Chrysler LLCConstruction Standards

12/17/04

SECTION 16443 – MOTOR – CONTROL CENTERS

PART 1 - PART 1 - GENERAL

1.1SUMMARY

  1. This Section includes ac motor-control devices rated 600V and less that are supplied as enclosed units.

1.2QUALITY ASSURANCE

  1. Source Limitations: Obtain similar motor-control devices through one source from a single manufacturer.
  2. Comply with NFPA70.
  3. Listing and Labeling: Provide motor controllers specified in this Section that are listed and labeled.
  4. The Terms "Listed" and "Labeled": As defined in the National Electrical Code, Article100.

1.3COORDINATION

  1. Coordinate features of controllers and accessory devices with pilot devices and control circuits to which they connect.
  2. Coordinate features, accessories, and functions of each motor controller with the ratings and characteristics of the supply circuit, the motor, the required control sequence, and the duty cycle of the motor and load.

PART 2 - PRODUCTS

2.1MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. Siemens Energy & Automation, Inc.
  3. Allen-Bradley Co.; Industrial Control Group.
  4. Eaton Corp.; Westinghouse & Cutler-Hammer Products.
  5. General Electric Co.; Electrical Distribution & Control Div.
  6. Square D Co.

2.2MANUAL MOTOR CONTROLLERS

  1. Description: NEMAICS2, general purpose, ClassA with toggle action and overload element.

2.3MAGNETIC MOTOR CONTROLLERS

  1. Description: NEMAICS2, ClassA, full voltage, nonreversing, across the line, unless otherwise indicated.
  2. Control Circuit: 120V; obtained from integral control power transformer, unless otherwise indicated. Include a control power transformer with adequate capacity to operate connected pilot, indicating and control devices, plus 50 VA spare capacity.
  3. Combination Controller: Factory-assembled combination controller and disconnect switch with or without overcurrent protection as indicated.
  4. Fusible Disconnecting Means: NEMAKS1, heavy-duty, fusible switch with rejection-type fuse clips rated for fuses indicated. Select and size fuses to provide Type2 protection according to IEC947-4-1, as certified by a Nationally Recognized Testing Laboratory.
  5. Nonfusible Disconnect: NEMAKS1, heavy-duty, nonfusible switch.
  6. Circuit-Breaker Disconnect: NEMAAB1, motor-circuit protector with field-adjustable short-circuit trip coordinated with motor locked-rotor amperes.
  7. Overload Relay: Ambient-compensated type with inverse-time-current characteristic. Provide with heaters or sensors in each phase matched to nameplate full-load current of specific motor to which they connect, and with appropriate adjustment for duty cycle.

2.4ENCLOSURES

  1. Description: Flush or surface-mounted cabinets as indicated. NEMA250, Type12, unless otherwise indicated to meet environmental conditions at installed location.

2.5ACCESSORIES

  1. Devices are factory installed in controller enclosure, unless otherwise indicated.
  2. Push-Button Stations, Pilot Lights, and Selector Switches: NEMAICS2, heavy-duty type.
  3. Control Relays: Auxiliary and adjustable time-delay relays.

PART 3 - EXECUTION

3.1APPLICATIONS

  1. Select features of each motor controller to coordinate with ratings and characteristics of supply circuit and motor; required control sequence; duty cycle of motor, drive, and load; and configuration of pilot device and control circuit affecting controller functions.
  2. Select horsepower rating of controllers to suit motor controlled.
  3. Use fractional-horsepower manual controllers for single-phase motors, unless otherwise indicated.
  4. Push-Button Stations: In covers of magnetic controllers for manually started motors where indicated, start contact connected in parallel with sealing auxiliary contact for low-voltage protection.
  5. Hand-Off-Automatic Selector Switches: In covers of manual and magnetic controllers of motors started and stopped by automatic controls or interlocks with other equipment.

3.2INSTALLATION

  1. Install independently mounted motor-control devices according to manufacturer's written instructions.
  2. Location: Locate controllers within sight of motors controlled, unless otherwise indicated.
  3. For control equipment at walls, bolt units to wall or mount on lightweight structural-steel channels bolted to wall. For controllers not at walls, provide freestanding racks.
  4. Motor-Controller Fuses: Install indicated fuses in each fusible switch.

3.3IDENTIFICATION

  1. Identify motor-control components and control wiring according to Division16 Section "Electrical Identification."

3.4CONTROL WIRING INSTALLATION

  1. Bundle, train, and support wiring in enclosures.
  2. Connect hand-off-automatic switch and other automatic control devices where available.
  3. Connect selector switches to bypass only the manual and automatic control devices that have no safety functions when switch is in the hand position.
  4. Connect selector switches with motor-control circuit in both hand and automatic positions for safety-type control devices such as low- and high-pressure cutouts, high-temperature cutouts, and motor overload protectors.

3.5CONNECTIONS

  1. Tighten connectors, terminals, bus joints, and mountings. Tighten field-connected connectors and terminals, including screws and bolts, according to manufacturer's published torque-tightening values. Where manufacturer's torque values are not indicated, use those specified in UL486A and UL486B.

3.6FIELD QUALITY CONTROL

  1. Testing: After installing motor controllers and after electrical circuitry has been energized, demonstrate product capability and compliance with requirements.
  2. Procedures: Perform each visual and mechanical inspection and electrical test stated in NETAATS, Sections 7.5, 7.6, and 7.16. Certify compliance with test parameters.
  3. Remove and replace malfunctioning units with new units, and retest.

3.7CLEANING

  1. Remove paint splatters and other spots, dirt, and debris. Touch up scratches and mars of finish to match original finish. Clean devices internally, using methods and materials recommended by manufacturer.

END OF SECTION

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