Attachment A.pdf

EFFECTIVE:

SUPERSEDES:

PRINT:

SHEET:

02-JUL-18

NEW

1200-5-94DIMENSION PRINT

TEFC, VERTICALLY MOUNTED

FRAME: 280VPA

BASIC TYPE: CTV

HAZARDOUS LOCATION DATA (IF APPLICABLE):

VFD DATA (IF APPLICABLE):

TEAO DATA (IF APPLICABLE):

ADDITIONAL NAMEPLATE DATA:

NIDEC MOTOR CORPORATION

MODEL NO. CATALOG NO. PHASE TYPE FRAME

ORDER NO. LINE NO.

Connection Plate: 499495 Connection Decal: 912113

499495

Motor Wiring Diagram

23 DELTA

Connection

ST. LOUIS, MISSOURI 8/7/2018

TORSIONAL ANALYSIS DATA

ORDER NO: 18701924-100

FRAME SIZE 284VPA-40

SHAFT DATA

DRAWING NO. MATERIAL DENSITY YIELD

2031094 AISI 1040 –1045 HR .283 LBS/IN3 45,000 psi

TENSILE YOUNG’S MODULUS SHEAR MODULUS

82,000 psi 30 x106 psi 12 x 106 psi

MOMENT OF INERTIA - ROTOR ASSEMBLY:

WR2 = 5.07 LB-FT2

SHAFT TORSIONAL STIFFNESS:

3.9797 X 105 LB-IN/RADIAN

Torsional stiffness is the spring rate or constant which allows a user to determine the amount of twist or angular deflection in a shaft based on the amount of torque applied. The portion of the shaft for which the shaft stiffness has been calculated from 1/3 the length of the rotor core to the end of the drive end of the shaft (shafts with an annular keyways are measured from inboard side of the ring groove). It is the users responsibility to correct for coupling mounting effects.

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I vii

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

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.

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.

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

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

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

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.

to decrease the harmful affects that a VFD can have on a motor.

NMC’s INVERTER GRADE® 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® insulation, thermostats 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.

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 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.

®† & CSA®† listings where indicated.

Figure 1 PWM Waveform

Speed = 120* Fundamental Input Frequency

Number of Motor Poles to

Current usmotors.com viii

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 an Nidec Motor Corporation technical representative for recommendations on compatibility with a VFD.

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.

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 impedence.

Motors that are rated for 690VAC and that will be powered by 690VAC spikes and the use of an INVERTER GRADE® motor. Where available, system.

When using 449 frame and larger motors on PWM type VFDs consider 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%).

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

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.

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.

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.

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.

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.

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 the motor bearings

• Water hammer during shutdown damaging the non-reversing ratchet

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.

®† & CSA®† listings where indicated.

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

Cable distances are for reference only and can be further limited by manufacturers cable limits. Refer to the Motor/ Inverter Compatibility page for special consideration of vertical motor bearings.

motors will not be covered under warranty.

® insulation 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 12 months from date of installation or 18 months from date of manufacturing warranty periods.

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® brand motors must verify that the cause of the bearing failure was not due to Electrical Discharge Machining.

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 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 manufacturer.

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

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, a limitation of 2:1 constant torque or 10:1 variable torque output.

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

requirements.

The products within this catalog labeled “Inverter Duty” or “Vector Duty” are considered INVERTER GRADE® insulated motors. INVERTER 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 cable runs between the motor and the VFD (limited to 400 feet without environments and VFD manufacturers cable limits. These motors may be appropriate for certain severe inverter applications or when the factors

Nidec Motor Corporation’s U.S. Motors® brand is available in the following INVERTER GRADE® insulated motors:

• 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 minimum NEMA®† 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.

Table 1 - Cable Distances

Maximum Cable Distance VFD to Motor

Switching Frequency 460 Volt 230 Volt 380 Volt

127 ft 400 ft 218 ft

90 ft 307 ft 154 ft

73 ft 251 ft 126 ft

64 ft 217 ft 109 ft

57 ft 194 ft 98 ft

49 ft 168 ft 85 ft

®† & CSA®† listings where indicated.