTU compatible such as the dIXEL monitoring units of X-WEB family. The HOT key receptacle allows to program the controller by means the HOT KEY programming keyboard. The instrument is fully configurable through special parameters that can be easily programmed through the keyboard.

3. CONTROLLING LOADS

3.1 COMPRESSOR

SAFETY PRECAUTIONS

temperature changes with high atmospheric humidity to prevent formation of condensation

address) with a detailed description of the fault.

other, without crossing or intertwining.

with inductive loads could be useful.

b. Auxiliary thermostat I.E.. anti condensing heater) with the possibility of switching it on and off also by keyboard Parameters involved:

- ACH Kind of regulation for the auxiliary relay: Ht: heating; cL: cooling;

- SAA Set point for auxiliary relay

- SHy Differential for auxiliary relay

- ArP Probe for auxiliary relay

- Sdd Auxiliary output off during defrost By means of these 5 parameters the functioning of the auxiliary relay can be set.. The differential is given by the SHy parameter. NOTE: Set oA1 =AUS and ArP= nP (no probe for auxiliary output). In this case the relay 1-7 can be activated only by digital input with i1F or i2F = AUS.

3.3.4 On/off relay – oA1 = onF

In this case the relay is activated when the controller is turned on and de-activated when the controller is turned off.

3.3.5 Neutral zone regulation

With oA1 = db the relay 1-7 can control a heater element to perform a neutral zone action. oA1 cut in = SET-HY oA1 cut out = SET

3.3.6 Alarm relay

With oA1 = ALr the relay 1-7 operates as alarm relay. It is activated every time an alarm happens. Its status depends on the tbA parameter: if “tbA = y”, the relay is silenced by pressing any key. If “tbA = n”, the alarm relay remains on until the alarm condition recovers.

3.3.7 Night blind management during energy saving cycles

With oA1 = HES, the relay 1-7 operates to manage the night blind: the relay is energised when the energy saving cycle is activated , by digital input, frontal button or RTC (optional)

4. FRONT PANEL COMMANDS

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

operation.

(DEF) To start a manual defrost

(UP): To see the max. stored temperature; in programming mode it browses the parameter

codes or increases the displayed value.

(DOWN) To see the min stored temperature; in programming mode it browses the parameter

codes or decreases the displayed value.

To switch the instrument off, if onF = oFF.

To switch the light, if oA1 = Lig.

KEY COMBINATIONS:

+ To enter in programming mode. + To return to the room temperature display.

To lock & unlock the keyboard.



4.1 USE OF LEDS

Each LED function is described in the following table.

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

With oA1 different from dEF and tdF = EL the controller performs timed defrost, simply stopping the compressor. With oA1 = dEF two defrost modes are available through the “tdF” parameter: defrost through electrical heater (tdF = EL) and hot gas defrost (tdF = in), in this case the second relay has to set ase The defrost interval depends on the presence of the RTC (optional). If the RTC is present is controlled by means of parameter “EdF”:

- with EdF=in the defrost is made every “IdF” time – standard way for controller without RTC.

- with EdF = “rtc”, the defrost is made in real time depending on the hours set in the parameters

Ld1..Ld6 on workdays and in Sd1…Sd6 in holidays; Other parameters are used to control defrost cycles: its maximum length (MdF) and two defrost modes: timed or controlled by the evaporator’s probe (P2P).

3.3 SECOND RELAY CONFIGURATION (PAR. OA1; TERM. 1-7)

The functioning of the auxiliary relay (terminals. 1-7) can be set by the oA1 parameter, according to the kind of application. In the following paragraph the possible setting:

3.3.1 Defrost relay – oA1 = dEF

With oA1 = dEF the second relay operates as defrost relay. See paragraph 3.2 for more details.

3.3.2 Light relay

With oA1 = Lig the relay 1-7 operates as a light.

3.3.3 Auxiliary relay – oA1 = AUS

a. Relay activation by digital input 2 (oA1 = AUS, i2F = AUS)

With oA1 = AUS and i2F = AUS the relay 1-7 is switched on and off by digital.

