US Motors U2P2DC Data Sheet

Download

Page 1

NIDEC MOTOR CORPORATION

8050 WEST FLORISSANT AVE. ST. LOUIS, MO 63136

DATE: 1/26/2021 P.O. NO.: FD15 Order/Line NO.: 23176 MN 100

TO:

Model Number: FD15 Catalog Number: U2P2DC

Unimount Pre. Eff. Config. CONF,MOTOR,UNIMOUNT PRE EFF

REVISIONS:

(NONE)

ALL DOCUMENTS HEREIN ARE CONSIDERED CERTIFIED BY NIDEC MOTOR CORPORATION.

THANK YOU FOR YOUR ORDER AND THE OPPORTUNITY TO SERVE YOU.

Features:

Horsepower .............. 00002.00 ~ KW: 1.492

Enclosure ............... TEFC

Poles ................... 04 ~ RPM: 1800

Frame Size .............. 145~TC

Phase/Frequency/Voltage.. 3~060~230/460-208 ~ Random Wound

Service Factor .......... 1.25

Insulation Class ........ Class "F" ~ Insulife 1000

Altitude In Feet (Max) .. 3300 Ft.(1000 M) Ambient In Degree C (Max) +40 C

Assembly Position ....... "F-1" Assembly Position

Efficiency Class ........ Premium Efficiency

Application ............. Unknown

Customer Part Number ....

Secondary Rating: 2 Horsepower ~ 50 Hertz ~ 190/380 Volts "AK" Dimension (Inches).. 4.500 Temperature Rise (Sine Wave): "B" Rise @ 1.0 SF (Resist)

Starting Method ......... Direct-On-Line Start

Duty Cycle .............. Continuous Duty

Efficiency Value ........ 86.5 % ~ Typical

Load Inertia (lb-ft2): NEMA ~ NEMA Inertia: 11.00 ~ 1.00 Number Of Starts Per Hour: NEMA

Motor Type Code ......... UTE

Rotor Inertia (LB-FT²) .122 LB-FT² Qty. of Bearings PE (Shaft) 1 Qty. of Bearings SE (OPP) 1 Bearing Number PE (Shaft) 6205-2Z-J/C3 Bearing Number SE (OPP) 6203-2Z-J/C3

Nidec trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office.

Page 2

NIDEC MOTOR CORPORATION

8050 WEST FLORISSANT AVE. ST. LOUIS, MO 63136

DATE: 1/26/2021 P.O. NO.: FD15 Order/Line NO.: 23176 MN 100

TO:

Model Number: FD15 Catalog Number: U2P2DC

Unimount Pre. Eff. Config. CONF,MOTOR,UNIMOUNT PRE EFF

REVISIONS:

(NONE)

ALL DOCUMENTS HEREIN ARE CONSIDERED CERTIFIED BY NIDEC MOTOR CORPORATION.

THANK YOU FOR YOUR ORDER AND THE OPPORTUNITY TO SERVE YOU.

Accessories:

Standard Leadtime: 8-9 WEEKS Est. Weight (lbs ea): 35 ~ F.O.B.: Monterrey, Mexico

USE THE DATA PROVIDED BELOW TO SELECT THE APPROPRIATE DIMENSION PRINT

Horsepower 2 Pole(s) 04 Voltage(s) 460-230-208 / 380-190 Frame Size 145TC Shaft U Diameter 0.875 Outlet Box AF 1.59 Outlet Box AA 0.75

Nidec trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office.

Page 3

EFFECTIVE:

24-MAR-14

SUPERSEDES:

NEW

HORIZONTAL MOTORS

TEFC

FRAME: 143, 145TC

BASIC TYPE: UT

PRINT:

07-3109

SHEET:

