Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19XRV series: Start-up and service instructions Installation instructions Start-up, operation and maintenance instructions Start-up and service instructions User manual

Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual Manual pdf 35 page image

*6c£oo09rJ.2 mA(O%)Full 4 mAOpen (0.2%Full --Closedapprox,4 rnA*(_00%) 0 %surge more likely75 % Load Pointsurge less likely50 % Load Pointrotating stallless likely25 % Load PointI50 % 78 %* Diffuser full Span mA. GUIDE VANE OPENING (%)Fig. 21 -- Diffuser ControlDiffuser control output is enabled whenever the DIFFUSEROPTION is enabled, whether the machine is rtmning or not. Asshown in Fig. 21,0% output corresponds to a full open diffusel:The minimum closed position (25% Load Point value) will beat less than 100% for most diffusers (depending upon themodel). This coordinated guide vane-diffiJser operation may betested in the Control Test selection "IGV & SRD Actuator".Note that the diffuser actuator should NOT be forced to a great-er percent than the configured 25% Load Point (maximum)value. The diffuser opening can be incremented from fully opento completely closed. A 0% setting is tully open; a 100% settingis completely closed. To obtain file proper settings for DiffuserControl, contact a Carrier Engineering representative.PROPORTIONAL BANDS AND GAIN -- Proportiomfl bandis the rote at which capacity control (including guide vaneposition and, if applicable, VFD speed) is adjusted in propor-tion to how far the chilled water/brine temperature is from theCONTROL POINT. Proportional gain determines how quicklycapacity control reacts to how quickly the temperature ismoving from the CONTROL POINT. The proportional bandsand gain may be viewed or modified from the SETUP2 scleen,which is accessed from the EQUIPMENT SERVICE table.The Proportional Band -- Thele gu'e two response modes, onefor temperature response above the control point, the other forthe response below the control point.The temperature response above the control point is calledthe PROPORTIONAL INC BAND, and it can slow or quickencapacity control response to chilled water/brine temperaturesabove the CHILLED WATER DEADBAND. The PROPOR-TIONAL INCBAND can be adjusted from a setting of 2 to 10;the default setting is 6.5.The response below the control point is called the PRO-PORTIONAL DEC BAND, and it can slow or quicken the ca-pacity control response to chilled water temperature below thedeadband plus file control point. The PROPORTIONAL DECBAND can be adjusted on the ICVC from a setting of 2 to 10.The default setting is 6.0.NOTE: Increasing either of these settings causes the capacitycontrol to respond more slowly than at a lower setting.The PROPORTIONAL ECW GAIN can be adjusted on theICVC display for v_dues of 1, 2, or 3; the default setting is 2.Increase this setting to increase guide vane response to achange in entering chilled water temperatme.DEMAND LIMITING--The PIC III controls provide afeature for limiting AVERAGE LINE CURRENT or LINEKILOWATTS (demand) by limiting capacity via guide vanecontrol. The limit applied is called ACTIVE DEMANDLIMIT. which is equ_d to a BASE DEMAND LIMIT value(set in the SETPOINTS Screen, page 22, default value 100%),or that determined by AUTO DEMAND LIMIT INPUT (tinoptional 4 to 20 mA input, described below). ACTIVEDEMAND LIMIT may _flso be forced to be different fromBASE DEMAND LIMIT by manually overriding the value(forcing) from the MAINSTAT screen or writing a value via aCCN network device, or controlled by another chiller in LeadLag operation (see page 44).The demand limit may be based on either line cunent orkW. as indicated by DEMAND LIMIT SOURCE in theEQUIPMENT SERVICE/RAMP_DEM table. The default is 0,for demand limiting based on AVERAGE LINE CURRENT(percent of RATED LINE AMPS, as displayed on the defaultscreen). Setting DEMAND LIMIT SOURCE to 1 makesdemand limiting based on PERCENT LINE KILOWATTS(displayed in the MAINSTAT scleen). LINE KILOWATTS ismeasured by the VFD, and the MOTOR RATED LOAD kWvalue (100% rated kW) is set in the VFD_CONF table.If the DEMAND LIMIT SOURCE (percent line current)exceeds the ACTIVE DEMAND LIMIT by 5% or less, in-creases in guide vane opening will be prevented. If the DE-MAND LIMIT SOURCE (percent line current) exceeds theACTIVE DEMAND LIMIT by more than 5%, the guide vaneswill be forced to close. Also, as the DEMAND LIMITSOURCE approaches the ACTIVE DEMAND LIMIT from alower value, allowable capacity increases become increasinglymore limited, beginning when the DEMAND LIMITSOURCE is within the DEMAND LIMIT PROP BAND (con-figumble in the RAMP_DEM table).Demand Limit Control Option -- The demand limit controloption (20 mA DEMAND LIMIT OPT) is extern_fllycontrolled by a 4 to 20 mA signal from an energy managementsystem (EMS). The option is set up on the RAMP_DEMscreen. When enabled, 4 mA will set ACTIVE DEMANDLIMIT to 100% of the DEMAND LIMIT SOURCE Qegard-less of the value of BASE DEMAND LIMIT), and 20 mA willset ACTIVE DEMAND LIMIT to the value configured as"20MA DEMAND LIMIT OPT" in the RAMP_DEM table.Wire the auto demand limit input to terminals J5-1 (-) andJ5-2 (+) on the CCM. In order to use a 1 to 5 vdc input insteadof 4 to 20 mA, install a 25 ohm resistor in series with the + leadat terminal J5-2.A DEMAND KILOWATI'S monitoring feature is alsoavailable. This feature provides a display of average demand(power) in kilowatts (in the POWER screen). This v_due iscontinuously updated and averaged over the preceding timeinterval specified as DEMAND WATFS INTERVAL in the SER-VICE / EQUIPMENT SERVICE/RAMP DEM screen.CHILLER TIMERS AND STARTS COUNTER -- The PICIII m_dntains two run time clocks: COMPRESSOR ONTIMEand SERVICE ONTIME. COMPRESSOR ONTIME indicatesfile total lifetime compressor run hours. SERVICE ONTIME isa _esettable timer that can be used to indicate the hours sincefile last service visit or any other event. A separate countertallies compressor stmls as TOTAL COMPRESSOR STARTS.All of these can be viewed on the MA[NSTAT screen on theICVC. Both ontime counters roll over to 0 at 500,000 hom.s.Manual changes to SERVICE ONTIME from the ICVC mepermitted at any time. If the controller is replaced, one oppor-tunity, before the first st_utup with the new controllel; isprovided to set COMPRESSOR ONTIME and TOTALCOMPRESSOR STARTS to the last readings retained with theprior controllel: The SERVICE ONTIME timer can register upto 32,767 hours before it rolls over to zero.35