4/21/2021 0 Comments Dixell Cx 660 Manual
It is recommended to place the thermostat probe away from air streams to correctly measure the average room temperature.The instrument shall not be used for purposes different from those described hereunder.Check the application limits before proceeding.
SAFETY PRECAUTIONS 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 temperature changes with high atmospheric humidity to prevent formation of condensation Warning: disconnect all electrical connections before any kind of maintenance. In case of failure or faulty operation send the instrument back to the distributor or to Dixell S.r.l. 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 other, without crossing or intertwining. In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel with inductive loads could be useful. GENERAL DESCRIPTION The XM678D is a microprocessor based controller for multiplexed cabinets suitable for applications on medium or low temperature. It can be inserted in a proprietary LAN with up to 8 different sections which can operate, depending on the programming, as stand alone controllers or following the commands coming from the other sections. The XM678D is provided with 6 relay outputs to control the solenoid valve, defrost - which can be either electrical or hot gas - the evaporator fans, the lights, an auxiliary output and an alarm output and with the stepper valve driver. The device is also equipped with six probe inputs: for temperature control, for control the defrost end temperature, for display and the fourth can be used for application with virtual probe or for inletoutlet air temperature measurement. Moreover, fifth and sixth probe are used to evaluate and control the superheat. Finally, the XM678D is equipped with the three digital inputs (free contact) fully configurable by parameters. Dixell Cx 660 Serial Output RS485The optional direct serial output RS485 (ModBUS compatible) permits a simple XWEB interfacing. The HOT-KEY connector can be used to connect X-REP display (Depending on the model). INSTALLATION AND MOUNTING This device can operate without any user interface, but normal application is with Dixell CX660 keyboard. Figure 1a Figure 1b The CX660 keyboard shall be mounted on vertical panel, in a 29x71 mm hole, and fixed using the special bracket supplied as shown in fig. The temperature range allowed for correct operation is 0 to 60C. Avoid places subject to strong vibrations, corrosive gases, excessive dirt or humidity. Figure 1c 4. WIRING DIAGRAM AND CONNECTIONS 4.1 IMPORTANT NOTE XM device is provided with disconnectable terminal block to connect cables with a cross section up to 1.6 mm2 for all the low voltage connection: the RS485, the LAN, the probes, the digital inputs and the keyboard. Other inputs, power supply and relay connections are provided with screw terminal block or fast-on connection (5.0 mm). Heat-resistant cables have to be used. Before connecting cables make sure the power supply complies with the instruments 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. N.B. Maximum current allowed for all the loads is 16A. The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid infiltration.
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