1 OF 1

45°

BF 4 HOLES

AA SIZE

CONDUIT

H 4 HOLES

ALL DIMENSIONS ARE IN INCHES AND MILLIMETERS

3,4

±.03

5.50 140

11.00 279

.13

2.13 54

4.28

109

UNITS

6.50

165

-.0005

.8750

22.225

2.75 70

FRAME

143TC

145TC

UNITS

UNITS BS

UNITS

6.50 165

.75

MIN

.13

±.03

4.00 102

5.00 127

13.13 334

6.13 156

.13

-.06

3.50 89

4.53

115

MAX

6.50

165

2.75 70

AF AJAH

1.59 40

3/8-16 X .75

TOLERANCES

FACE RUNOUT .004 TIR PERMISSIBLE ECCENTRICTY OF MOUNTING RABBET .004 TIR PERMISSIBLE SHAFT RUNOUT .002 TIR

+.05

.34

5.875

149.23

MIN

1.41 36

1. DIMENSIONS MAY VARY .25" DUE TO CASTING AND/OR FABRICATION VARIATIONS

2. LARGEST MOTOR WIDTH

3. ALL TAP HOLES ARE UNIFIED NATIONAL COARSE, RIGHT HAND THREAD

4. TAP SIZE AND BOLT PENETRATION ALLOWANCE

5. BASIC CONDUIT FITTING SIZE. HOLE OPENING ON THE SIDE OF THE CONDUIT BOX (REPRESENTED BY A DASHED CI RCLE) WILL ACCEPT A .50 BASIC CONDUIT FITTING

6. THE CONDUIT BOX MAY BE LOCATED ON EITHER SIDE OF THE MOTOR. THE CONDUIT OPENING(S) MAY BE LOCATED IN STEPS OF 180° REGARDLESS OF LOCATION. STANDARD LOCATION IS SHOWN WITH THE CONDUIT OPENING DOWN

7. TOLERANCES ARE SHOWN IN INCHES ONLY

8. FRAME REFERENCE; 7.75/143/145

1.75 44

-.003

4.500

114.30

.50

1.75 44

SQ KEY

.188

4.78

3.25 83

7.16 182

7.31 186

07-3109/-

Nidec Motor Corporation

St. Louis, Missouri

INFORMATION DISCLOSED ON THIS DOCUMENT

IS CONSIDERED PROPRIETARY AND SHALL NOT BE

REPRODUCED OR DISCLOSED WITHOUT WRITTEN

CONSENT OF NIDEC MOTOR CORPORATION

ISSUED BY

R. TIMMERMANN

APPROVED BY

M. CULLEN

IHP_DP_NMCA (MAR-2011) SOLIDEDGE

Page 4

CATALOG NUMBER: U2P2DC NAMEPLATE PART #: 422702-002

MODEL FD15 FR 145TC TYPE UTE ENCL TEFC

SHAFT

END BRG

6205-2Z-J/C3 - QTY 1

OPP

END BRG

6203-2Z-J/C3 - QTY 1

PH 3

MAX AMB

40 C

ID#

INSUL

CLASS

Asm.

Pos.

F1 DUTY CONT

HP 2 RPM 1750

VOLTS 460 230 208

AMPS

2.9 5.7 5.9

AMPS

3.4 6.7

SF 1.25 DESIGN B CODE M

NEMA NOM

EFFICIENCY

86.5

NOM

76.7 KiloWatt 1.5

GUARANTEED

EFFICIENCY

84.0

MAX

KVAR

1.2 HZ 60

HP 2 RPM 1430

VOLTS 380 190

AMPS

3.3 6.7

AMPS

SF 1.00 DESIGN B CODE J

NEMA NOM

EFFICIENCY

82.5

NOM

82.5

GUARANTEED

EFFICIENCY

80.0

MAX

KVAR

1 HZ 50

HAZARDOUS LOCATION DATA (IF APPLICABLE):

DIVISION CLASS I GROUP I

TEMP CODE CLASS II GROUP II

VFD DATA (IF APPLICABLE):

VOLTS AMPS

TORQUE 1 TORQUE 2

VFD LOAD TYPE 1 VFD LOAD TYPE 2 VFD HERTZ RANGE 1 VFD HERTZ RANGE 2 VFD SPEED RANGE 1 VFD SPEED RANGE 2

SERVICE FACTOR FL SLIP

NO. POLES 4 MAGNETIZING AMPS 1.7

VECTOR MAX RPM Encoder PPR

Radians / Seconds Encoder Volts

TEAO DATA (IF APPLICABLE):

HP (AIR OVER)

HP (AIR OVER

M/S)

RPM (AIR

OVER)

RPM (AIR OVER

M/S)

FPM AIR

VELOCITY

FPM AIR

VELOCITY M/S

FPM AIR

VELOCITY SEC

Page 5

ADDITIONAL NAMEPLATE DATA:

Decal / Plate WD=344136 Customer PN

Notes Non Rev Ratchet

Max Temp Rise 80C RISE/RES@1.00SF OPP/Upper Oil Cap GREASE

Thermal (WDG) SHAFT/Lower Oil Cap GREASE

Altitude Usable At

Regulatory Notes Regulatory Compliance CC 030A

COS Marine Duty

Balance Arctic Duty

3/4 Load Eff. 86.4 Inrush Limit

Motor Weight (LBS) 35 Direction of Rotation

Sound Level Special Note 1

Vertical Thrust (LBS) Special Note 2

Thrust Percentage Special Note 3

Bearing Life Special Note 4

Starting Method Special Note 5

Number of Starts Special Note 6

200/208V 60Hz Max Amps 7.3 SH Max. Temp.

