The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
SECTION 26 2419
MOTOR CONTROL CENTERS
PART 1 - GENERAL
SUMMARY
1.1
A.
Section Includes:
1. Motor control centers.
2. Full-voltage non-reversing controllers.
3. Two-speed controllers.
4. Full-voltage reversing controllers.
5. Variable frequency controllers.
6. Fusible switch assemblies.
7. Molded case circuit breaker.
8. Transient voltage suppression devices.
9. Motor control center installation.
B.
Related Documents:
1. Applicable provisions of Division 00 – Procurement and Contracting
Requirements shall govern work of this specification section.
C.
Related Sections:
1. Applicable provisions of Division 01 - General Requirements shall govern work of
this specification section.
1. Applicable provisions of MWRDGC General and Detailed Technical
Specifications utilized for this project.
REFERENCES
1.2
A.
Institute of Electrical and Electronics Engineers (IEEE):
1. IEEE C62.41.1 - IEEE Guide on the Surge Environment in Low-Voltage (1000 V
and less) AC Power Circuits.
2. IEEE C2 National Electrical Safety Code.
B.
National Electrical Manufacturers Association (NEMA):
1. NEMA AB 1 - Molded Case Circuit Breakers and Molded Case Switches.
2. NEMA FU 1 - Low Voltage Cartridge Fuses.
3. NEMA ICS 2 - Industrial Control and Systems: Controllers, Contactors, and
Overload Relays, Rated Not More Than 2000 Volts AC or 750 Volts DC.
4. NEMA ICS 2.3 - Instructions for the Handling, Installation, Operation, and
Maintenance of Motor Control Centers.
5. NEMA ICS 3 - Industrial Control and Systems: Factory Built Assemblies.
6. NEMA ICS 5 - Industrial Control and Systems: Control Circuit and Pilot Devices.
7. NEMA ICS 7 - Industrial Control and Systems: Adjustable Speed Drives.
8. NEMA ICS 7.1 - Safety Standards for Construction and Guide for Selection,
Installation, and Operation of Adjustable Speed Drive Systems.
2012 EDITION
26 2419 - 1
MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
9. NEMA KS 1 - Enclosed and Miscellaneous Distribution Equipment Switches (600
Volts Maximum).
10. NEMA 250 Enclosures for Electrical Equipment (1000 Volts Maximum).
C.
International Electrical Testing Association (NETA):
1. NETA ATS - Acceptance Testing Specifications for Electrical Power Distribution
Equipment and Systems.
D.
Underwriters’ Laboratories, Inc. (UL):
1. UL 845 Motor Control Centers.
E.
National Electrical Code (NEC):
1. NEC Article 240.
2. NEC Article 430.94.
SUBMITTALS
1.3
A.
CLOSEOUT SUBMITTALS
1.4
A.
Section 01 7000 – Execution and Closeout Requirements: Requirements for closeout
submittals.
B.
Section 01 7839 - Project Record Documents: Record actual locations, configurations,
and ratings of motor control centers and major components.
C.
Section 01 7823 - Operation and Maintenance Manuals: Submit replacement parts list
for controllers.
QUALIFICATIONS
1.5
A.
1.6
Section 01 3300 - Submittal Procedures: Requirements for submittals.
1. Shop Drawings:
a. Indicate front and side views of enclosures with overall dimensions shown.
b. Conduit entrance locations and requirements.
c. Nameplate legends; size and number of bus bars for each phase, neutral and
ground; electrical characteristics including voltage, frame size and trip ratings,
withstand ratings, and time and current curves of equipment and components.
2. Product Data:
a. Submit electrical characteristics including voltage, frame size and trip ratings,
fault current withstand ratings, and time-current curves of equipment and
components.
3. Test Reports:
a. Indicate field test and inspection procedures and test results.
Manufacturer: Company specializing in manufacturing products specified in this
section with minimum five years certified experience.
DELIVERY, STORAGE, AND HANDLING
2012 EDITION
26 2419 - 2
MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
A.
