MPS Master
SECTION 26 29 13
MOTOR CONTROLS
PART 1 - GENERAL
1.01 SUMMARY
A.Section Includes: All motor and equipment feeders, disconnect switches, starters, controls, and VFD connections. Motor and equipment locations and mounting heights are approximate and shall be coordinated with all trades.
1.Provide disconnects and starters indicated in Contract Documents.
2.Where specifically noted "Furnished By Others", provide required power and control connections.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A.Acceptable Manufacturers: All motor control devices shall be of same manufacturer. Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Allen-Bradley
2.Square D
2.02 COMBINATION UNITS
A.General Requirements: Where a disconnect switch is indicated at the same location as a magnetic starter, combination units shall be provided.
2.03 DISCONNECTING MEANS
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A.General Requirements: Provide all disconnect switches, feeder, and control connections as required.
B.Type:
1.3 phase disconnects shall be heavy duty fusible type, unless otherwise indicated.
2.Single phase disconnects shall be Bussman No.SSY or SSU type, complete with fuses.
3.Proper voltage and motor horsepower rated.
4.Electrically interlock all separately derived control circuits to disconnect switch.
5.Provide terminals suitable for both 60degreeC and 75degreeC conductors.
2.04 MAGNETIC STARTERS
A.General Requirements: Provide magnetic starters as indicated.
1.Solid state starters with bypass shall be used for polyphase constant speed motors, and shall be as manufactured by Allen Bradley, SMCFlex Series, unless noted otherwise.
2.Where starters are not required, provide installation and connect as required.
B.Type: Square D, Class 8536 or Allen Bradly, nonreversing type with all of the following features:
1.Full voltage, across-the-line, horsepower rated.
2.Terminals suitable for both 60 degree C and 75 degree C conductors.
3.Surface type NEMA rated enclosure for specific environment.
4.Motor running overcurrent protection in each ungrounded conductor. Provide overload heaters after verifying correct name plate overcurrent and overload ratings for each motor.
a.3 Phase Starters: Overload shall be hand-reset melting alloy type.
b.Single Phase Starters: Overloads shall be automatic reset type.
5.Low voltage release.
6.Holding coil of proper voltage. Each coil shall be 120 volt, except where control wiring is indicated in Motor Schedule as "Furnished By Others", in which case the coil voltage shall be as required by Mechanical Contractor.
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7.Control Transformer: Provide with same voltage as holding coil, within each magnetic starter enclosure. Transformer shall be complete with both primary and secondary fusing.
8.Hand-Off-Auto Selector Switch: Square D, Class 9999, No.SC2 or Allen Bradley, mounted on starter cover and connected in circuit such that protective devices remain in circuit in both auto and hand positions.
9.Pilot Light: Square D, Class 9999or Allen Bradleymounted on starter cover and shall be complete with red lens and lamp.
10.Auxiliary Contacts: Provide required normally open and normally closed auxiliary contacts indicated.
C.Phase Loss Protection: Provide each 3 phase magnetic starter with a phase protector to open starter upon loss of any phase, reversal of phases, a voltage unbalance or undervoltage condition. Phase protector shall be Allen-Bradley, No.813S, or Square D. Phase protector shall not be installed outdoors.
2.05 MANUAL STARTERS
A.General Requirements: Provide all manual starters listed except where noted on Motor Schedule, in which case provide installation and connect as required.
B.Type:
1.Full voltage, across-the-line, horsepower rated.
2.One motor running overcurrent protector in each ungrounded conductor.
3.In Finished Areas: Square D, Class 2510, or Allen Bradley, flush mounted, sized to fit standard outlet boxes. Include plates to match general device plate types. Include manufacturer's direction plate for resetting overloads. Plates shall be engraved as noted.
a.Manual starters with pilot lights and hand-off-auto switch shall be No.FS71P.
4.Where exposed conduit is permitted, provide Square D, Class 2510, or Allen Bradley in surface boxes.
a.Manual starters with pilot lights and hand-off-auto switch shall be No.FG71P.