190V 50 hz Max Amps 6.7 SH Voltage

380V 50 Hz Max Amps 3.3 SH Watts

NEMA Inertia Load Inertia

Sumpheater Voltage Sumpheater Wattage

Special Accessory Note 1 Special Accessory Note 16

Special Accessory Note 2 Special Accessory Note 17

Special Accessory Note 3 Special Accessory Note 18

Special Accessory Note 4 Special Accessory Note 19

Special Accessory Note 5 Special Accessory Note 20

Special Accessory Note 6 Special Accessory Note 21

Special Accessory Note 7 Special Accessory Note 22

Special Accessory Note 8 Special Accessory Note 23

Special Accessory Note 9 Special Accessory Note 24

Special Accessory Note 10 Special Accessory Note 25

Special Accessory Note 11 Special Accessory Note 26

Special Accessory Note 12 Special Accessory Note 27

Special Accessory Note 13 Special Accessory Note 28

Special Accessory Note 14 Special Accessory Note 29

Special Accessory Note 15 Special Accessory Note 30

Heater in C/B Voltage Heater in C/B Watts

Zone 2 Group Division 2 Service Factor

Note 1 Note 2

Note 3 Note 4

Note 5 Note 6

Note 7 Note 8

Note 9 Note 10

Note 11 Note 12

Note 13 Note 14

Note 15 Note 16

Note 17 Note 18

Note 19 Note 20

Note 21 Note 22

NIDEC MOTOR CORPORATION

ST. LOUIS, MO

TYPICAL NAMEPLATE DATA

ACTUAL MOTOR NAMEPLATE LAYOUT MAY VARY

SOME FIELDS MAY BE OMITTED

Nidec trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office.

Page 6

MODEL NO. CATALOG NO. PHASE TYPE FRAME

FD15 U2P2DC 3 UTE 145TC

ORDER NO. 23176 LINE NO.

MPI: 143290 143291 143292 143293 143294 HP: 2 2 2 2 2 POLES: 4 4 4 4 4 VOLTS: 460 230 208 380 190 HZ: 60 60 60 50 50 SERVICE FACTOR: 1.15 1.15 1 1 1 EFFICIENCY (%):

S.F. 85.9 85.9

FULL 85.5 85.5 85.5 83.5 83.5

3/4 86.4 86.4 86.6 85.4 85.4 1/2 84.2 84.2 85.4 85 85 1/4 75.9 75.9 78.6 78.5 78.5

POWER FACTOR (%):

S.F. 80.1 80.1

FULL 76.7 76.7 81.8 82.5 82.5

3/4 68.3 68.3 75 75.3 75.3 1/2 54.8 54.8 62.7 62.4 62.4 1/4 34.7 34.7 41.1 39.8 39.8

NO LOAD 7.5 7.5 8 7.5 7.5

LOCKED ROTOR 66.6 66.6 65.2 71.6 71.6

AMPS:

S.F. 3.1 6.3

FULL 2.9 5.7 5.9 3.3 6.7

3/4 2.4 4.8 4.8 2.6 5.3 1/2 2 4.1 3.9 2.1 4.3 1/4 1.8 3.6 3.2 1.8 3.6

NO LOAD 1.7 3.5 3 1.7 3.4

LOCKED ROTOR 25.3 51 45 22.6 45 NEMA CODE LETTER M M K J J NEMA DESIGN LETTER B B B B B FULL LOAD RPM 1750 1750 1735 1430 1430 NEMA NOMINAL / EFFICIENCY (%) 86.5 85.5 85.5 83.5 83.5 GUARANTEED EFFICIENCY (%) 84 82.5 82.5 80 80 MAX KVAR 1.2 1.2 0.9 1 1 AMBIENT (°C) 40 40 40 40 40 ALTITUDE (FASL) 3300 3300 3300 3300 3300 SAFE STALL TIME-HOT (SEC) 10 10 13 12 12 SOUND PRESSURE (DBA @ 1M) 54 54 54 50 50 TORQUES:

BREAKDOWN{% F.L.} 478 478 382 356 356

LOCKED ROTOR{% F.L.} 368 368 289 290 290

FULL LOAD{LB-FT} 6 6 6.1 7.4 7.4

NEMA Nominal and Guaranteed Efficiencies are up to 3,300 feet above sea level and 25 ° C ambient

The Above Data Is Typical, Sinewave Power Unless Noted Otherwise

NIDEC MOTOR CORPORATION

ST. LOUIS, MO

Nidec trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office.

