Carrier AquaEdge 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19XR: Controls operation and troubleshooting Start-up, operation and maintenance instructions Start-up, operation and maintenance instructions

Carrier AquaEdge 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 10 page image

10STARTING EQUIPMENTThe 19XR chiller requires a motor starter to operate the centrif-ugal hermetic compressor motor, the oil pump, and variousauxiliary equipment components. The starter is the main fieldwiring interface for the contractor.See Carrier’s specification for specific starter requirements. Allstarters must meet these specifications in order to properly startand satisfy mechanical safety requirements.It is possible that there are two separate circuit breakers insidethe starter. These include (1) the main compressor motor cir-cuit breaker, and (2) a circuit breaker which provides power tothe chiller control panel. The latter is typically wired in parallelwith the first so that power is provided to those services whenthe main breaker is open. The disconnect switch on the starterfront cover is connected to the main breaker. Typically, sepa-rate 3-phase power sources as per job requirements are sup-plied to the control panel to power the oil pump, heater, andcontrols.All starters must include a Carrier control module called the In-tegrated Starter Module (ISM). This module controls and mon-itors all aspects of the starter. See the Controls Operation andTroubleshooting guide for additional ISM information. ContactCarrier’s Replacement Component Division (RCD) for re-placement parts. Current standard North America starter typesare Across the Line, Solid-State, Auto-Transformer, and VFD(variable frequency drive).Solid-State Starter (Optional)The 19XR chiller may be equipped with a solid-state, reduced-voltage starter. This starter’s primary function is to provide on-off control of the compressor motor. This type of starter reduc-es the peak starting torque, controls the motor inrush current,and decreases mechanical shock. This capability is summed upby the phrase “soft starting.” Consult E-Cat for full informa-tion about starter offerings. The solid-state starter manufactur-er’s name is located inside the starter access door.A solid-state, reduced-voltage starter operates by reducing thestarting voltage. The starting torque of a motor at full voltage istypically 125% to 175% of the running torque. When the voltageand the current are reduced at start-up, the starting torque is re-duced as well. The object is to reduce the starting voltage to ad-just the voltage necessary to develop the torque required to getthe motor moving. The voltage is reduced by silicon controlledrectifiers (SCRs). The voltage and current are then ramped up ina desired period of time. Once full voltage is reached, a bypasscontactor is energized to bypass the SCRs.The display on the front of the solid-state starter is useful fortroubleshooting and starter checkout. The display indicates:• line voltage• control voltage status• power indication• proper phasing for rotation• start circuit energized• ground fault• current unbalance• run stateThe starter is further explained in the Check Starter section,page 19.Free-Standing Medium Voltage VFD (Optional)For optimum efficiency, the 19XR chiller can be combinedwith a VFD. This option is a free-standing, medium voltagecurrent source drive that does not require a transformer be-tween the power source and the drive. The drive meets IEEE-519 specifications.WARNINGThe main circuit breaker on the front of the starter discon-nects the main motor power only. Power may be still ener-gized for other circuits. Always check wiring diagrams be-fore initiating any work on the chiller and follow applicablelock-out/tag-out procedures. Failure to disconnect powerwill result in personal injury.WARNINGWhen voltage is supplied to the solid-state circuitry (CB1 isclosed), the heat sinks in the starter as well as the wires lead-ing to the motor and the motor terminal are at line voltage.Do not touch the heat sinks, power wiring, or motor termi-nals while voltage is present or serious injury will result.