Deliver, store and protect products under provisions of Section 01 6000 - Product
Requirements: Product storage and handling requirements.
B.
The manufacturer shall separate motor control center into shipping splits of up to 3
vertical sections. Ship splits vertically for easier handling at job site. Each shipping
split shall include lifting angle, or lifting tabs, for positioning equipment at job site.
C.
Store in clean, dry space. Maintain factory wrapping or provide additional canvas or
plastic cover to protect units from dirt, water, construction debris, and traffic.
D.
Handle in accordance with NEMA ICS 2.3. Lift only with lugs provided. Handle
carefully to avoid damage to motor control center components, enclosure, and finish.
ENVIRONMENTAL REQUIREMENTS
1.7
A.
Section 01 6000 - Product Requirements: Environmental conditions affecting products
on site.
B.
Conform to NEMA ICS 2 service conditions during and after installation of motor
control centers.
FIELD MEASUREMENTS
1.8
A.
Verify field measurements prior to fabrication.
PART 2 - PRODUCTS
MOTOR CONTROL CENTERS
2.1
A.
Manufacturers:
1. GE Electrical, 800 Series.
2. Siemens, Model 95.
3. Square D, Model 6.
4. Westinghouse, Model W.
5. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description: NEMA ICS 3, Class I, Type as specified in the Detailed
Specifications.
C.
Service Conditions: NEMA ICS 2.
D.
Temperature: 32 TO 104 degrees F.
E.
Altitude: 3300 feet.
F.
Main Overcurrent Protection: As specified in the Detailed Specifications.
G.
Feeder Tap Units: As specified in the Detailed Specifications.
2012 EDITION
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MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
H.
Voltage Rating: As specified in the Detailed Specifications.
I.
Horizontal Bus: Copper, with continuous current rating of 600 amperes. Include copper
ground bus entire length of control center.
J.
Vertical Bus: Copper.
K.
Integrated Equipment Short Circuit Rating: 65000 amperes RMS symmetrical at 480
volts.
L.
Configuration: Front and rear. Units front and rear mounting.
M.
Enclosure: NEMA ICS 6, Type 1, non-walk-in.
N.
Finish: Manufacturer's standard gray enamel.
FULL-VOLTAGE NON-REVERSING CONTROLLERS
2.2
A.
Manufacturers:
1. GE Electric, Model CR.
2. Siemens, Model CR.
3. Square D, Model C.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description: NEMA ICS 2, AC general-purpose Class A solid-state controller
for induction motors rated in horsepower.
C.
Control Voltage: 120 volts, 60 Hertz.
D.
Overload Relay: NEMA ICS 2; bimetal.
E.
Product Options and Features:
1. Auxiliary Contacts: NEMA ICS 2, 2, 2, each normally, open, closed, field
convertible contacts in addition to seal-in contact.
2. Cover Mounted Pilot Devices: NEMA ICS 5, standard type.
3. Pilot Device Contacts: NEMA ICS 5, Form Z, rated A150.
4. Pushbuttons: Recessed type.
5. Indicating Lights: LED neon type.
6. Selector Switches: Rotary type.
7. Relays: NEMA ICS 5.
8. Control Power Transformers: 120 volt secondary, 250 VA minimum, in each motor
controller. Furnish fused primary and secondary, and bond unfused leg of
secondary to enclosure.
TWO-SPEED CONTROLLERS
2.3
A.
Manufacturers:
1. BENSHAW, Model RB3.
2. ICM CONTROLS, Model CC750.
2012 EDITION
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MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
3. CENTERLINE, Model 2100.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description: NEMA ICS 2, AC general-purpose Class A solid-state controller
for induction motors rated in horsepower. Include integral time delay transition
between FAST and SLOW speeds.
C.
Control Voltage: 120 volts, 60 Hertz.
D.
Overload Relay: NEMA ICS 2; bimetal.
E.
Product Options and Features:
1. Auxiliary Contacts: NEMA ICS 2, 2 each normally open, and closed, field
convertible contacts in addition to seal-in contact.