Page 7

Motor Wiring Diagram

9 Lead, Dual Voltage (WYE Conn.)

B109144

Y - Connection

Hi - VoltsLo - Volts

789

1 1223

Line

45645

789

B109144

To reverse direction of rotation interchange connections L1 and L2.

In such case each cable will be marked with the appropriate lead number.

Connection Plate: B109144 Connection Decal: 344136

Each lead may have one or more cables comprising that lead.

Page 8

FRAMES - 56 THRU B145

UNIMOUNT TOTALLY ENCLOSED MOTORS

TYPES: FUT, FUTF, FUTF4, UT, UT1, UT4, UTE, UTE1, UTE4, UTEF, UTEN, , UTEF1, UTEF4, UTF, UTF1, UTF4, UTFI,

UTFI4, UTFN, UTI, UTN, UTNI, UTQ, UTV, UTVE

THIS PARTS LIST IS GOOD FOR THE FOLLOWING TYPES:

Types Frames

UT, FUT

56, 56C 143T, TC, TD, TCZ 145T, TC, TD, TCZ B145T, TC, TD

UT-1 143, 145, B145JP

UT-4

143, 145, B145JM

Types Frames

UTE, UTQ 143, 145, B145T

UTF

56C, 143TC, TD 145TC, TD

UTN 143, 145T

UTV 143, 145TCV, JMV, JPV

UTFN 56C

WARNING: Any disassembly or repair work on explosionproof motors will void the Underwriters Laboratories, Inc. label unless done by the manufacturer, or a facility approved by the Underwriters Laboratories, Inc. Refer to your nearest sales office for assistance.

BEARINGS: Refer to motor nameplate for the bearing numbers.

PRICES: Parts stocking distributors: refer to renewal parts numerical index. All Others: refer to your nearest parts distributor.

reference: Renewal Parts Section 700, Pages 12 & 13

Page 9

FRAMES - 56 THRU B145

UNIMOUNT TOTALLY ENCLOSED MOTORS

TYPES: FUT, FUTF, FUTF4, UT, UT1, UT4, UTE, UTE1, UTE4, UTEF, UTEN, , UTEF1, UTEF4, UTF, UTF1, UTF4, UTFI,

UTFI4, UTFN, UTI, UTN, UTNI, UTQ, UTV, UTVE

ITEM

NO. QTY NAME OF PART

1 1 Fan Cover (not used on types UTN & UTFN)

2 3

Self Tapping Screw & Lockwasher (not used on types UTN & UTFN)

3 1

Fan (fan assembly on types UTE, 3600 RPM and UTQ) (not used on types UTN & UTFN)

4 1

Retaining Snap Ring (not used on UTE, 3600 RPM and UTN, UTQ and UTFN)

5 1 Bracket

6 4 Round Head Machine Screw

7 4 Bushing

8 4 Plastic Plug

9 1 Bracket Plug (used on types UTN & UTFN only)

10 1 Spring Wave Washer (not on type UTV)

11 1 Ball Bearing

12 1 Rotor Assembly (includes item 12 & 13)

13 1 Rotor Core

14 1 Shaft

15-19 - Not Used

20 1 Wound Stator Assembly (includes items 21 and 22 if used)

21 1 Mounting Base (not used on types UTF, UTV, UTFN)

22 6

Hex Head Cap Screw (not used on types UTF, UTV, and UTFN)

23 1 Gasket

24 1 Outlet Box Base

25 2 Self Tapping Screw

26 1 Gasket

27 1 Outlet Box Cover

28 2 Self Tapping Screw

29-34 - Not Used

35 1 Ball Bearing

36 1

Retaining Snap Ring (not used on frames 56 and 56C, also types UTN and UTQ)

37 1 Bracket

ITEM

NO. QTY NAME OF PART

38 4 Hex Nut

39 1 Square Key

40-49 - Not Used

For Types UT, UTF, UTV and UTFN with "C" bracket, and types UT-1 and

UT-4 omit items 37, 38 and item 10 on frames 143, 145, and B145

50 1 "C" Bracket

51 1 Clamping Plate (not used on frame 56C)