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5. MAX & MIN TEMPERATURE MEMORIZATION

5.1 HOW TO SEE THE MIN TEMPERATURE

1. Press and release the n key.

2. The “Lo” message will be displayed followed by the minimum temperature recorded.

3. By pressing the n key again or by waiting 5s the normal display will be restored.

5.2 HOW TO SEE THE MAX TEMPERATURE

1. Press and release the o key.

2. The “Hi” message will be displayed followed by the maximum temperature recorded.

3. By pressing the o key again or by waiting 5s the normal display will be restored.

5.3 HOW TO RESET THE MAX AND MIN TEMPERATURE RECORDED

1. Push and immediately release the SET key: the display will show the Set

point value;

2. Push and immediately release the SET key or wait for 5 seconds to

Push the DEF key for more than 2 seconds and a manual defrost will start.

With “onF = oFF”, pushing the ON/OFF key, the instrument is switched off. The “OFF” message is displayed. In this configuration, the regulation is disabled. To switch the instrument on, push again the ON/OFF key.

1. Hold press the SET key for more than 3s, while the max. or min temperature is displayed. (rSt

message will be displayed)

2. To confirm the operation the “rSt” message starts blinking and the normal temperature will be

displayed.

6. MAIN FUNCTIONS

6.1 TO SET THE CURRENT TIME AND DAY (ONLY FOR INSTRUMENTS WITH RTC)

When the instrument is switched on, it’s necessary to program the time and day.

1. Enter the Pr1 programming menu, by pushing the SET + n keys for 3s.

2. The rtc parameter is displayed. Push the SET key to enter the real time clock menu.

3. The Hur (hour) parameter is displayed.

4. Push the SET and set current hour by the UP and Down keys, then push SET to confirm

the value..

5. Repeat the same operations on the Min (minutes) and dAy (day) parameters.

To exit: Push SET+UP keys or wait for 15 sec without pushing any keys.

6.2 HOW TO SEE THE SET POINT

display the probe value again.

6.3 HOW TO CHANGE THE SET POINT

1. Push the SET key for more than 2 seconds to change the Set point value;

2. The value of the set point will be displayed and the “°C” or “°F”

3. To change the Set value push the o or n arrows within 10s.

4. To memorise the new set point value push the SET key again or wait 10s.

LED starts blinking;

6.4 HOW TO START A MANUAL DEFROST

6.5 HOW TO CHANGE A PARAMETER VALUE

To change the parameter’s value operate as follows:

1. Enter the Programming mode by pressing the Set + n keys for 3s (the “°C” or “°F”

blinking).

2. Select the required parameter. Press the “SET” key to display its value

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

4. Press “SET” to store the new value and move to the following parameter.

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.

LED starts

6.6 THE HIDDEN MENU

The hidden menu Includes all the parameters of the instrument.

6.6.1 HOW TO ENTER THE HIDDEN MENU

1. Enter the Programming mode by pressing the Set + n keys for 3s (the “°C” or “°F”

blinking).

2. Released the keys, then push again the Set+n keys for more than 7s. The Pr2 label will be

displayed immediately followed from the HY parameter. NOW YOU ARE IN THE HIDDEN MENU.

3. Select the required parameter.

4. Press the “SET” key to display its value

5. Use o or n to change its value.

6. Press “SET” to store the new value and move to the following parameter.

To exit: Press SET + o or wait 15s without pressing a key. NOTE1: if none parameter is present in Pr1, after 3s the “noP” message is displayed. Keep the keys

pushed till the Pr2 message is displayed. NOTE2: the set value is stored even when the procedure is exited by waiting the time-out to expire.

6.6.2 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 + n”. In HIDDEN MENU when a parameter is present in First Level the decimal point is on.

LED starts

6.7 HOW TO LOCK THE KEYBOARD

1. Keep pressed for more than 3 s the UP + DOWN keys.

2. 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

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

6.8 TO UNLOCK THE KEYBOARD

Keep pressed together for more than 3s the o and n keys, till the “Pon” message will be displayed.

6.9 THE CONTINUOUS CYCLE

When defrost is not in progress, it can be activated by holding the “o” key pressed for about 3

seconds. The compressor operates to maintain the “ccS” set point 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 “o” for 3 seconds.

6.10 THE ON/OFF FUNCTION

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WARNING: Loads connected to the normally closed contacts of the relays are always supplied and under voltage, even if the instrument is in stand by mode.

7. PARAMETERS

rtc Real time clock menu (only for controller with RTC): to set the time and date and defrost start

time.

