Carrier 30XA Operation Instructions Manual

Carrier 30XA Operation Instructions Manual Manual pdf 6 page image

63 - HARDWARE DESCRIPTION3.1 - General descriptionEach.circuit.is.by.default.fitted.with.one.SIOB.board.used.to.manage all inputs and outputs of the controller. TCPM boardis used to control the operation of screw compressors andAUX1 board is used for fans control (one AUX1 per eachcircuit). Options such as energy management, heat reclaim,free cooling require additional SIOB boards to be installed.Additionally,.chillers.fitted.with.a.dry.cooler.have.one.extra.AUX1 board used to control the optional dry cooler.All boards communicate via an internal LEN bus. The mainboard continuously monitors the information received fromvarious pressure and temperature probes and accordinglystarts the program that controls the unit.The unit is equipped with the Touch Pilot user interface (5-inch colour LCD touch screen).3.4 - Power supply to boardsAll boards are supplied from a common 24 VAC supplyreferred to earth.CAUTION: Maintain correct polarity when connecting thepower supply to the boards, otherwise the boards may bedamaged.In the event of a power supply interrupt, the unit restartsautomatically without the need for an external command.However, any faults active when the supply is interruptedare saved and may in certain cases prevent a given circuit orthe unit from restarting.Legend:1. USB connector2. Ethernet connector3. CCN connector4. LEN connector5. Power supplyconnector (24 VAC)1 2 3 4 53.3 - Light emitting diodes on boardsConnections are located on the bottom side of the maincontroller.3.2 - Electrical boxThe electrical box includes all boards controlling the unitand the user interface.3.5 - Light emitting diodes on boardsAll boards continuously check and indicate the properoperation of their electronic circuits. A light emitting diode(LED) lights on each board when it is operating properly.•. The.red.LED.flashing.for.a.two-second.period.on.the.SIOB board indicates correct operation. A differentrate indicates a board or a software failure.•. The.green.LED.flashes.continuously.on.all.boards.to.show that the board is communicating correctly overits.internal.bus..If.the.green.LED.is.not.flashing,.this.indicates a LEN bus wiring problem.