52 2

Hex Head Cap Screw (not used on frames 143, 145, & B145)

53 2 Not Used

For types UT and UTF with "D" bracket, omit items 10, 37, and 38, and add

the following parts

60 1 "D" Bracket

61 1 Bearing Cap

62 2 Hex Head Cap Screw

63-69 - Not Used

For type UTV and units with canopy cap, add the following parts

70 1 Canopy Cap

71 1 Spacer

72 1 Hex Head Cap Screw and Lockwasher

73 1 Square Nut

74-79 - Not Used

For SHUR-STOP bakes, omit items 1, 3 and 4, and refer to section 770 for

part addition

For Dings and Stearns brake, omit items 1, 2, and 5, and add the following

80 1

Brake (for replacement parts for brake, refer to the brake manufacturer)

81 2 Socket Head Cap Screw

82 1 Key

83 1 Bracket Mounting Bracket

84 3 Round Head Machine Screw abd Lockwasher

85 1 Bracket

BEARINGS: Refer to motor nameplate for the bearing numbers.

PRICES: Parts stocking distributors: refer to renewal parts numerical index. All Others: refer to your nearest parts distributor.

reference: Renewal Parts Section 700, Pages 12 & 13

Page 10

General Information for Integral Horsepower (IHP) Motors on Variable Frequency Drives (VFDs)

Variable Frequency Drives (VFD)

A VFD is a type of controller used to vary the speed of an electric motor.

The VFD takes a xed AC voltage and frequency and allows it to be

adjusted in order to get different speeds from the motor. Motor speed can be varied by changing the frequency of the input power waveform. The equation below shows how the frequency affects the speed of a three phase induction motor.

• VFD dv/dt - winding end turn differential in voltage versus differential in time

• High temperatures or high humidity

• Grouding system

Wider speed ranges, higher voltages, higher switching frequencies,

insufcient grounding and increased cable lengths all add to the severity

of the application and, therefore, the potential for premature motor failure.

120* Fundamental Input Frequency

Speed =

Number of Motor Poles

How does a VFD work?

A VFD takes the xed frequency and voltage sine wave from the power

grid or power station and puts it through a few steps in order to allow the VFD user to vary the frequency and in turn control the motor speed.

First it recties the AC power into DC Power. Because of this step, a

term commonly used instead of VFD is inverter. This only describes one

step of what the VFD does to the power waveform. Once rectied into

a DC voltage the drive sends the power through a set of transistors or switches. These switches can take the DC waveform and by opening and closing at certain speeds and durations can create an output waveform that mimics the sine wave that is required to drive a three phase electric motor. The output wave form is known as a Pulse Width Modulation (PWM) waveform because the waveform is created by multiple pulses of the switches at short intervals.

PULSE WIDTH MODULATION WAVEFORM

Line

Neutral Voltage

Line

Current

Figure 1 PWM Waveform

What variables should be considered when deciding whether to power a motor with a VFD?

VFD compatibility with motors is complex. As a result, many variables must be considered when determining the suitability of a particular motor for use with a VFD. These variables include:

• Torque requirements (Constant or Variable)

• Speed Range

• Line / System Voltage

• Cable length between the VFD and the motor

• Drive switching (carrier) frequency

• Motor construction

*This information applies only to Integral Horsepower (IHP) motors as dened on the Agency Approval page, under UL®† & CSA®† listings where indicated.

How does a VFD affect the motor?

There are many things to consider when a motor is powered using a VFD or PWM power. When a motor is powered by a PWM waveform the motor windings very often see a large differential voltage, either from phase to phase or turn to turn. When the voltage differential becomes large enough it creates a reaction at the molecular level that converts available oxygen into O3. This phenomenon is called partial discharge or corona. This reaction creates energy in the form of light and heat. This energy has a corrosive effect on the varnish used to protect the motor windings. PWM waveforms can also magnify shaft voltages which lead to arcing across the bearing and causing premature bearing failure. Corrective action must be taken to mitigate these issues that arise when using an electric motor with a VFD.

How do I protect the motor?

