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7 6 5 1 2 3 4 There is a display on the front of the Benshaw, Inc., solid- state starters that is useful for troubleshooting and starter checkout. The display indicates: • voltage to the SCRs • SCR control voltage • power indication • proper phasing for rotation • start circuit energized • over-temperature • ground fault • current unbalance • run state • software configuration The starter is further explained in the Check Starter and Troubleshooting Guide sections, pages 54 and 76. Unit-Mounted Wye-Delta Starter (Optional) — The 19XR chiller may be equipped with a wye-delta starter mounted on the unit. This starter is used with low-voltage mo- tors (under 600 v). It reduces the starting current inrush by con- necting each phase of the motor windings into a wye configu- ration. This occurs during the starting period when the motor is accelerating up to speed. Once the motor is up to speed, the starter automatically connects the phase windings into a delta configuration. Starter control, monitoring, and motor protec- tion is provided by Carrier’s Integrated Starter Module (ISM). Unit-Mounted VFD (Optional) — The 19XRV unit will be equipped with a variable frequency drive motor controller mounted on the unit. See Fig. 7 and 8. This VFD is used with low voltage motors between 380 and 480 VAC. It re- duces the starting current inrush by controlling the voltage and frequency to the compressor motor. Once the motor has accel- lerated to minimum speed the PIC II modulates the compressor speed and guide vane position to control chilled water tempera- ture. The VFD is further explained in the Controls section and Troubleshooting Guide section, pages 10 and 76. There is a separate display located on the unit-mounted VFD. Operational parameters and fault codes are displayed rel- ative to the drive. Refer to specific drive literature along with troubleshooting sections. The display is also the interface for entering specific chiller operational parameters. These parame- ters have been preprogrammed at the factory. An adhesive backed label on the inside of the drive has been provided for verification of the specific job parameters. See Initial Start-Up Checklist section for details. CONTROLS Definitions ANALOG SIGNAL — An analog signal varies in proportion to the monitored source. It quantifies values between operating limits. (Example: A temperature sensor is an analog device be- cause its resistance changes in proportion to the temperature, generating many values.) DISCRETE SIGNAL — A discrete signal is a 2-position rep- resentation of the value of a monitored source. (Example: A switch produces a discrete signal indicating whether a value is above or below a set point or boundary by generating an on/off, high/low, or open/closed signal.) LEGEND 1 — RediStartTM MICRO Input/Output Card 2 — Fuses 1-4 (Hidden, not depicted) 3 — Circuit Breaker 2 (CB2): Machine Control and Heater Power 4 — Circuit Breaker 3 (CB3): Oil Pump Power 5 — RediStart MICRO Central Processing Unit Card (CPU) 6 — RediStart MICRO Power Card (hidden, not depicted) 7 — RediStart MICRO Bypass Card (hidden, not depicted) Fig. 5 — Solid-State Starter Box, Internal View Fig. 6 — Typical Starter External View (Solid-State Starter Shown) 10PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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