5.Pilot lights with manual starters shall be red neon jewel type. Provide pilot lights connected to conductors at actual motor location to indicate motor is running.
2.06 CONTROL STATIONS
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A.General Requirements: Provide all control stations listed, except where noted on Motor Schedule, in which case provide installation and connect as required.
1.In finished areas, all control stations shall be flush mounted in standard outlet boxes, with plates to match general device plates.
B.Type: Control stations shall be as follows:
1.Push Button Stations: Square D, Class 9001, or Allen Bradley, maintained contact type for 2wire control of magnetic starters. Actuator buttons shall be engraved startstop.
a.No.BF308 where flush mounted.
b.No.BG310 where surface mounted.
2.Push Button Stations: Square D, Class 9001, or Allen Bradley for 3wire control of magnetic starters or relays. Engrave actuator buttons "start-stop".
a.No.BF308 where flush mounted.
b.No.BG310 where surface mounted.
3.Double Throw Center Off Switch: Switches shall be Hubbell HBL1385 (coordinate color with wiring devices) for 3wire control of magnetic starters.
4.Toggle Switch Stations: Standard toggle switches as specified under "Wiring Devices" shall be provided.
5.Pilot Lights: Provide incandescent type lights with red lens at start-stop stations. Pilot lights at the toggle switches shall be neon type mounted in separate gangs of device plates. Pilot lights shall be connected to conductors on load side of disconnect at motor in order to indicate that motor is running, not just that switch is in "On" position.
6.Special Key Switches: Each key switch, including special wall outlet boxes and engraved plates.
7.Duct Smoke Fire Detectors: Detectors shall be furnished and installed by Electrical Contractor and shall be connected into motor control circuits to shut indicated motor off when smoke is detected. (Detector stations are normally specified in other Specification Divisions.)
8.Motorized Dampers: Dampers shall be furnished and installed by Division 23, but connected by Electrical Contractor.
9.Engraving: Engrave remote motor control stations as required to identify station.
2.07 GFI RECEPTACLE AT MOTOR
A.General Requirements: Provide GFI receptacle, described in Section 262726, as follows:
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1.Weatherproof cover plate.
2.Located within 25 feet of rooftop unit.
3.Connect to closest unswitched receptacle circuit and not connected to unit power supply.
2.08 POWER FACTOR CORRECTION CAPACITORS AT MOTORS
A.General Requirements: Capacitors shall be 60 Hertz industrial grade (not motor run, oil field or pump type), meeting NEMA Standard CP-1. All capacitors shall be nonPCB, acceptable to environmental authorities. Provide the following features:
1.Fused disconnecting means properly sized for each capacitor.
2.Surface mounted, NEMA 1 enclosure.
3.Voltage and phase ratings as shown in Schedule for each motor. Capacitors rated 240 volts shall be used on 120, 208, and 230 volt motors. Capacitors rated 480 volts shall be used on 460 volt motors.
4.Capacitor shall be unit cell construction. No fuses or arcing devices shall be built into a cell.
5.Each capacitor shall be complete with fuses and indicating lamps. Fuses shall be fast acting, current limiting 600 volt midget type rated for 100,000 amps interrupting capacity. Each fuse shall be shunted with a neon lamp that will light when fuse is in open position. Lamps shall be visible and replaceable from outside capacitor enclosure.
6.Discharge resistors shall reduce residual voltage to 50 volts or less within 1minute of disconnecting capacitor from line. A delta connection (not open delta) of resistors shall be used on 3 phase capacitor cells, 1 to each cell.
7.Size capacitor per motor nameplate data.
B.Acceptable Manufacturers: Capacitors shall be Myron Zucker, Inc., "Calvault" power capacitor assembly or Owner approved equal in all respects of Cornell-Dubilier, General Electric, Sprague, or Westinghouse.