Nidec Motor Corporation (NMC) has developed specic motor designs

to decrease the harmful affects that a VFD can have on a motor. NMC’s INVERTER GRADE® insulation system is the rst line of defense against corona and phase to phase faults that can be common when a motor is powered using a PWM waveform. The INVERTER GRADE® insulation system is standard on all of NMC’s Inverter Duty products. Along with the INVERTER GRADE are installed as a minimum protection against over heating the motor. Special consideration must also be given to bearings in motors powered by VFD’s. In order to create a low resistance path to ground for built up shaft voltages a shaft grounding device can be used. On larger horsepower motors an insulated bearing system should be used in conjunction with the shaft grounding device when installed, to force the stray shaft voltages to ground. The bearing failures are more prominent on motors with thrust handling bearings. NMC has created an Inverter Duty vertical motor line that not only uses the INVERTER GRADE insulation system, but that also comes standard with a shaft grounding device. On motors that are 100 HP and greater the thrust bearing is also insulated for additional protection.

insulation, thermostats

What does "Inverter Duty" mean?

An Inverter Duty motor should describe a motor that helps mitigate potential failure modes of a motor that is powered by a VFD. Inverter duty motor windings should be able to withstand the voltage spikes per NEMA MG1 Part 31.4.4.2 and protect against overheating when the motor is run at slow speeds. On thrust handling bearings it is apparent that the bearings require additional protection. Inverter Duty vertical motors should have a shaft grounding device to protect the motor

bearings from uting due to voltage discharge through the bearing. On

larger motors (100HP and larger) the shaft should also be electrically isolated from the frame in order to aid the shaft grounding ring in discharging the shaft voltages to ground.

vii www.usmotors.com

Page 11

Motor / Inverter Compatibility

Thermal Overloads and Single Phase Motors

Motors with thermal overloads installed may not operate properly on a VFD. The current carrying thermal overload is designed for sine wave power. Operation on a VFD may cause nuisance tripping or potentially not protect the motor as would be expected on line power. Thermostats or thermistors installed in the motor and connected properly to the VFD may provide suitable thermal overload protection when operating on a VFD. (consult codes for installation requirements)

Single phase motors and other fractional horsepower ratings are not designed to be operated on a VFD. Within Nidec Motor Corporation standard products, all motors NEMA 48 frame (5.5” diameter) and smaller are not suitable for VFD applications. Three phase 56 and 143/145 frame applications should be noted on the catalog price page; or if in doubt ask a Nidec Motor Corporation technical representative for recommendations on compatibility with a VFD.

Slow Speed Motors

Motors with a base design of slower than six poles require special consideration regarding VFD sizing and minimizing harmonic distortion created at the motor terminals due to

cable installation characteristics. Additional external PWM waveform lters and shielded

motor cables designed for PWM power may be required to provide acceptable motor life. Harmonic distortion on the output waveform should be kept to a minimum level (less than 10%) mismatch impedance.

690V Applications

Motors that are rated for 690VAC and that will be powered by 690VAC PWM VFDs require

the use of an external lter to limit peak voltage spikes and the use of an INVERTER GRADE® motor. Where available, an alternative to using an output lter is to upgrade to a

2300V insulation system.

Low Voltage TITAN® Motors

When using 449 frame and larger motors on PWM type VFDs consider the use of an

external lter and shielded motor cables designed for PWM power to minimize harmonic

distortion and peak voltages at the motor terminals. Harmonic distortion on the output waveform should be kept to a minimum level (less than 10%).

Bearing Currents Related to PWM Waveforms

Protection of the motor bearings from shaft currents caused by common mode voltages

is becoming a standard feature on Inverter Duty motor products. Some installations may

be prone to a voltage discharge condition through the motor bearings called Electrical

Discharge Machining (EDM) or uting. Vertical HOLLOSHAFT and HOSTILE DUTY World

Motor come with grounding devices installed as standard. EDM damage is related to characteristics of the PWM waveform, and the VFD programming, and installations factors.

Bearing Protection on Inverter Duty Vertical Motors All U.S. MOTORS® brand “Inverter Duty” vertical products have a shaft grounding system

that allows damaging shaft currents a low resistance path to ground. Bearings on vertical motors fed by VFD power without this bearing protection are not covered under any warranty. All other bearing failure is covered per NMC’s standard warranty. An electric

motor repair shop approved to service U.S. MOTORS® brand motors must verify that the

cause of the bearing failure was not due to EDM damage.

Guideline For Insulated Anti-Friction Bearings

Bearing insulation is required to prevent circulating shaft currents which can damage bearings. Circulating shaft current can be caused by use of improper power and/or ground cables, improper grounding systems and higher switching frequencies. Finding and correcting the external condition(s) is the responsibility of the system designer or specifying engineer. To prevent circulating shaft current in motors with anti-friction bearings, Nidec Motor Corporation’s standard practice is to insulate the non-drive end bearing.

