Echo Electric Motors

Reference Motor Guidelines for Belted Applica ons - con nued

1200 RPM

1800 RPM

3600 RPM

Belt Deflected

Belt Deflected

Belt Deflected

Motor HP

Minimum Sheave Dia. (in.)

Maximum # of Belts

Minimum Sheave Dia. (in.)

Maximum # of Belts

Minimum Sheave Dia. (in.)

Maximum # of Belts

Belt Type

Belt Type

Belt Type

Force (lbs.)

Force (lbs.)

Force (lbs.)

3/4

2.2 2.2 2.4 2.4 2.4 3.0 3.0 3.8 4.4 4.4 4.4 5.2 6.0 6.8 7.4 8.6 8.6

1 1 2 2 3 3 4 4 4 6 7 7 7 8 4 4 6 6 7 8 9

2.2 3.1 2.1 2.9 2.9 3.7 4.1 4.3 5.4 4.8 5.2 5.3 6.0 6.0

2.2 2.2 2.2 2.4 2.4 2.4 3.0 3.0 3.8 4.4 4.4

3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX

1 1 1 1 2 3 2 3 3 3 4

1.3 1.6 2.5 2.7 2.3 2.5 4.2 3.8 4.4 5.0 4.7

2.2 2.4 2.4 2.4 3.0 3.0 3.8 4.4 4.4 5.2 6.0 6.8 6.8 8.2 8.2

3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 5VX 5VX 5VX 5VX 5VX

1 1 2 3 2 3 4 4 5 6 7 7 4 4 5 5 6 7 7 8 6 7 7 8 8 9

3.4 4.0 3.1 2.8 2.9 4.0 4.7 5.4 5.4 6.0 5.6 6.0

3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 3VX 5VX 5VX 5VX

1

1-1/2

2 3 5

7-1/2

10 15 20 25 30 40 50 60 75

12.0 14.5 14.0 14.5 16.0 14.0 15.5 16.0 28.0 27.0 30.0 29.0 32.0 31.0

13.5 14.5 13.0 13.0 13.5 13.0 14.0

10.0 10.0 12.0 13.2 15.0 15.0 16.0 16.5 17.5 18.0 18.5

100 125 150 200 250 300 350 400 450 500 600 700 800

5V 5V 5V 8V 8V 8V 8V 8V 8V

10.5 10.5 13.2 14.0 14.0 14.5 15.0 16.0 16.5 17.5 19.0 20.0

5V 5V 5V 5V

NEMA Sheave Sizes

Above - NEMA Sheave Sizes

5V / 8V 5V / 8V 5V / 8V 5V / 8V 5V / 8V

11 / 7 12 / 7 13 / 8 14 / 9 15 / 9

14 / 24 14 / 26 15 / 26 15 / 25 15 / 27

Exceeds Cast Iron Sheave Rim Speed Special Sheave Material Required

8V 8V 8V

11 12 13

26 27 28

Notes: 1. Horsepowers are nameplate motor horsepowers, and RPMs are motor (driver) speeds. 2. NEMA minimum sheave diameters are from NEMA MG 1, Part 14, Table 14-1. 3. Consult Marathon Electric for applica ons u lizing (1) smaller sheaves and/or more belts than specified 3. (2) variable speed applica ons (3) values outside these recommenda ons. 4. Selec ons are based on a 1.4 service factor, 5 to 1 speed ra o and various Power Transmission Manufacturer's 4. catalogs used as reference. 5. These selec ons are for Narrow V-belt sec ons only. Consult Marathon Electric for details on conven onal 5. V-belt sec ons (A, B, C, D and E), or other belt types. 6. Belt deflected force is per sec on 4 of this document and is the average force required to deflect the center of 6. a belt 1/64 of the belt span distance. Tolerance on this force is ± 1.5 lbf. for forces 6 lbs., and ± 2 lbf. for 6. forces > 6 lbs.

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