Description
256TTFNA16574 – Marathon 20 HP Severe Duty Motor, 3 phase, 1800 RPM, 230/460 V, 256T Frame, TEFC – U872A
256TTFNA16574 Marathon Low Voltage NEMA Cooling Tower Motors
Please advise CFM, static pressure, voltage, phase, and/or horsepower on specifications, drawings, or existing equipment for an accurate quote.
General Specifications
| UPC: |
722856018847 |
Weight: |
382 LB |
| Packaged Length: |
31.25 IN |
Packaged Width: |
22.25 IN |
| Packaged Height: |
18 IN |
Nameplate Specifications
| Output HP: |
20 Hp |
Output KW: |
14.9 kW |
| Frequency: |
60/50 Hz |
Voltage: |
230/460 V |
| Current: |
48.0/24.1 A |
Speed: |
1775 rpm |
| Service Factor: |
1.15 |
Phase: |
3 |
| Efficiency: |
93 % |
Power Factor: |
84 |
| Duty: |
Continuous |
Insulation Class: |
F |
| Design Code: |
B |
KVA Code: |
G |
| Frame: |
256T |
Enclosure: |
Totally Enclosed Fan Cooled |
| Thermal Protection: |
No |
Ambient Temperature: |
40 °C |
| Drive End Bearing Size: |
6309 |
Opp Drive End Bearing Size: |
6210 |
| UL: |
Recognized |
CSA: |
Y |
| CE: |
Y |
IP Code: |
55 |
Technical Specifications
| Electrical Type: |
Squirrel Cage Inverter Rated |
Starting Method: |
Line Or Inverter |
| Poles: |
4 |
Rotation: |
Reversible |
| Resistance Main: |
.474 Ohms |
Mounting: |
Rigid Base |
| Motor Orientation: |
Horizontal |
Drive End Bearing: |
Ball |
| Opp Drive End Bearing: |
Ball |
Frame Material: |
Cast Iron |
| Shaft Type: |
T |
Overall Length: |
25.40 in |
| Frame Length: |
12.25 in |
Shaft Diameter: |
1.625 in |
| Shaft Extension: |
4.2 in |
Assembly/Box Mounting: |
F1/F2 Capable |
Speed Characteristics
| Curvepoint |
Current (Amps) |
Current (%) |
Torque (ft-lbs) |
(%) |
Speed (RPM) |
Rated Output (KW) |
Power Factor (%) |
Rated Output (Hp) |
| 2/3 |
105.00 |
436.0 |
115.00 |
194.0 |
1,200 |
|
|
20.00 |
| Full Load |
24.10 |
100.0 |
59.20 |
100.0 |
1,775 |
|
|
20.00 |
| 1/3 |
125.00 |
519.0 |
90.00 |
152.0 |
600 |
|
|
20.00 |
| Break-Down |
86.00 |
357.0 |
146.00 |
247.0 |
1,625 |
|
66.0 |
20.00 |
| No Load |
8.50 |
35.0 |
0.00 |
0.0 |
1,800 |
|
|
20.00 |
| Pull-Up |
115.00 |
477.0 |
100.00 |
169.0 |
900 |
|
|
20.00 |
| Locked-Rotor |
138.00 |
573.0 |
105.00 |
177.0 |
0 |
|
40.0 |
20.00 |
Load Characteristics
| % of Rated Load |
0 % |
25 % |
50 % |
75 % |
100 % |
115 % |
125 % |
| Current (Amps) |
8.50 |
10.50 |
14.00 |
18.50 |
24.10 |
27.00 |
30.00 |
| Rated Output (KW) |
0.60 |
4.00 |
8.00 |
12.00 |
16.00 |
18.00 |
20.50 |
| Efficiency (%) |
0.0 |
90.0 |
93.0 |
93.6 |
93.0 |
92.4 |
91.7 |
| Power Factor (%) |
8.5 |
51.0 |
72.0 |
81.0 |
84.0 |
84.5 |
85.0 |
| Speed (RPM) |
1,800 |
1,795 |
1,785 |
1,780 |
1,775 |
1,770 |
1,760 |
| Temp. Rise @ FL |
0.0 |
0.0 |
0.0 |
0.0 |
65.0 |
85.0 |
105.0 |
| Torque (ft-lbs) |
0.00 |
14.50 |
29.50 |
44.50 |
59.20 |
68.00 |
74.50 |
Marathon Motors
Regal Beloit
