IPCX Chillers - Dunham-Bush Americas

DESIGN FEATURES: MICROCOMPUTER CONTROL○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○Advanced Microcomputer Control is a standard featureon allRotary Screw Chillersmonitoring analog and digital inputs to achieve precisecontrol of the major operational and protectivefunctions of the unit.Direct digital control (DDC) allows fingertip userinteraction. Its simple-to-use push button keyboard andmenu-driven software provide access to operatingconditions, control setpoints and alarm history clearlydisplayed on a prominent multi-line 80 characteralphanumeric display.An easy-to-install, inexpensive modem option allowsremote reading of operating parameter updates. Themicrocomputer insures its ownerstate-of-the-art efficiency and reliability.Display InformationThe 80 character alphanumeric liquid crystal displayutilizes easy-to-understand menu-driven software.Inexperienced operators can quickly work through thesemenus to obtain the information they require or tomodify control parameters. More experienced operatorscan bypass the menu systems, if desired, and movedirectly to their requested control function. At all times,assistance is available to the operator by simply pressingthe help key. Easily accessible measurements include:• Entering and Leaving chilled fluid temperature• Suction pressure and temperature• Discharge pressure and temperature• Oil pressure and temperature• Compressor motor amp draw• Compressor elapsed run time• Percent of slide valve loading• Reservoir oil temperature• Fluid temperature reset value• Demand limit reset value• Compressor starter status• Oil pump starter status• Fluid flow switch status• External start / stop command statusCapacity ControlLeaving chilled water temperature control isaccomplished by entering the leaving water temperaturesetpoint and placing the microcomputer in automaticcontrol. The unit will monitor all control functions andmove the slide valve to the required operating position.The compressor ramp (loading) cycle is programmableand may be set for specific building requirements.Remote adjustment of the leaving chilled water setpointis accomplished through either direct connection viaterminal or modem connected to the RS232communication port, or from an external BuildingAutomation System supplying a simple 0 to 5 VDCsignal. Remote reset of compressor current limit maybe accomplished in a similar fashion.System ControlThe unit may be started or stopped manually, or throughthe use of an external signal from a Building AutomationSystem. In addition, the microcomputer may beprogrammed with a seven-day operating cycle or othercontrol packages may start and stopthe system through inter-connecting wiring.Optional watering temperature monitoring (WTM) forentering and leaving condenser water temperature isavailable. With this option the operator can quicklyand accurately read the water temperatures andeliminate the need for thermometers.14