SECTION 26 24 19
MOTOR CONTROL
PART 1 GENERAL
1.1
SECTION SUMMARY
A. Section includes:
1. Full-voltage magnetic controllers.
2. Wall mounted starters.
3. Manual motor starters.
4. Installation.
1.2
DEFINITIONS
A. BAS: Building automation system.
B. CPT: Control power transformer.
C. EMI: Electromagnetic interference.
D. GFCI: Ground fault circuit interrupting.
E. IGBT: Insulated-gate bipolar transistor.
F. LAN: Local area network.
G. LED: Light-emitting diode.
H. MCC: Motor-control center.
I.
MCCB: Molded-case circuit breaker.
J.
MCP: Motor-circuit protector.
K. NC: Normally closed.
L. NO: Normally open.
M. OCPD: Overcurrent protective device.
N. PCC: Point of common coupling.
O. PID: Control action, proportional plus integral plus derivative.
P. PT: Potential transformer.
Q. PWM: Pulse-width modulated.
R. RFI: Radio-frequency interference.
S. SCR: Silicon-controlled rectifier.
T. TDD: Total demand (harmonic current) distortion.
U. THD(V): Total harmonic voltage demand.
V. TVSS: Transient voltage surge suppressor.
W. VFC: Variable-frequency controller.
1.3
SUBMITTALS
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A. In addition to the requirements of this section, submit shop drawings and descriptive data in
accordance with Division 1 and Section 26 05 00.
B. Product Data: For each type of motor controller and each type of MCC, include the following:
1. Shipping and operating weights.
2. Shipping splits.
3. Dimensioned plans and elevation diagrams.
4. Enclosure type and construction material.
5. Electrical ratings; Voltage, Current, and KAIC rating.
6. Conductor lug size ratings.
7. Conduit entry locations.
8. Schematic wiring diagrams showing power, signal, and control wiring for each installed
controller.
9. Factory installed devices.
10. Nameplate legends.
11. Furnished specialties and accessories.
12. System and operating description.
13. Parts list.
14. Local sources of supply and service.
C. Manufacturers Installation Instructions:
1. Include with shipment.
D. Spare Parts:
1. Provide a list of recommended spare parts with unit prices.
2. Provide with the Operation and Maintenance Manual.
E. Coordination Drawings:
1. Provide floor plans, drawn to scale, showing dimensioned layout, required working
clearances, and required area above and around equipment where pipe and ducts are
prohibited.
a. Show support locations, type of support, and weight on each support. Indicate field
measurements.
2. Show dimensions of house keeping pad.
F. Operation and Maintenance Manual:
1. Shall meet the requirements of Division 1 and Section 26 05 00.
2. Operating instructions for equipment.
3. Wiring and installation instructions for equipment.
4. Settings, adjustments, and calibrations for equipment as required.
5. Recommended maintenance schedules and procedures for equipment.
6. Equipment manufacturer’s name, address, and telephone number.
7. Load-Current and Overload-Relay Heater List: Compile after motors have been installed,
and arrange to demonstrate that selection of heaters suits actual motor nameplate fullload currents.
8. Load-Current and List of Settings of Adjustable Overload Relays: Compile after motors
have been installed, and arrange to demonstrate that switch settings for motor running
overload protection suit actual motors to be protected.
9. Sample of special warranty offered by Manufacturer, Supplier or Contractor, if any.
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1.4
QUALITY ASSURANCE
A. Source Limitations: Obtain controllers of a single type from single source from single
manufacturer.
B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by
a qualified testing agency, and marked for intended location and application.
C. Comply with NFPA 70.
1.5
COORDINATION
A. Coordinate sizes and locations of concrete bases and housekeeping pads.
B. Coordinate features of equipment, installed units, and accessory devices with remote pilot
devices and control circuits to which they connect.
C. Coordinate features, accessories, and functions of each controller, and each installed unit with
ratings and characteristics of supply circuits, motors, required control sequences, and duty
cycle of motors and loads.
D. Contractor shall verify that the equipment being furnished can be installed in the available
space. If available space is not adequate for the proposed equipment, Contractor shall notify
the Engineer before releasing the equipment for manufacturing. Contractor shall be
responsible for correcting equipment spacing conflicts which were not identified and
coordinated with Engineer prior to releasing the equipment for manufacturing.
