Provide all watertight electrical equipment, including motors, controllers, and master switches
210 with drain plugs installed at the lowest point of the enclosure. Fit motors and control enclosures located in the weather with heaters to prevent condensation and ensure operation in a -8°F ambient temperature.
Select motor controllers shall be installed at centralized motor control centers (MCCs) in lieu of individual controllers as shown in Reference (3E). All motor controllers shall be of the
215 combination type.
Provide complete motor control wiring diagrams on the interior of all MCC cabinets and free standing motor controllers. This includes OEM controllers supplied with and/or integral to the equipment.
302.2 Motors
220
Motors shall be NEMA premium efficiency motors. Exceptions are permitted for special electrical equipment and small fractional horsepower motors. Deviations shall be approved by the Owner's Representative. Motors located in machinery rooms shall be rated for 50°C (122°F) ambient temperature.
Unless noted otherwise, motors shall be squirrel cage induction type. Three phase motors shall
225 be NEMA Design B unless the characteristics of the driven machine require otherwise.
Generally, motors shall be totally enclosed fan cooled (TEFC), but shall be totally enclosed air over (TEAO) for in-line ventilation fan use. Motors for pumps are to have the drive end entirely enclosed or designed to prevent leakage from entering the motor. Motors in damp locations such as the Weather Decks and unheated areas shall have the windings encapsulated in epoxy resins.
230 Motors used in variable speed applications shall be inverter duty motors. All motor selections shall be approved by the Owner's Representative.
Motors shall be from a single United States manufacturer, except as specifically approved by the Owner's Representative. Exceptions are special electrical equipment and small fractional
horsepower units or motors provided as integral parts of equipment.
235
Install motors in locations high enough to avoid bilge water. Where motors are installed in interior spaces, they shall be located in dry locations and as far as practical from water and oil piping.
Each motor shall be fitted with a nameplate of corrosion-resistant materials. Motors shall be designated as hostile environment motors having a 1.15 service factor, Class F insulation or
240 better and an epoxy coating on the case.
All motors shall be equipped with pre-lubricated, factory-sealed bearings of suitable design to take the required axial and radial loads. Motors shall be equipped so that in-service greasing will not be necessary except during the manufacturer recommended overhaul periods.
Motors of two horsepower and larger shall be suitable for operation on 480 VAC, 3-phase
245 power, unless shown otherwise in Reference (3C). Single phase motors, where employed, shall be high starting torque and shall operate satisfactorily on 240 or 120 VAC power. Motors above 50 hp shall be provided with reduced voltage type motor controllers.
Motor controllers shall be provided per Reference (3C).
Each motor shall be fitted with a nameplate of corrosion resistant material marked permanently
250 with the following information:
Manufacturer's type and frame
designation Rated horsepower
Rating classification Design ambient temperature Temperature rise at rated load Rpm at rated load
Voltage Amperes at rated load
Number of phases Frequency
Code for locked rotor KVA on motors 1/2 hp and larger in
accordance with NEMA standards
Bar Code for Asset Identification
The Contractor shall provide a motor data booklet to the Owner's Representative upon delivery of the vessel. The booklets shall list all electric motors throughout the vessel. The booklet shall contain the following information:
Complete nameplate data Location of each motor on the vessel Motor service and circuit number Manufacturer's name, address, local
representative
302.3 Motor Controllers
255
Motor controllers shall be marine type, complying with the requirements of the UL Standard for Industrial Control Equipment, or IEC equivalent, and USCG 46 CFR Subchapter J. Controllers shall be manufactured by Square D or equal. Motor controllers not provided as parts of
integrated machinery packages shall be from the same manufacturer.
Controller enclosures shall be USCG approved. Hardware exposed to the weather, dampness or
260 corrosive environments shall be stainless steel, grade 316 or better. Provide filters in the air intake where panels are force ventilated. Controllers installed in interior locations shall have
NEMA 12 enclosures. Controllers located in areas accessible to the public shall have locking devices similar to and keyed to match the panel boards.
Provide contactors with as many auxiliary contacts as required for each control, alarm and
265 monitoring function.
