Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual

Also see for 48/50Z030-105: Installation instructions

Contents

Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual Manual pdf 160 page image

160APPENDIX D — VFD INFORMATIONOn variable air volume units with optional VFD, the supplyfan speed is controlled by a 3-phase VFD. The VFD is locatedin the supply fan section (030-050 units) or mixing box section(055-105 units) behind an access door. The VFD speed iscontrolled directly by the ComfortLink™ controls through a4 to 20 mA signal based on a supply duct pressure sensor.The VFD has a display, which can be used for service diagnos-tics, but setup of the building pressure and control loopfactors should be done through the scrolling marquee display.The VFD is powered during normal operation to preventcondensation from forming on the boards during the off modeand is stopped by driving the speed to 0 (by sending a 4 mAsignal to the VFD).The Z Series units use ABB VFDs. The interface wiring forthe VFDs is shown in Fig. A. The VFD connects throughan isolation board to the 4 to 20 mA RCB board. Terminaldesignations are shown in Table A. Configurations are shownin Table B.Table A — VFD Terminal DesignationsTERMINAL FUNCTIONU1V1W1 Three-Phase Main Circuit Input Power SupplyU2V2 Three-Phase AC Output to Motor, 0 V toW2 Maximum Input Voltage LevelX1-11 (GND)X1-12 (COMMON) Factory-supplied jumperX1-10 (24 VDC)X1-13 (DI-1) Run (factory-supplied jumper)X1-10 (24 VDC) Start Enable 1 (Factory-supplied jumper). WhenX1-16 (DI-4) opened the drive goes to emergency stop.X1-2 (AI-1)X1-3 (AGND) Factory wired for 4 to 20 mA remote inputFig. A — VFD Wiring