PART 2 PRODUCTS
2.1
MOTOR STARTERS
A. General Characteristics:
1. Contactors manufactured to NEMA or IEC standards.
2. Fault current withstand rating equivalent to rating of horizontal main bus.
3. Line plug-in, pull-out, lock-out type.
a. Provide guides in structure for supporting and aligning starter during removal or
replacement.
b. Tin-plated, pressure-type high strength copper stab assembly for connection to
vertical bus.
c. Lock-out latch to padlock unit in “pull-out” position and isolate entire unit from bus.
4. Coil:
a. 120 volts, 60 HZ.
b. Molded construction.
5. Control power transformer mounted in each starter operating at other than 120V singlephase.
a. Size transformer with an extra 50VA capacity.
b. Two primary fuses, and a single secondary fuse.
c. Where the control voltage is used for motor protection circuits, the control power
circuit shall be run through an auxiliary contact on the motor’s local disconnect device
to discontinue control power when the disconnect switch is in the open position.
6. Provide lugs between contactor and overload relays for connection of power factor
correction capacitors.
7. Auxiliary Contacts:
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a. Minimum of 2 N.O. field convertible auxiliary contacts per starter.
b. Minimum of 1 N.O. field convertible auxiliary contact per overload relay.
c. Minimum of 1 N.O. field convertible auxiliary contact per cubicle breaker/disconnect.
8. Features:
a. Provide control devices, relays and contacts to perform the operations as specified in
the Contract Documents.
b. At a minimum provide the following on the enclosure door, unless specified otherwise
in the contract documents:
1) HAND-OFF-AUTO (HOA) selector switch
2) Run (green) pilot light.
3) Fail (red) pilot light.
4) Required (amber) pilot light.
5) Run time meter.
B. Overload Relay:
1. NEMA ICS; three-phase bimetal with external manual reset.
2. Class protection as recommend by the manufacturer of the motor it is protecting.
3. Coordinate size with actual motor full load current.
C. Combination Full-Voltage Non-Reversing (FVNR) and Reversing (FVR) Magnetic Motor
Starters:
1. Full voltage, across the line, electrically held.
2. Comply with NEMA ICS 2, general purpose, Class A.
3. Line-voltage, magnetic starter with overload element and lockable motor circuit protector
installed in common plug-in unit for control of induction motors.
4. Motor circuit protector breaker with lockable handle.
D. Combination Reduced-Voltage Non-Reversing (RVNR) Magnetic Controllers:
1. Reduced voltage, electrically held.
2. Comply with NEMA ICS 2, general purpose, Class A.
3. Closed transition; adjustable time delay on transition.
4. Magnetic starter with overload elements and lockable motor circuit protector installed in
common plug-in unit for control of induction motors.
5. Configuration:
a. Wye-Delta Controller: Four contactors, with a three-phase starting resistor/reactor
bank.
b. Part-Winding Controller: Separate START and RUN contactors, field-selectable for
one-half or two-thirds winding start mode, with either six- or nine-lead motors; with
separate overload relays for starting and running sequences.
c. Autotransformer Reduced-Voltage Controller: Medium-duty service, with integral
overtemperature protection; taps for starting at 50, 65, and 80 percent of line voltage;
two START and one RUN contactors.
E. Multispeed Magnetic Controllers:
1. Comply with NEMA ICS 2, general purpose, Class A.
2. Two speed, full voltage, across the line, electrically held. Compelling relay to ensure that
motor will start only at low speed.
3. Magnetic starter with overload elements and lockable motor circuit protector installed in
common plug-in unit for control of induction motors.
4. Configuration:
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a. Compelling relays shall ensure that motor starts only at low speed.
b. Accelerating timer relays shall ensure properly timed acceleration through speeds
lower than that selected.
c. Decelerating timer relays shall ensure automatically timed deceleration through each
speed.
d. Antiplugging timer relays shall ensure a time delay when transferring from FORWARD
to REVERSE and back.
F. Disconnecting Means and OCPDs:
1. MCP Disconnecting Means:
a. UL 489, NEMA AB 1, and NEMA AB 3, with interrupting capacity to comply with
available fault currents, instantaneous-only circuit breaker with front-mounted, fieldadjustable, short-circuit trip coordinated with motor locked-rotor amperes.
b. Lockable Handle: Accepts three padlocks and interlocks with cover in closed position.
c. Auxiliary contacts "a" and "b" arranged to activate with MCP handle.
d. Auxiliary contact that operates only when MCP has tripped.
e. Current-limiting module to increase controller short-circuit current (withstand) rating
to 100 kA.
