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MOTOR NAMEPLATE DATA
FRAME
An alphanumeric designation of the size of a motor. These designations
are standardized in the USA by the National Electrical Manufacturers
Association (NEMA). For standard NEMA frames140 and larger, the first
two numbers are four times the height of the center of the motor shaft
above the feet. The third and fourth (if used) numbers indicate the distance
between the mounting holes on the feet lengthwise, but a table is
necessary to find the actual distance.
MODEL
The MODEL number of the "F" series motors is a description of how the
motor is put together. The model number describes the windings and
connections as well as frame size, configuration, and options.
HP
The rated output horsepower of the motor is listed in the HP block. This
value of horsepower is only valid at base speed, or above base speed, if
the drive is equipped to operate in extended speed range.
RPM
The base speed of the motor, the speed at which rated horsepower is
developed. From zero to this speed is the CONSTANT TORQUE
speed range. If there are two numbers in this block with a slash between
them, the first number is the base speed and the second number is the top
speed. Between these two speeds is the CONSTANT HORSEPOWER
range.
BUS VDC
For a Brushless DC motor, this is the voltage level of the DC supply
from which the drive operates the motor. In most cases, this value is the
nominal capacitor bank voltage level, which is about 1.4 times the RMS
value of the AC input to the drive.
DUTY
This is a rating which may limit how the motor is used. If the designation
CONT is in this block, the motor may be used for continuous duty up to
its full ratings. A 30 MIN rating in the DUTY block indicates that the motor
may be run to its full rating for 30 minutes, after which it must cool to
ambient temperature.
RMS AMPS
This is the per phase motor current (in RMS AC amperes) required to
develop full load torque on a motor that has reached its steady state
operating temperature.
S.F.
The SERVICE FACTOR is a multiplier to the HP, indicating how much
power may be used under rated conditions.
© copy right 2012 by P O WE R TEC Industrial Motors, Inc
POW ERTEC "F" Series Motor Manual
INSUL. CL.
INSULATION CLASS "F" is rated for 105°C rise above an ambient
temperature of 40°C. Class "H" is rated for 125°C rise. The motor over-
temperature protector is set to correspond.
AMB
°C
The AMBIENT TEMPERATURE in which the motor operates should not
exceed this number.
ENCL
This is the type of enclosure of the motor. In Europe, it is called the
PROTECTION CLASS. There are two basic types: OPEN and
CLOSED. See "MOTOR ENCLOSURES" on page 6 for a description
of the standard NEMA motor enclosures.
C.T. SPD. RANGE
This is the ratio of speeds, based on BASE SPEED, over which the
motor may be operated at full torque continuously. This is a THERMAL
limitation. This does not guarantee smooth operation, only that the motor is
able to cool itself at full torque over this range.
CONNECTION
This is either 1-D or 2-D, 1-Y or2-Y. (D = delta; Y = wye) This refers to
the connection of the windings. See "Motor Winding Connections" for
details on the connections.
PEAK RMS AMPS
Do not exceed this value at any time. This is the maximum safe current
which will not affect the permanent magnets.
INTEGRAL ENCODER
This number is the pulses per revolution (PPR) which will be seen in
one channel of the speed feedback (HS4 or HS5) from the internal
encoder. The two channels are 90° out of phase with each other, i.e.,
they are in QUADRATURE. For small motors the number should
be 30. Large motors should be 60.
KE
V/KRPM
This is the RMS voltage which should be observed between any two
power leads of the motor at 1000 RPM. This measurement is taken with
the windings at room temperature (25 °C). Actual voltage at operating
temperature may be as low as 90% of the 25 °C value.
SERIAL NO.
Use when calling to ask questions or to order spare parts. This number is
also stamped into the frame near the junction box.
JOB NO.
This is a factory in-house number for the factory build job that included this
motor.
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