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SVPOELETDS AHMz PS KTOwRQUE Password RUENMNOITNEG JAOUGTO FROEVREWRASRED PROGRAM AMUATNO FRoervwearsrde GPRAOM- RJOUBN ENTER SPEED RUNNING VOLTS REMOTE AMPS JOG Hz AUTO Kw FORWARD TORQUE REVERSE Password PROGRAM AUTO MAN PROGRAM Forward Reverse RUN JOB ENTER OPTIONAL METER PACKAGE INTEGRATED STARTER MODULE (ISM) OIL PUMP DISCONNECT CONTROL AND OIL HEATER DISCONNECT COMPRESSOR MOTOR DISCONNECT MANUAL RESET Fig. 7 — Variable Frequency Drive (VFD) SPEED RUNNING VOLTS REMOTE AMPS JOG Hz AUTO Kw FORWARD TORQUE REVERSE Password PROGRAM AMUATNO FRoervwearsrde LINE LOAD PROGRAM RUN JOB ENTER TXV + DC BUS BAR MEASUREMENT - POINT INITIAL DC BUS MEASUREMENT POINT + DANGER - HIGH VOLTAGE VFD MODULE COOLING LINES Fig. 8 — Variable Frequency Drive (VFD) Starter Internal View General — The 19XR hermetic centrifugal liquid chiller contains a microprocessor-based control center that monitors and controls all operations of the chiller (see Fig. 9). The mi- croprocessor control system matches the cooling capacity of the chiller to the cooling load while providing state-of-the-art chiller protection. The system controls cooling load within the set point plus the deadband by sensing the leaving chilled water or brine temperature and regulating the inlet guide vane via a mechanically linked actuator motor. The guide vane is a vari- able flow pre-whirl assembly that controls the refrigeration ef- fect in the cooler by regulating the amount of refrigerant vapor flow into the compressor. An increase in guide vane opening increases capacity. A decrease in guide vane opening decreases capacity. The microprocessor-based control center protects the chiller by monitoring the digital and analog inputs and execut- ing capacity overrides or safety shutdowns, if required. PIC II System Components — The chiller control system is called the PIC II (Product Integrated Control II). See Table 1. The PIC II controls the operation of the chiller by monitoring all operating conditions. The PIC II can diagnose a problem and let the operator know what the problem is and what to check. It promptly positions the guide vanes to main- tain leaving chilled water temperature. It can interface with auxiliary equipment such as pumps and cooling tower fans to turn them on when required. It continually checks all safeties to prevent any unsafe operating condition. It also regulates the oil heater while the compressor is off and regulates the hot gas by- pass valve, if installed. The PIC II controls provide critical pro- tection for the compressor motor and controls the motor starter. 11PDF Image | Carrier 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a Start-Up, Operation, and Maintenance Instructions Safety Considerations
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