2. MCCB Disconnecting Means:
a. UL 489, NEMA AB 1, and NEMA AB 3, with interrupting capacity to comply with
available fault currents; thermal-magnetic MCCB, with inverse time-current element
for low-level overloads and instantaneous magnetic trip element for short circuits.
b. Front-mounted, adjustable magnetic trip setting for circuit-breaker frame sizes 250 A
and larger.
c. Lockable Handle: Accepts three padlocks and interlocks with cover in closed position.
d. Auxiliary contacts "a" and "b" arranged to activate with MCCB handle.
e. Auxiliary contact that operates only when MCCB has tripped.
2.2
WALL MOUNTED MAGENTIC STARTERS
A. Shall be in accordance with applicable requirements of the Motor Starters paragraph above.
B. Provide combination type with non-fusible disconnect switch, unless noted otherwise.
C. NEMA rated enclosure:
1. Interior in conditioned space: NEMA 1 or NEMA 12.
2. Outside, near a water source, or unconditioned space: NEMA 3R
a. Provide bolt-on hub kit(s) for conduit connections in order to maintain NEMA 3R
rating.
3. Pool equipment rooms: NEMA 4X non-metallic switch enclosure for all pool equipment.
4. Corrosive areas: NEMA 4X 316 stainless steel, unless noted otherwise.
5. Class 1, Division 1, or 2 hazardous locations: NEMA 7 and listed as "Raintight".
D. UL Listed.
E. Manufacturer:
1. Allen-Bradley.
2. Cutler-Hammer.
3. Square-D.
4. Or Equal.
2.3
MANUAL MOTOR STARTERS
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A. Manual starters shall be provided to control and protect 120 volt, single phase motors. They
are identified on the Drawings as “MS.”
B. Starters shall be 120 volt, single pole with overload heater sized for the motor nameplate
current.
C. Starter shall be mounted in a 2-gang FD box with single gang openings.
D. Cover:
1. ON-OFF operator cover.
2. Non-corrosive area.
a. Appleton FSK-1VS, Crouse-Hinds DS199, or equal;
3. Corrosive area:
a. Non-metallic enclosure, toggle lever operator, and threaded hubs.
b. Crouse Hinds NFSC2, or equal.
E. Manufacturer:
1. General Electric CR101Y.
2. Cutler-Hammer MS.
3. Square D FG5.
4. Or equal.
PART 3 EXECUTION
3.1
EXAMINATION
A. Examine areas and surfaces to receive equipment with Installer present, for compliance with
requirements for installation tolerances, and other conditions affecting performance of the
Work.
B. Coordinate layout and installation of equipment with other construction including conduit,
piping, equipment, and adjacent surfaces. Maintain required workspace clearances and
required clearances for equipment access doors and panels.
C. Examine enclosures before installation. Reject enclosures which are wet, moisture damaged,
or mold damaged.
D. Proceed with installation only after unsatisfactory conditions have been corrected.
3.2
GENERAL INSTALLATION REQUIREMENTS
A. Install equipment in accordance with the NEC, as shown on the Contract Documents, and as
recommended by the manufacturer.
B. Install fuses if not factory installed.
C. Install equipment in accordance with manufacturer’s instructions.
D. Remove temporary lifting eyes, channels, and brackets and temporary blocking of moving
parts from enclosures and components.
E. Set field-adjustable switches, auxiliary relays, time-delay relays, timers, and electronic
overload relay pickup and trip ranges.
F. Adjust trip settings of circuit breakers and motor circuit protectors with adjustable
instantaneous trip elements. Initially adjust at six times the motor nameplate full-load
ampere ratings and attempt to start motors several times, allowing for motor cooldown
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between starts. If tripping occurs on motor inrush, adjust settings in increments until motors
start without tripping. Do not exceed eight times the motor full-load amperes (or 11 times for
NEMA Premium Efficiency motors if required). Where these maximum settings do not allow
starting of a motor, notify Engineer before increasing settings.
G. Install wiring between equipment and remote devices as specified and as required for the
control specified in other sections.
H. Bundle, train, and support wiring in enclosures.
I.
Manual motor starters shall be mounted near the equipment they serve where shown on the
Drawings.
J.
Connections and equipment settings shall be made to provide the operation specified in other
specifications, including but not limited to Divisions 22 and 23.
