Installation, Inspection, Location – Rockwell Automation 1329R Std. Industrial AC Induction Motors User Manual

Page 6: Inspection location

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)

Constant

1
(voltage)

(sync
speed slip)

voltage

(voltage)

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
decrease

Decrease
5-6%

Slight
decrease

Function of
frequency

(frequency)

Frequency

(sync
speed slip)

frequency

95%
frequency

Increase
11%

Decrease
5%

Practically
no change

Decrease
5%

Slight
decrease

Slight
increase

Increase
5-6%

Increase
slightly

1% phase
unbalance

Slight
decrease

2%
decrease

5-6%
decrease

1-1/2%
increase

Slight
decrease

2%
increase

2% phase
unbalance

Slight
decrease

8%
decrease

7%
decrease

3%
increase

Slight
decrease

8%
increase