2.09 FIRE PUMP / JOCKEY PUMP INSTALLATIONS
A.General Requirements: Coordinate with mechanical trades to ensure all required working clearances and access are provided for fire pump and jockey pump controllers and all related equipment.
1.The following shall not be allowed within fire pump and jockey pump controllers:
a.Splices or taps.
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b.Wiring foreign to fire pump or jockey pump installation routed into or through controller cabinets.
2.Provide 4 (four) #14, 1/2inch conduit between fire pump controller and jockey pump controller to monitor jockey pump status by fire pump controller.
B.Remote Annunciator:
1.Provide 11/4inch 8#12 from controller to remote annunciator for status monitoring.
2.Provide 20 amp, 120 volt dedicated circuit to remote annunciator. Verify annunciator cabinet size and circuit requirements with Mechanical Contractor.
3.Provide generator start circuit from fire pump controller to generator ATS.
C.Building Fire Alarm System:
1.Provide addressable monitor modules for each of the following fire pump status items:
a.Pump Running
b.Loss of Phase of Either Normal Power or Generator Power Source
c.Phase Reversal (Supervised Circuit Not Greater Than 125 Volts)
d.Controller Connected to Alternate Power Source
e.Emergency Isolation Switch Off
f.Common Alarm Contact Status (Disk Full, Memory Board Battery Status; verify with Mechanical Contractor)
2.If fire pump controller is supplied with annunciator/status panel, there will be separate contacts provided by fire pump supplier to isolate remote status contacts from building fire alarm monitoring contacts.
D.Signage: Provide code required signage indicating locations of service disconnect switches at both electrical and fire pump rooms.
PART 3 - EXECUTION
3.01 MOTOR SCHEDULE
A.General Requirements: Coordinate all motors indicated with the specific requirements of each respective trade.
3.02 INSTALLATION OF DISCONNECTS AND STARTERS
A.General Requirements: Contractor shall provide disconnecting switches and starters shown in Motor Schedule. Disconnects and starters furnished by others shall be installed and connected by Contractor.
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B.Starters and Disconnect Locations: Coordinated onsite to clear other equipment; provide proper accessibility and ease of maintenance. Starters and disconnects shall be installed with clearances as required by the National Electric Code. Starters and disconnects shall be installed in locations that do not provide required clearances, only with the prior approval of both the Electrical Inspector and Architect/Engineer. (In general, starters and disconnects shall be located near motors, wall mounted not more than 6 feet above floor or mounted on equipment where readily accessible from floors.)When indicated to be installed above finished ceilings, starter and disconnect shall be located within 24 inches of ceiling for ease of maintenance.
C.Disconnect Switches at Elevator: Refer to Specification Section 26 28 16.
D.Starter Overloads: Electrical Contractor shall install proper running current protection, in each starter, based on actual motor nameplate readings and overload manufacturer's selection tables.
3.03 INSTALLATION OF VFDS
A.General Requirements: VFDs shall be as manufactured by Allen Bradley (Power-Flex 400 Series) or ABB ACH550 Series unless noted otherwise.
B.VFD Locations: Locations shall be coordinated onsite to clear other equipment; provide proper accessibility and ease of maintenance. VFDs shall be installed with clearances as required by the National Electric Code. VFDs shall be installed in locations that do not provide required clearances, only with the prior approval of both the Electrical Inspector and Architect/Engineer. (In general, VFDs shall be located near the motors, wall mounted not more than 6 feet above the floor or mounted on equipment where readily accessible from the floors.)When indicated to be installed above finished ceilings, VFD shall be located within 24 inches of ceiling for ease of maintenance.
C.Wiring: Line and load conductors shall be installed in separate conduits.
D.Fuses: Electrical Contractor shall install proper fuses, in each VFD, based on actual motor nameplate readings.
3.04 FIRE PUMP FEEDS
A.General Requirements: Provide feeder to fire pump controllers and equipment as follows:
1.Arrange feeder conduits for top feed into controller cabinet and bottom exit over to fire and jockey pump locations.
