Medium Voltage—Across-the-Line (2.3–6.6 kV). Trane Drives, CVHG, Starters, CVHF, Electrical Components, CVHE, CDHG, CDHF

CTV-PRB004.book Page 32 Sunday, December 18, 2011 6:39 PM

Medium-Voltage Starter Types (2,300–6,600 Volts)

Other options for remote-mounted starters are available in the Enhanced Electrical Protection

Package (see “Industrial-Grade Starters,” p. 63 .)

NEC 2005 changes for medium-voltage (2,300–6,600 volt) wire

NEC code for 2005 requires that medium-voltage cable is shielded. This affects the power wire selection and connection provisions to the chiller, and between the chiller and starter when it is remote mounted. When you use shielded cable, you must also use stress cones at the termination points (motor terminal connection, remote starter, or unit-mounted starter connection). Stress cones are composed of electrical shielding wrap and are typically 9–12 inches in length. Stress cones are used to confine the dielectric field and reduce electrical stresses at the termination point.

Trane ® unit-mounted medium-voltage starters now ship with a field-installed accessory “top hat” that is shown in our as-built submittal drawings. The top hat is enclosed in the starter cabinet during shipment and then reversed for field installation. Motor terminal boxes and remotemounted starters are designed to accommodate stress cones without an additional enclosure.

Refer to the appropriate submittals drawings to verify that the starter has sufficient connection space for your requirements. For more information regarding the top hat , refer to “Unit-Mounted

Starter Top Hat—NEC 2005 Code Requirement,” p. 40 .

Medium Voltage—Across-the-Line (2.3–6.6 kV)

Across-the-Line Starter (2,300–6,600 volts)

Figure 23, p. 33 shows a schematic for the most basic starter type; the across-the-line (X-Line) starter, which is also known as a full-voltage starter.To illustrate a typical starting sequence using a generic (non-Trane) schematic, refer to Figure 23, p. 33 and the starting sequence below.

Starting sequence

1. A “start” signal from the chiller controller energizes the pilot relay (PR).

2. The PR contacts close to energize the start/run contactor (1M).

3. The 1M contacts close to connect the compressor motor directly to the line.

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CTV-PRB004.book Page 33 Sunday, December 18, 2011 6:39 PM

Medium-Voltage Starter Types (2,300–6,600 Volts)

Figure 23. Simplified across-the-line wiring diagram

LINE

VOLTAGE

ACROSS-THE-LINE

STARTER WIRING

CTV-PRB004-EN

1M

1M

1M

OL

OL

OL

F

CPT

F

START-

STOP PR

PR

1M

Figure 24. Unit-mounted, across-the-line starter dimensions

Top Hat

9.13"

MOTOR

27"

26.2"

60"

40"

20"

38"

Standard features

• Control-power transformer

• Primary and secondary current transformers (CTs)

• Potential transformers (PTs)

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CTV-PRB004.book Page 34 Sunday, December 18, 2011 6:39 PM

Medium-Voltage Starter Types (2,300–6,600 Volts)

• Grounding provisions

• Bolted line-power connections

• Bolted load-side connections for remote starters

• Standard motor protection

Environmental specification

• Designed, developed, and tested in accordance with UL 347

• NEMA 1 enclosure as standard

• Operation from sea level to 6,000 ft (1,829 m)

• Operating ambient temperature range 32°F to 104°F (0°C to 40°C)

• Relative humidity, non-condensing 5 percent to 95 percent

• Non-operating ambient temperature range -40°F to 158°F (-40°C to 70°C)

• Voltage utilization range ±10 percent

Dimensions

Typical dimensions for unit- and remote-mounted across-the-line starters are shown in Figure 24, p. 33 and Figure 25, p. 34 . Always consult the submittal drawings for as-built dimensions.

Figure 25. Remote-mounted XL

80"

36"

30"

34 CTV-PRB004-EN