2. Cover Mounted Pilot Devices: NEMA ICS 5, standard.
3. Pilot Device Contacts: NEMA ICS 5, Form Z, rated A150.
4. Pushbuttons: Recessed type.
5. Indicating Lights: LED neon type.
6. Selector Switches: Rotary type.
7. Relays: NEMA ICS 5.
8. Control Power Transformers: 120 volt secondary, 250 VA minimum, in each motor
controller as scheduled. Furnish fused primary and secondary, and bond unfused leg
of secondary to enclosure.
FULL-VOLTAGE REVERSING CONTROLLERS
2.4
A.
Manufacturers:
1. Centerline, Model 2100.
2. ABB Control, Model B16SR-1Q.
3. Allen Bradley, Model AXXSR.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description: NEMA ICS 2, solid-state controller for induction motors rated in
horsepower. Include electrical interlock and integral time delay transition between
FORWARD and REVERSE rotation.
C.
Control Voltage: 120 volts, 60 Hertz.
D.
Overload Relay: NEMA ICS 2; bimetal.
E.
Product Options and Features:
1. Auxiliary Contacts: NEMA ICS 2, 2 each normally open, and closed field
convertible contacts in addition to seal-in contact.
2. Cover Mounted Pilot Devices: NEMA ICS 5, standard type.
3. Pilot Device Contacts: NEMA ICS 5, Form Z, rated A150.
4. Pushbuttons: Recessed type.
5. Indicating Lights: LED neon type.
6. Selector Switches: Rotary type.
7. Relays: NEMA ICS 5.
2012 EDITION
26 2419 - 5
MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
8. Control Power Transformers: 120 Volt Secondary, 250 VA minimum, in each
motor controller. Provide fused primary and secondary, and bond unfused leg of
secondary to enclosure.
VARIABLE FREQUENCY CONTROLLERS
2.5
A.
Manufacturers:
1. Allen Bradley Model 22F.
2. Square D Model ADV-66.
3. Cutler Hammer Model M-Max.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description:
1. NEMA ICS 7, variable frequency controller suitable for operating loads as
indicated on Drawings.
2. Select unspecified features and options in accordance with NEMA ICS 7.1.
C.
Ratings:
1. Rated Input Voltage: As specified in the Detailed Specifications.
2. Motor Nameplate Voltage: As specified in the Detailed Specifications.
3. Displacement Power Factor: Between 1.0 and 0.95, lagging, over entire range of
operating speed and load.
4. Operating Ambient: 0 degrees C to 40 degrees C.
5. Minimum Efficiency at Full Load: 96 percent.
6. Time to Stop: As specified in the Detailed Specifications.
D.
Design Features:
1. Employ microprocessor-based inverter logic isolated from power circuits.
2. Employ pulse-width-modulated inverter system.
3. Design for ability to operate controller with motor disconnected from output.
4. Design to attempt five automatic restarts following fault condition before locking
out and requiring manual restart.
E.
Indicators and Manual Controls:
1. Input Signal: As specified in the Detailed Specifications.
2. Display: Furnish integral digital display to indicate output voltage, output
frequency, and output current.
3. Status Indicators: Separate indicators for overcurrent, overvoltage, ground fault,
overtemperature, and input power ON.
4. Volts Per Hertz Adjustment: Plus or minus 10 percent.
5. Current Limit Adjustment: 60 - 110 percent of rated.
6. Acceleration Rate Adjustment: 0.5 - 30 seconds.
7. Deceleration Rate Adjustment: 1 - 30 seconds.
8. HAND-OFF-AUTOMATIC selector switch and manual speed control.
9. Control Power Source: As specified in the Detailed Specifications.
F.
Safeties and Interlocks:
1. Includes undervoltage release.
2012 EDITION
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MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
2. Door Interlocks: Mechanical means to prevent opening of equipment with power
3.
4.
5.
6.
connected, or to disconnect power when door is opened; furnish means for
defeating interlock by qualified persons.
Safety Interlocks: Terminals for remote contact to inhibit starting under both
manual and automatic mode.