K. Program equipment for required operational sequences, status indications, alarms, event
recording, and display features.
L. After the equipment has been energized, an authorized service person with knowledge of the
supplied controller, motor, and project control equipment shall perform the following:
1. Make all final settings and parameter adjustments.
2. Adjust controls and signals.
3.3
FREE STANDING EQUIPMENT INSTALLATION
A. Anchor motor control centers with rustproof bolts, nuts, and washers not less than 1/2 inch
diameter, in accordance with manufacturer’s instructions, and as shown on drawings.
B. Install equipment level and plumb.
C. Interior Location. Mount motor control centers on concrete slab. Unless otherwise indicated,
the slab shall be at least 4 inches thick. The top of the concrete slab shall be approximately 4
inches above finished floor. Edges above floor shall have 1/2 inch chamfer. The slab shall be of
adequate size to project at least 8 inches beyond the equipment. Provide conduit turnups and
cable entrance space required by the equipment to be mounted. Seal voids around conduit
openings in slab with water- and oil-resistant caulking or sealant. Cut off and bush conduits 3
inches above slab surface. Concrete work shall be as specified in Section 03 30 00, CAST-INPLACE CONCRETE.
3.4
OVERLOAD PROTECTION
A. Before any motor is energized, Contractor shall obtain the nameplate information from the
motor supplier. Nameplate current of all motors shall be recorded on the line diagrams in a
space identified as "FLA_____."
B. Overload relays shall be checked for correct class and setting in accordance with motor
manufacturer’s recommendations. Class 10 overload relays shall be provided, unless motor
manufacturer specifies otherwise.
C. Motor overload settings shall be in accordance with the starter manufacturer's
recommendation for the given motor nameplate current, service factor and power factor
correction capacitors, if provided. Contractor shall be responsible for all damage that results
from improper overload protection.
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D. Adjust overload relay heaters or settings if power factor correction capacitors are connected
to the load side of the overload relays.
3.5
FIELD QUALITY CONTROL
A. Engage a representative or Contractor personnel trained on the provided equipment to
inspect, test, and adjust components, assemblies, and equipment installations, including
connections.
B. Tests and Inspections:
1. Inspect controllers, wiring, components, connections, and equipment installation.
2. Test and adjust controllers, components, and equipment.
3. Test continuity of each circuit.
4. Verify that voltages at controller locations are within 10 percent of motor nameplate
rated voltages. If outside this range for any motor, notify Construction Manager and
Owner before starting the motor(s).
5. Test each motor for proper phase rotation.
6. Correct malfunctioning units on-site, where possible, and retest to demonstrate
compliance; otherwise, replace with new units and retest.
7. Test and adjust controls, remote monitoring, and safeties. Replace damaged and
malfunctioning controls and equipment.
8. Mark up a set of manufacturer's drawings with all field modifications incorporated during
construction and return to manufacturer for inclusion in Record Drawings.
C. Enclosed controllers will be considered defective if they do not pass tests and inspections.
D. Each controller shall be operated at rated load. Duration of the load test shall be as directed
by the Engineer or Owner and as determined by the operating conditions of the installation.
E. Each unit with adjustable parameters shall be set to provide sufficient starting torque for the
pump/motor to begin rotation when it is called for.
F. Clear events memory after final acceptance testing and prior to Substantial Completion.
G. Prepare test and inspection reports, including a signed report that identifies enclosed
controllers and that describes testing results. Include notation of deficiencies detected,
remedial action taken and observations after remedial action.
3.6
DEMONSTRATION
A. Upon completion of acceptance checks, settings, and tests, the Contractor shall demonstrate
that the equipment is in good operating condition and properly performing the intended
function.
3.7
TRAINING
A. Furnish the services of a competent technician for a 2-hour period, minimum, to instruct
Owner personnel in operation and maintenance of the equipment, including review of the
operation and maintenance manual, on a date requested by the Owner.
3.8
IDENTIFICATION
A. Identify field-installed conductors, interconnecting wiring, and components.
B. Provide warning signs as required by the NEC and where noted in the specifications.
C. Label MCC and each cubicle with engraved nameplate.
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D. Label each enclosure-mounted control and pilot device.
E. Mark up a set of manufacturer's connection wiring diagrams with field-assigned wiring
identifications and return to manufacturer for inclusion in Record Drawings.
END OF SECTION
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