Adjustable Speed Drives produce a common mode voltage condition. To interrupt common mode voltage on induction motors of all sizes, NEMA MG1-2018 Part 31 recommends

insulating both bearings. In cases where both anti-friction bearings are insulated, the

system designer or specifying engineer should determine whether to apply one or more

of the following options to prevent or reduce shaft currents: sinewave lters, line reactors

or mechanical devices, such as shaft grounding or an insulated half coupling. Motors with shaft grounding devices are not suitable for installation in hazardous locations unless housed in an enclosure suitable for the specied Division (or Zone), Class and Group(s).

Multiple Motors on a Single VFD

Special considerations are required when multiple motors are powered from a single VFD unit. Most VFD manufacturers can provide guidelines for proper motor thermal considerations and starting/stopping of motors. Cable runs from the VFD and each motor can create conditions that will cause extra stress on the motor winding. Filters may be required at the motor to provide maximum motor life.

Grounding and Cable Installation Guidelines

®†

Proper output winding and grounding practices can be instrumental in minimizing motor related failures caused by PWM waveform characteristics and installation factors. VFD manufacturers typically provide detailed guidelines on the proper grounding of the motor to the VFD and output cable routing. Cabling manufacturers provide recommended cable types for PWM installations and critical information concerning output wiring impedance and capacitance to ground.

Integrated Motor and Inverter

By integrating the motor and inverter at NMC’s manufacturing facility, many of the motor compatibility problems are minimized or eliminated. During the manufacturing process, the motor is matched to the inverter characteristics which ensures the winding temperature

and torque levels meet the design specication. Since the inverter output wiring to the

motor is nearly eliminated, bearing currents are rarely experienced. When the unit is properly grounded, reducing the output cable lengths in conjunction with an inverter grade insulation system and low factory setting of the switching frequency of the inverter drive, results in low risk of voltage peaks produced by the PWM waveform.

Vertical Motors on VFDs

Vertical motors operated on VFD power present unique conditions that may require consideration by the user or installation engineer:

• Locked rotor and drive tripping caused by non-reversing-ratchet operation at low motor speeds. It is not recommended to operate motors at less than 1/4 of synchronous speed. If slow speeds are required contact NMC engineering.

• Unexpected / unacceptable system vibration and or noise levels caused by the

torque pulsation characteristics of the PWM waveform, a system critical frequency falling inside the variable speed range of the process or the added harmonic content of the PWM waveform exciting a system component

• Application related problems related to the controlled acceleration/deceleration and torque of the motor on VFD power and the building of system pressure/ load.

• The impact the reduction of pump speed has on the down thrust reected to the

pump motor and any minimum thrust requirements of the motor bearings

• Water hammer during shutdown damaging the non-reversing ratchet

Humidity and Non-operational Conditions

The possible build-up of condensation inside the motor due to storage in an uncontrolled environment or non-operational periods in an installation, can lead to an increased rate of premature winding or bearing failures when combined with the stresses associated with PWM waveform characteristics. Moisture and condensation in and on the motor winding over time can provide tracking paths to ground, lower the resistance of the motor winding

to ground, and lower the Corona Inception Voltage (CIV) level of the winding.

Proper storage and maintenance guidelines are important to minimize the potential of premature failures. Space heaters or trickle voltage heating methods are the common methods for drying out a winding that has low resistance readings. Damage caused by

these factors are not covered by the limited warranty provided for the motor unless appropriate heating methods are properly utilized during non-operational periods and prior to motor start-up.

NEMA®† Application Guide for AC Adjustable Speed Drive Systems: http://www. nema.org/stds/acadjustable.cfm#download

* This information applies only to Integral Horsepower (IHP) motors as dened on the Agency Approval page, under UL®† & CSA®† listings where indicated.

www.usmotors.com viii

Page 12

Warranty Guidelines for Integral Horsepower (IHP)* Motors on Variable Frequency Drives

Warranty Guidelines

The information in the following section refers to the motor and drive application guidelines and limitations for warranty.

• On TITAN® frame motors, inquiry required for suitability on constant torque loads.

Cable distances are for reference only and can be further limited by

hot and humid environments (refer to Table 1). Refer to specic VFD

Hazardous Location Motors

Use of a variable frequency drive with the motors in this catalog, intended for use in hazardous locations, is only approved for Division1, Class I,

Group D hazardous location motors with a T2B temperature code, with

a limitation of 2:1 constant torque or 10:1 variable torque output. No

Switching Frequency 460 Volt 230 Volt 380 Volt

other stock hazardous location motors are inherently suitable for operation with a variable frequency drive. If other requirements are

needed, including non-listed Division 2, please contact your Nidec Motor Corporation territory manager to conduct an engineering inquiry.