Control Interlocks: Provide terminals for remote contact to allow starting in
automatic mode.
Manual Bypass: Includes contactor, motor running overload protection, and short
circuit protection for full voltage, non-reversing operation of motor. Includes
isolation switch to allow maintenance of inverter during bypass operation.
Emergency Stop: Use friction brakes for emergency stop function.
FUSIBLE SWITCH ASSEMBLIES
2.6
A.
Manufacturers:
1. Simens, Model VB11.
2. GE, Model QMW.
3. Cutler Hammer, Model SKU.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description: NEMA KS 1, Type HD, load interrupter knife switch. Handle
lockable in OFF position.
C.
Fuse clips: Designed to accommodate NEMA FU 1, Class J fuses.
MOLDED CASE CIRCUIT BREAKER
2.7
A.
Manufacturers:
1. Siemens, Model FD.
2. GE, Model SFP.
3. Square D, Model J-Frame.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
B.
Product Description: NEMA AB 1, molded-case circuit breaker.
C.
Field-Adjustable Trip Circuit Breaker: As specified in the Detailed Specifications.
D.
Field-Changeable Ampere Rating Circuit Breaker: Circuit breakers with frame sizes
200 amperes and larger have changeable trip units.
TRANSIENT VOLTAGE SUPPRESSION DEVICES
2.8
A.
Manufacturers:
1. Haimen Taigang Tech., Model VA.
2. Taihang, Model VD.
3. YUAN GUAN, Model HYBRID.
4. Substitutions: In accordance with Section 01 2500 – Substitution Procedures.
2012 EDITION
26 2419 - 7
MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
B.
Product Description: IEEE C62.41, factory-mounted transient voltage surge suppressor,
selected to meet requirements for medium exposure and to coordinate with system
circuit voltage.
SOURCE QUALITY CONTROL
2.9
A.
Shop inspect and perform standard productions tests for each controller in accordance
with manufacturer's standards.
B.
Make completed motor control center available for inspection at manufacturer's factory
prior to packaging for shipment. Notify MWRDGC Engineer at least seven (7) days
before inspection is allowed.
C.
Allow witnessing of factory inspections and tests at manufacturer's test facility. Notify
MWRDGC Engineer at least seven (7) days before inspections and tests are scheduled.
PART 3 - EXECUTION
EXAMINATION
3.1
A.
Verify surfaces are suitable for motor control center installation.
EXISTING WORK
3.2
A.
Disconnect and remove abandoned motor control centers.
B.
Maintain access to existing motor control centers and other installations remaining
active and requiring access.
C.
Clean and repair existing motor control centers to remain or are to be reinstalled.
MOTOR CONTROL CENTER INSTALLATION
3.3
A.
Install in accordance with NEMA ICS 2.3 and NEMA 7.1.
B.
Tighten accessible bus connections and mechanical fasteners after placing motor
control center.
C.
Install fuses in fusible switches.
D.
Select and install heater elements in motor controllers to match installed motor
characteristics.
E.
Install engraved plastic nameplates in accordance with Section 26 0553 – Identification
for Electrical Systems.
F.
Neatly type label inside each motor controller door identifying motor served, nameplate
horsepower, full load amperes, code letter, service factor, voltage rating, and phase
rating. Place label in clear plastic holder.
2012 EDITION
26 2419 - 8
MOTOR CONTROL CENTERS
The Metropolitan Water Reclamation District of Greater Chicago
General Specifications
G.
Ground and bond motor control centers in accordance with Section 26 0526 –
Grounding Bonding for Electrical Systems.
FIELD QUALITY CONTROL
3.4
A.
Section 01 4000 - Quality Requirements: Field inspecting, testing, adjusting, and
balancing.
B.
Inspect and test in accordance with NETA ATS, except Section 4.
C.
Perform inspections and tests listed in NETA ATS, Section 7.16.
D.
Inspect and test variable frequency controllers according to NEMA ICS 7.1.
END OF SECTION
2012 EDITION
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MOTOR CONTROL CENTERS