Description
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Drawings
Electric Motors
Frame | 256TC |
---|---|
Output | 20 HP (15 kW) |
Number of Poles | 4 |
Frequency | 60 Hz |
Rated speed | 1770 rpm |
Slip | 1.67 % |
Rated voltage | 230/460 V |
Rated current | 50.0/25.0 A |
L. R. Amperes | 375/188 A |
LRC | 7.5x(Code J) |
No load current | 23.6/11.8 A |
Rated torque | 59.3 ft.lb |
Locked rotor torque | 300 % |
Breakdown torque | 300 % |
Locked rotor time | 36s (cold) 20s (hot) |
Moment of inertia (J) | 2.89 sq.ft.lb |
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Design | B |
Insulation Class | F |
Service factor | 1.15 |
Temperature rise | 80 K |
Duty Cycle | Cont.(S1) |
Starting Method | Direct On Line |
Ambient temperature | -20°C to +40°C |
Altitude | 1000 m.a.s.l. |
Degree of Protection | IP55 |
Enclosure | IC411 – TEFC |
Mounting | F-1 |
Rotation¹ | Both (CW and CCW) |
Noise level² | 69.0 dB(A) |
Approx. weight³ | 393 lb |
Efficiency
50% | 75% | 100% |
---|---|---|
91.7 | 92.4 | 93.0 |
Power factor
50% | 75% | 100% |
---|---|---|
0.63 | 0.75 | 0.81 |
Features
Frame Material | Cast Iron |
---|---|
Impregnation Method | Dip and Bake Polyester |
Regreasing System | At Drive end and Non-drive end |
Main terminal box hole | NPT 1 1/2″ |
Terminal Block | Without |
Shaft Locking Device | Without |
Drain | Sinterized, Exd |
Shaft Material | SAE 1040/45 Carbon Steel |
Painting | RAL 5009 202P (ISO 12944 – C4) |
Grounding Lugs | Single |
Fan Cover material | Cast Iron |
Tropicalized Painting | Without |
Fan material | Plastic |
Bearing cap | Yes- Bearing Cap |
Bolt Material | Carbon Steel |
Winding thermal protection | Thermostat – 2 wires 1 per phase 155°C |
Balancing Method | 1/2 Key |
Drip Cover | Without |
Overload protector (phenolic) | Without overload protector |
Connection Cables Quantity | 12 |