Rockwell Automation 1329R Std. Industrial AC Induction Motors - Manual (Page 6)

6 Standard Industrial AC Induction Motors
Installation Inspection
After the motor is unpacked, examine the nameplate data to see that it
agrees with the power circuit to which it is to be connected. The
motor will operate with frequency not more than 5% and voltage not
more than 10% above or below the nameplate data, or combined
variation of voltage and frequency of not more than 10% above or be
low nameplate data. Efficiency, power factor and current may vary
from nameplate data. Performance within these voltage and
frequency variations will not necessarily be in accordance with the
standards established for operation at rated voltage and frequency.
Location
The motor should be installed in a location compatible with the motor
enclosure and specific ambient.
To allow adequate air flow, the following clearances must be
maintained between the motor and any obstruction:
TEFC (IC0141) Enclosures
Fan Cover Air Intake 180-210T Frame 25.4 mm (1.00 in.)
250-449T Frame 101.6 mm (4.00 in.)
IEC 112 - 132 25.0 mm (0.98 in.)
IEC 160 - 280 100.0 mm (3.94)
Exhaust Envelope equal to the “P” dimension on the motor dimension sheet
Protected Enclosures
Bracket Intake Same as TEFC
Frame Exhaust Exhaust out the sides-envelope a minimum of the “P” dimension plus
50.0 mm (1.97 in.). Exhaust out the end-same as intake.
Table B
General Effect of Voltage & Frequency Variation on Induction-motor Characteristics
NOTE: This table shows goneral effects, which will vary somewhat for specific ratings.
Variation
Starting &
Maximum
Running
Torque
Sync
Speed
Slip %
Full Load
Speed
Efficiency Power Factor/COS
Full
Load
Current
Starting
Current
Temperature
Rise
(full load) Maximum
Overload
Capacity
Magnetic
Noise
(no-load in
particular)
Full-Load 3/4 Load 1/2 Load Full Load 3/4 Load 1/2 Load
Voltage Variation:
120%
voltage Increase
44% No
change Decrease
30% Increase
1.5% 6-0%
Decrease
(1-75 HP)
0-3%
Increase
(100-200 HP) Decrease
1/2-2
points Decrease
7-20
points Decrease
5-15 points Decrease
10-30
points Decrease
15-40
points Increase
12% Increase
20% Increase 5-6
degrees C.
(1-75 HP)
Decrease 3-4
degrees C.
(100-200 HP) Increase
44% Noticeable
increase
110%
voltage Increase
21% No
change Decrease
17% Increase
1% Slight
decrease Practically
no change Decrease
1-2 points Decrease
5-10 points Decrease
5 points Decrease
5-6 points Increase
2-4% Increase
10-12% Increase 3-4
degrees C. Increase
21% Increase
slightly
Functions
of Voltage (voltage) 2 Constant 1
(voltage)
2
(sync
speed slip) voltage (voltage) 2
90%
Voltage Decrease
19% No
change Increase
23% Decrease
1-1/2% Decrease
2 points Practically
no change Increase
1-2 points Increase
5 points Increase
2-3 points Increase
4-5 points Increase
11% Decrease
10-12% Increase 6-7
degrees C. Decrease
19% Slight
decrease
Frequency Variation:
105%
frequency Decrease
10% Increase
5% Practically
no change Increase
5% Slight
increase Slight
increase Slight
increase Slight
increase Slight
increase Slight
increase Slight
decrease Decrease
5-6% Slight
decrease Slight
decrease Slight
decrease
Function of
frequency 1
(frequency) 2
Frequency (sync
speed slip) 1
frequency
95%
frequency Increase
11% Decrease
5% Practically
no change Decrease
5% Slight
decrease Slight
decrease Slight
decrease Slight
decrease Slight
decrease Slight
decrease Slight
increase Increase
5-6% Increase
slightly Increase
slightly Increase
slightly
1% phase
unbalance Slight
decrease Slight
decrease Slight
decrease 2%
decrease 5-6%
decrease 1-1/2%
increase Slight
decrease 2%
increase
2% phase
unbalance Slight
decrease Slight
decrease Slight
decrease 8%
decrease 7%
decrease 3%
increase Slight
decrease 8%
increase