Daikin MicroTech III Installation And Maintenance Manual

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Daikin MicroTech III Installation And Maintenance Manual Manual pdf 5 page image

InTroduCTIonwww.DaikinApplied.com 5 IM 969-5 • MICROTECH III CHILLER UNIT CONTROLLERComponent DataThe Modbus communication module is a printed circuit boardwith a plastic enclosure. It connects directly to the left-handside of the MicroTech III chiller unit controller as shown inFigure 3. It may be possible that another module is alsoconnected to the unit controller. In this case, the Modbuscommunication module simply attaches directly to the left sideof the existing module instead of the unit controller.Figure 3: Modbus Communication Module Attached to Unit ControllerFigure 4 shows the important features of the Modbuscommunication module, which are described in the followingsection.Figure 4: Modbus Communication ModuleLight Emitting Diodes (LEDs)The Modbus communication module has a BSP LED and aBUS LED to indicate communication activity and status of theModbus communication module. These indicators are visiblewhen the module is connected to the MicroTech III chiller unitcontroller and the unit is powered on (Figure 4).BSP LEDThe BSP LED indicates the communication state between theModbus communication module and the MicroTech III chillerunit controller. Table 1 describes the status of the BSP LED.Table 1: BSP LED ActivityBSP LED Color DescriptionAlternating red andgreen flashing at onceper secondBoard Support Package (BSP) firmware upgrade inprogress.Green BSP is running. Communication is establishedbetween the unit controller and the communicationmodule.Yellow The communication module is capable ofcommunicating to the unit controller. However,communication is not established.Red flashing with 2Hz BSP (software) error.1Red Hardware error.11. In the event that this should occur, cycle power to the unit controller. Contactthe Daikin Applied Controls Customer Support group at 866-462-7829 foradditional assistance if necessary.RS-485 NetworkConnectorChannel 0BUS LEDBSP LED+ - RefRS-485 NetworkConnectorChannel 1(Not Used)