Carrier 19XR, XRV specifications Unit-Mounted Wye-Delta Starter Optional, Controls, Definitions

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LEGEND

1— RediStart 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)

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 control- ler mounted on the unit. See Fig. 7 and 8. This VFD is used with low voltage motors between 380 and 480 VAC. It reduces the starting current inrush by controlling the voltage and fre- quency to the compressor motor. Once the motor has accelerat- ed 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.)

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