10 to 13.8kV Medium Voltage Motor . Trane CVHE-SVX02M-EN, CVHG, CVHF, CVHE

10 to 13.8kV Medium Voltage Motor

Figure 43.

Motor terminal box dimensions, in. (mm)

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All electrical circuits shall be treated as energized until all lockout/tagout procedures are in place and the circuit has been tested to verify that it is de-energized.

The medium-voltage motor terminal box cover must

NOT be removed if power is present, or if there is a possibility that power may be present. Working on energized medium-voltage circuits is not an approved practice for normal HVAC maintenance or service.

The motor is suitable for remote-mounted across-theline (including circuit breaker starting), primary reactor, autotransformer, or solid-state starting. Refer to the unit nameplate for motor data including RLA, LRA, etc.

In all cases of non-Trane supplied starters, the

Trane

Engineering Specification for UC800 Starter By Others

(available through your local Trane office) must be followed in order to ensure proper function and protection of the chiller. A disconnecting means and short-circuit protection must be installed ahead of the starter, unless they are included as part of the starter.

documentation, construction, compatibility, installation, start-up, or long term support of starters provided by others.

Motor Terminal Box

A large steel motor terminal box is provided to allow for the field connection of the motor power supply wire to the motor.

• Motor terminal box cover-only weight is 55 lb

(25 kg).

• Two 7/8-in. (22.225 mm) lifting holes are provided in the cover.

• Motor terminal box weight without the cover is

215 lb (97.5 kg).

• Two 3/8-in.–16 weld nuts are provided on the top of the terminal box to allow the use of properly rated lifting D-rings if removal is needed for clearance purposes.

purposes, the motor terminals MUST be protected against impact or stress damage.

Field fabrication of a cover or guard is required.

• The motor terminal box is large enough to accommodate the use of stress cones.

• If conduit is applied, a flexible connection of the conduit to the box should be made to allow for unit serviceability and for vibration isolation. The cable should be supported or protected against abrasion and wear on any edges or surfaces. Cable or conduit openings can be cut at any location in the box sides, top, or bottom for cable entry. Always ensure that NO debris remains in the box after cutting cable entry holes.

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Motor Supply Wiring

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Motor circuit wire sizing by the installer must be made in accordance with the National Electric Code (NEC) or any other applicable codes. All wiring to the

CenTraVac™ chiller motor must be shielded copper, with insulation rated to a minimum of 15kV.

Three terminals are provided on the chiller for the connection of power to the motor from the starter.

Power leads to motors must be in multiples of three, with equal phase representation in all conduits or wire trays. To limit the effects of corona or ionization with cables carrying more than 2000V, Trane requires that the power cable have a metallic shield, unless the cable is specifically listed or approved for non-shielded use.

If the cable is shielded, the shielding must be grounded at one end (grounding is typically done at the starter or supply end).

Care must be taken while routing the incoming cables to ensure that cable loads or tensions are not applied to the terminal or premature terminal failure could result.

Motor Terminals

Field-provided, ring-type lugs, with no sharp edges or corners, must be used by a qualified installer to connect the power wiring to the motor terminals.

Follow all instructions provided with the field-provided lugs to ensure proper connections.

recommended to reduce and control longitudinal and radial electrical stresses at the cable ends.

Prior to assembly the terminal stud, nuts, and lug should be inspected and cleaned to ensure they are not damaged or contaminated.

The terminal has a copper shaft that is threaded 9/16in.-18 UNF2A. Brass nuts are provided on the motor terminals to retain the lugs, and the final connection should be tightened to 22 to 25 ft·lb (29.8 to 33.9 N·m) using a 7/8-in. (22.225-mm) socket on a torque wrench.

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Before beginning wiring and torquing, ensure proper motor terminal care and do NOT apply any excess stress.

Ground Wire Terminal Lug

A ground wire lug is provided in the motor terminal box to allow the field connection of an earth ground.

The lug will accept a field-supplied ground wire of #8 to

#2 AWG. After completing the field connection of wiring, inspect and clean the motor terminals and motor housing, and remove any debris before reinstalling the motor terminal box cover. The cover must be re-installed onto the motor terminal box and all bolts installed. Do NOT operate the chiller with the motor terminal box cover removed or with any loose or missing cover bolts.

CVHE-SVX02M-EN 63