575 Volt Motors

575 volt motors can be applied on Inverters when output lters are used. Contact the drive manufacturer for lter selection and installation

requirements.

Applying INVERTER GRADE® Insulated Motors on

manufacturers cable limits. Refer to the Motor/ Inverter Compatibility page for special consideration of vertical motor bearings.

Variable Frequency Drives (2, 4, 6 pole)

The products within this catalog labeled “Inverter Duty” or “Vector Duty” are considered INVERTER GRADE

GRADE

motors exceed the NEMA®† MG-1 Part 31 standard.

Nidec Motor Corporation provides a three-year limited warranty on all

®†

NEMA

frame INVERTER GRADE® insulated motors and allows long

insulated motors. INVERTER

cable runs between the motor and the VFD (limited to 400 feet without

Warranty Period Clarications and Exceptions

Standard Energy Efcient Exclusion

Applying Standard & Energy Efcient Motors on Variable Frequency Drives is not recommended. VFD related failures on standard and energy efcient

motors will not be covered under warranty.

output lters). Cable distance can be further limited by hot and humid

environments and VFD manufacturers cable limits. These motors may be appropriate for certain severe inverter applications or when the factors

relating to the end use application are undened (such as spares).

Vertical Motor Windings

Premium efcient vertical motors without INVERTER GRADE

that are installed using the criteria described in this document and applied in the correct applications shall have a warranty while powered by a VFD for

Nidec Motor Corporation’s U.S. Motors INVERTER GRADE

insulated motors:

brand is available in the following

• Inverter Duty NEMA®† frame motors good for 20:1 Variable Torque & 5:1 Constant Torque, including Vertical Type RUSI (10:1 V.T.)

• Inverter Duty motors rated for 20:1 Constant Torque

• ACCU-Torq® and Vector Duty Motors with full torque to 0 Speed or 5000:1

• 841 Plus® NEMA®† Frame Motors

12 months from date of installation or 18 months from date of manufacturing

whichever comes rst. See limited warranty page for horizontal motor

warranty periods.

Bearing Exclusion for Thrust Handling Bearings

Bearings used in premium efcienct vertical motors, and all thrust handling

bearings, that are powered by VFDs without shaft grounding devices or insulated bearings (when required) will not be covered under any warranty for damages caused from being powered by a VFD. All other bearing failure is covered per NMC’s standard warranty. An electric motor repair shop approved to service U.S. MOTORS of the bearing failure was not due to Electrical Discharge Machining.

Table 1 - Cable Distances

Maximum Cable Distance VFD to Motor

3 Khz 127 ft 400 ft 218 ft

6 Khz 90 ft 307 ft 154 ft

9 Khz 73 ft 251 ft 126 ft

12 Khz 64 ft 217 ft 109 ft

15 Khz 57 ft 194 ft 98 ft

20 Khz 49 ft 168 ft 85 ft

insulation

brand motors must verify that the cause

Applying Premium Efcient motors (that do not have INVERTER

GRADE

Premium efcient motors without INVERTER GRADE insulation meet

minimum NEMA

insulation) on Variable Frequency Drives (2, 4, 6 pole)

®†

MG-1, Section IV, Part 31.4.4.2. These motors can be used with Variable Frequency Drives (with a reduced warranty period) under the following parameters:

• On NEMA®† frame 447 and smaller motors, 20:1 speed rating on variable torque loads & 4:1 speed range on constant torque loads.

• On TITAN® 449 and larger frame motors, 10:1 speed rating on variable torque loads.

* This information applies only to Integral Horsepower (IHP) motors as dened on the Agency Approval page, under UL®† & CSA

Medium Voltage and Slow Speed Considerations

Motors that are rated above 700 VAC or that are eight pole and slower require special consideration and installation and are not covered under the warranty guidelines in this document. Motors that are rated above 700VAC

have special cable length and voltage differential issues that are specic

to the VFD type and manufacture. The motor construction and cost may vary dramatically depending on the VFD topology and construction. Contact your NMC representative with VFD manufacturer name and model type for application and motor construction considerations. Motors that are designed

eight pole and slower also require special installation and lters per the drive

manufacturer.

®†

listings where indicated.

US Motors U2P2DC Data Sheet

Specifications and Main Features

Frequently Asked Questions

User Manual