REGULATION Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point. Compressor Cut IN is

Set Point + differential (Hy). Compressor Cut OUT is when the temperature reaches the set point.

LS Minimum set point: (-100°C÷SET/-148°F÷SET): Sets the minimum value for the set point. US Maximum set point: (SET÷110°C/ SET÷230°F). Set the maximum value for set point. Ot Thermostat probe calibration: (-12.0÷12.0°C; -120÷120°F) allows to adjust possible offset of

the thermostat probe.

P2P Evaporator probe presence: n= not present: the defrost stops by time; y= present: the defrost

stops by temperature.

OE Evaporator probe calibration: (-12.0÷12.0°C; -120÷120°F). allows to adjust possible offset of

the evaporator probe.

P3P Third probe presence (P3): n= not present:, the terminals 18-20 operate as digital input.; y=

present:, the terminals 18-20 operate as third probe.

O3 Third probe calibration (P3): (-12.0÷12.0°C; -120÷120°F). allows to adjust possible offset of the

third probe.

P4P Fourth probe presence: (n = Not present; y = present). o4 Fourth probe calibration: (-12.012.0°C) allows to adjust possible offset of the fourth 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.

rtr Percentage of the second and first probe for regulation (0÷100; 100 = P1, 0 = P2 ): it allows

to set the regulation according to the percentage of the first and second probe, as for the following formula (rtr(P1-P2)/100 + P2).

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.

CCS Set point for continuous cycle: (-100÷150°C) it sets the set point used during the continuous

cycle.

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. 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. Lod Instrument display: (P1; P2, P3, P4, SET, dtr): it selects which probe is displayed by the

instrument: P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe(only for model with this option enabled); P4 = Fourth probe, SET = set point; dtr = percentage of visualization.

rEd X- REP display (optional): (P1; P2, P3, P4, SET, dtr): it selects which probe is displayed by X-

REP: P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe(only for model with this option enabled); P4 = Fourth probe, SET = set point; dtr = percentage of visualization.

dLy Display delay: (0 ÷20.0m; resul. 10s) when the temperature increases, the display is updated of

1 °C/1°F after this time.

dtr Percentage of the second and first probe for visualization when Lod = dtr (0÷100; 100 =

P1, 0 = P2 ): if Lod = dtr it allows to set the visualization according to the percentage of the first

and second probe, as for the following formula (dtr(P1-P2)/100 + P2).

DEFROST EdF Defrost mode (only for controller with RTC):

rtc = Real Time Clock mode. Defrost time follows Ld1÷Ld6 parameters on workdays and

Sd1÷Sd6 on holidays.

in = interval mode. The defrost starts when the time “Idf” is expired. tdF Defrost type: EL = electrical heater; in = hot gas dFP Probe selection for defrost termination: nP = no probe; P1 =thermostat probe; P2 =

evaporator probe; P3 =configurable probe; P4 = Probe on Hot Key plug. dtE Defrost termination temperature: (-50÷50 °C/

-58÷122°F) (Enabled only when EdF=Pb) sets the temperature measured by the evaporator

probe, which causes the end of 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) When 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. dSd Start defrost delay: ( 0÷99min) This is useful when different defrost start times are necessary to

avoid overloading the plant.

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

SEt = set point; dEF = “dEF” label) dAd MAX display delay after defrost: (0÷255min). Sets the maximum time between the end of

defrost and the restarting of the real room temperature display. Fdt Drip time: (0120 min) time interval between reaching defrost termination temperature and the

restoring of the control’s normal operation. This time allows the evaporator to eliminate water

drops that might have formed due to defrost.

dPo First defrost after start-up: (y = immediately; n = after the IdF time) dAF Defrost delay after continuous cycle: (023.5h) time interval between the end of the fast

freezing cycle and the following defrost related to it.

AUXILIARY THERMOSTAT CONFIGURATION (terms. 1-7) – OA1 = AUS ACH Kind of regulation for auxiliary relay: Ht = heating; CL = cooling

SAA Set Point for auxiliary relay: (-100÷110,0°C; -148÷230°F) it defines the room temperature set

point to switch auxiliary relay. SHy Differential for auxiliary output: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for auxiliary

output set point.

With ACH = cL AUX Cut in is SAA + SHy; . AUX Cut out is SAA

With ACH = Ht AUX Cut in is SAA - SHy; . AUX Cut out is SAA

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