Mount operating controls in the front of the enclosure. Provide power available lights, and illuminated pushbuttons for motor running indication. Provide push-to-test pilot lights. Run indicator lights shall be green for single speed motors; amber for low speed and green for high speed in the case of two speed motors. Automatic controllers shall have blue indicator lights for
270 automatic control, and green for motor running on hand-off-auto (HOA) controllers. Indicator lights and controls shall operate at 120 V or less, and shall be powered from the controlled circuit. Provide control transformers as necessary.
Remote operating stations shall be provided where control from more than one location is required, where the motor starter cannot be located near the motor, or as required by the
275 Regulatory Bodies.
All motor controllers shall utilize appropriately rated contactors for the motor horsepower to be controlled. Starters shall have three-pole, external manual melting alloy type thermal overload devices, or have ambient compensated bi-metallic thermal overload relays.
Reduced voltage type controllers shall be required for motors over 50 hp to limit inrush current
280 to acceptable limits for the generator and to minimize voltage dip. Prepare voltage dip calculations to verify proper selection of controllers for the service intended and submit to Owner's Representative for approval.
Motor controllers with a working power rating of 1 hp or greater shall typically be provided with low voltage protection (LVP) to avoid excess starting currents when power is lost and then
re-285 established. Employ low voltage release (LVR) on motor controllers vital to the operation of the ship's propulsion, as shown on References Error! Reference source not found. and (3C) and other systems required by regulation.
Motor controllers shall be approved by the Owner's Representative. Single-phase fractional horsepower motors may use manual LVR effect controllers. Label each starter with the load
290 description and circuit number.
Reference (3C) shall be used as a guide for required motor controllers. Final quantities and types are the contractor’s responsibility, subject to approval by the Owner's Representative.
302.4 Variable Speed Drives
Variable speed motor controllers shall meet the requirement of the system load. Where variable
295 frequency drives (VFD) are specified, the VFD shall be supplied by the same vendor as the controlled motor assembly, and shall be programmed during system commissioning to provide for the flow (water or air) required for proper system operation during each mode of operation.
Local and remote control stations shall be provided with illuminated pushbuttons that select/indicate the mode of operation.
300
Label each VFD with the load description and circuit number.
Reference (3C) shall be used as a guide for required VFDs. Final quantities and types are the Contractor's responsibility, subject to approval by the Owner's Representative.
302.5 Motor Control Centers
Motor control centers (MCCs) shall be used to consolidate certain motor controllers as depicted
305 in References Error! Reference source not found. and (3C). MCCs shall provide electrical services to motor-driven rotating machinery operating on 3-phase, 3-wire ungrounded circuits supplied with a nominal voltage of 480 VAC. Each MCC branch circuit motor and motor control system shall provide stand-alone functionality. MCCs shall provide a means of disconnecting and locking out individual motor circuits at the motor control center. The
310 disconnect device is to indicate whether the device is open or closed.
Construct each MCC to meet the degree of protection suitable for the intended location. Design and construct the equipment to provide a dead front degree of construction. Unless otherwise approved by the Owner's Representative, front access for all serviceable components is required.
Service access from the rear shall be limited to maintenance of bus connections, circuit breaker
315 stab connections to field loads and making up ship's cable and shipping splits on installation as applicable.
MCCs shall be Square D or equal. Enough sections shall be provided at each MCC to house each motor controller shown in Reference (3C) with a 20% margin for future controller addition or two (2) additional sections, whichever is greater.
320
302.6 Fire/Ventilation Shutdown Circuit
Ventilation fans, fuel consuming machinery, and fuel oil pumps shall be provided with separately fused, remotely tripped motor controllers or under-voltage trip circuit breakers that will shut down upon interruption of the fire relay (FR) shutdown circuit (refer to Reference (3C)). Manual switches capable of interrupting the shutdown circuit shall be located in the Pilot
325 House and EOS. Each switch shall de-energize a control relay that will initiate the shutdown of the connected motors and machinery. Separate shut down circuits shall be provided for
accommodation ventilation and engine room ventilation. A red phenolic placard shall be provided adjacent to the switch labeled Fire Shutdown and provide reset procedures.
The shutdown switch for the Emergency Generator Room ventilation fans shall be located
330 immediately outside the space. The shutdown switch for fuel consuming machinery and fuel oil pumps shall be located at an open deck location on the Main Deck near the engine room clean agent release. The final locations shall be approved by the Owner's Representative.
303 CIRCUIT BREAKERS