2.Feeders shall be in galvanized rigid steel conduit, terminated at motors with liquid tight flex.
3.Liquid tight flex raceway connections shall not exceed 6 feet.
4.Provide grounding/bonding connection from motor to controller within raceway system.
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3.05 FIRE PUMP HOUSE KEEPING PAD
A.General Requirements: Provide a 4inch housekeeping pad for all floor mounted controllers. Coordinate with Mechanical Contractor.
3.06 INSTALLATION OF CONTROLS
A.General Requirements: Provide all control wiring indicated, except where noted on Motor Schedule. Adequate auxiliary contacts and relays to accomplish interlocks and subsidiary control connections shall be provided as part of this Contract. Contractor shall also coordinate work with Mechanical and Temperature Control Contractors, such that operation of mechanical equipment will be as described in Mechanical Specifications.
B.Hand-Off-Auto Operation: Where equipment does not have automatic control, connect the hand-off-auto selector switch for manual operation with automatic position available for future use. Connections to selector switch shall be such that only normal automatic regulatory control devices will be bypassed when switch is in manual position; safety control devices, such as low or high-pressure cutouts, high temperature cutouts, and motor overload protective devices, shall be connected in motor-control circuit in both manual and automatic positions of the selector switch.
1.All automatically controlled starters shall be equipped with HAND-OFF-AUTO selector switches. H-O-A switches are to be connected in circuit such that any protective cutouts remain in the circuit in both AUTO and HAND positions.
3.07 INSTALLATION OF POWER FACTOR CORRECTION CAPACITORS
A.General Requirements: Where capacitors are shown in Motor Schedule, Electrical Contractor shall connect as required by equipment manufacturer. Where no prior requirements are called for, capacitor shall be connected as follows:
1.Capacitors shall be installed where feasible on top of control center and control cabinets, allowing space for removal of capacitor cover. Capacitors shall not be placed over hot equipment, but shall be provided with good ventilation and protection against excessive dirt and fluids.
2.Conductors to capacitors shall have ampacities at least 1.35 times the capacitor amperage rating.
3.Capacitors for motors, other than reversing, 2-speed or reduced voltage start types, shall be connected between motor starter and motor.
4.Capacitors for motors which are reversing, 2-speed, frequently started and stopped or reduced voltage started shall be connected between motor disconnect and motor starter.
3.08 MOTOR CONNECTIONS
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A.General Requirements: Flexible metal conduit shall be used for final connections to motors. Flexible conduit shall be not less than 12inches nor more than 24inches in length. Flexible metal conduit in boiler rooms, kitchens, and mechanical rooms shall be liquid tight type. Provide a separate grounding conductor within flexible conduit, bonded to conduit system, for motors.
B.Connections to Roof Mounted Motors: Motors shall be made in such a way that all conduit and wiring shall be covered by unit housing. Verify with unit installation Contractor.
C.Connections to Wall Hung Water Coolers: Install in accordance with cooler manufacturer's requirements. Conceal receptacle behind cooler enclosure at all units where possible.
3.09 LABELING AND ENGRAVING
A.Arc Flash Labels: Provide arc flash warning labels for all switchboards, panelboards, industrial control panels, and motor control centers to warn qualified persons of the danger of electric arc flash.
B.General Labeling: Labels inscribed with both the motor name and number shall be attached to each motor disconnect and to each motor starter or combination switch-starter. Each motor name shall be as shown in the "Equipment Served" column of Motor Schedule. (On projects where no Motor Schedule is provided, motor names shall be as directed by Engineer.)Labels shall be black micarta plastic laminate plates with 1/4inch high white cut letters. Labels shall be attached with screws.
C.Engraving: Remote motor control pushbutton stations, momentary contact stations or HandOff-Auto stations shall be identified. Flush plates shall be engraved with Sierra or equal permanent type filled letters. Surface mounted control stations shall have 1/4 inch high white cut letters on black micarta plates.
END OF SECTION
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