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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.
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The instrument shall not be used for purposes different from those described hereunder. It cannot be used as a safety device.
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Check the application limits before proceeding.
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Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring the same and unchanged functionality.
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1.2
SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
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Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden temperature changes with high
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atmospheric humidity to prevent formation of condensation
Warning: disconnect all electrical connections before any kind of maintenance.
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Fit the probe where it is not accessible by the End User. The instrument must not be opened.
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In case of failure or faulty operation send the instrument back to the distributor or to "Dixell S.r.l." (see address) with a detailed description of the
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fault.
Consider the maximum current which can be applied to each relay (see Technical Data).
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Ensure that the wires for probes, loads and the power supply are separated and far enough from each other, without crossing or intertwining.
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In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with inductive loads could be useful.
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2. GENERAL DESCRIPTION
Models XLR130 and XLR170, 210x230mm format, are microprocessor based controllers suitable for applications on medium or low temperature
refrigerating units. They are provided with four (XLR130) or six (XLR170) relay outputs to control compressor, defrost - which can be either electrical
or hot gas (XLR170) - the evaporator fans (XLR170), the lights, the alarm and an auxiliary output. They are also provided with three NTC or PTC
probe inputs, one for temperature control, one to control the defrost end temperature of the evaporator and the third, optional, for the display. There
are two digital inputs (free contact) for the door switch and configurable by parameter.
The standard TTL output allows the user to connect, by means of a TTL/RS485 external module, a ModBUS-RTU compatible monitoring system and
to programme the parameter list with the "Hot Key".
Each model in the XLR100 can be provided with a Real Time Clock which allows programming of up to eight daily defrost cycles, divided into
holidays and workdays. A "Day and Night" function with two different set points is fitted for energy saving.
3. CONTROLLING LOADS
3.1 THE 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.
In case of fault in the thermostat probe the start and stop of the compressor are timed through parameters "COn" and "COF".
3.2 FAST FREEZING
When defrost is not in progress, it can be activated the keypad by holding the o 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, o for about 3 seconds.
3.3 DEFROST
3.3.1 XLR130 – TIMED DEFROST
The defrost interval is controlled by means of parameter "EdF":
with EdF=in the defrost is made every "IdF" time,
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with EdF=Sd the interval "IdF" is calculate through Smart Defrost algorithm (the counter is increased only when the compressor is ON).
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with real time clock present EdF can be set to "rtc", In this case, the defrost is made in real time depending on the hours set in the parameters
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Ld1..Ld8 on workdays and in Sd1...Sd8 in holidays;
Defrost is performed through a simple stop of the compressor. Parameter "IdF" controls the interval between defrost cycles, while its length is
controlled by parameter "MdF".
3.3.2 XLR170 – HEATER OR HOT GAS DEFROST
Three defrost modes are available through the "tdF" parameter: defrost with electrical heater (tdF=rE), hot gas (tdF=in), or thermostatic defrost
(tdF=rt).
1592017000 XLR 130-170 GB r2.0 23.03.2015
XL130 - XLR170
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