Siemens AC-3 Datasheet Page 26
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Technical Information
A. Recommended selection of contactors for hoisting duty
In hoisting operation, slipring motors are generally used. For this typical hoisting duty, we recommend the contactors listed in the
following table.
Contactor Stator Protection Rotor Protection Max rotor
Type Maximum load current with hoisting motor. Maximum load current with hoisting motor(Delta circuit). standstill
For intermittent duty S3 For intermittent duty S3 voltage
25% 40% 60% 100% 25% 40% 60% 100%
3TF50 00 0A 100 88 78 65 150 130 115 95 1000
3TF52 00 0A 145 130 115 95 220 195 170 150 1000
3TF54 00 0A 225 200 180 160 340 300 270 240 1000
3TF56 00 0A 355 325 290 250 530 490 435 375 1000
When 3 conducting paths are connected in parallel, the maximum load current rises to 2.5 times the value given in this table. When 2 conducting paths are
connected in parallel, it rises to 1.8 times the value given in this table.
B. Selection of contactors for contact endurance: with normal
and inching operation
Contactors suffer more erosion during inching operation than
when stopping motors from a steady speed, i.e. normal
operation. With slipring motors the starting current can be up to
2.5 times the rated current of the motor which means that this
current has to be broken when inching is taking place. During
normal operation, on the other hand, only the rated current has to
be broken under full-load; under part-load it is even less.
Determining contact endurance from AC-2 duty (Ic = 2.5 x Ie) will
only give correct results when 100% inching operation is
involved.
Max. permissible current Contact life when Contactor
and attainable contact breaking the stator Type
endurance when braking contactor load currents
starting current given for S3-100% duty,
below PF
≥≥
≥≥
≥ 0.4 (2.5 x Ie) Ic = Ie, no inching
A Operating cycles A Approx.
Approx. Operating cycles
275 280,000 65 3,500,000 3TF5000
425 250,000 95 3,100,000 3TF5200
625 250,000 160 2,700,000 3TF5400
1000 150,000 250 2,500,000 3TF5600
The maximum permitted current (e.g. locked-rotor current of motor) must not
exceed the values given in the “Max. starting current and attainable contact
endurance” column. The values cannot be increased by paralleling pole
assemblies.
C. Selection of contactors for contact endurance: with mixed
operation
When mixed operation is involved, i.e. primarily breaking of the
motor rated current but with some breaking of higher currents
due to inching, the endurance of the contacts can be calculated
approximately from the following equation:
Where
X = Contact endurance with mixed operation cycles.
A = Contact endurance with normal operation (Ia = Ie) in
operating cycles, from Fig. 1.
B = Contact endurance with inching operation
(Ia = Multiple of Ie) in operating cycles, from Fig. 2,
Breaking current Ia/AC-2 = 2.5xIe.
C = Proportion of inching in total operating Cycles in %.
Fig. 1 Contact endurance of 3TF contactors as a function of breaking current when switching resistive and inductive AC loads.
- Datasheet 2010 1
- Answers for industry 1
- Contactor Relays 3TH30 3
- Selection and ordering data 4
- Dimensional drawings 5
- Power Contactors 3TF 7
- High performance 8
- High reliability 8
- User friendliness and safety 8
- 2 Pole AC contactors - 3TF 9
- Technical data 10
- Electrical Life Curves 14
- Typical Circuit Diagrams 15
- Auto Transformer starter 16
- Permissible Mounting Position 17
- Terminal Designation 17
- Selection table: 18
- Accessories and ordering data 18
- Spares and ordering data 19
- Dimensional drawing 20
- Useful information 23
- Contact life calculation: 23
- Contactors for Hoisting Duty 25
- Technical Information 26
- Useful technical information 28
- AC1 Duty Contactors 3TK5 29
- Recovery time 34
- Benefits and features 34
- Selection and ordering data: 35
- Technical Data 36
- Characteristic Curves 37
- Dimensional Drawing 39
- 3UA52 mounted on 3TF 32/33 40
- 3UA55 mounted on 3TF 34/35 41
- 3UA58 with independent 41
- 3UA5800 mounted on 3TF46/47 41
- 3UA5830 with individual 42
- 3UA5830 mounting on 3TF50 42
- 3UA6230 CT Operated Birelay 43
- 3UA68 CT Operated Birelay 43
- 3UC50 CT Operated Birelay 44
- 3VU13 and 3VU16 45
- Times set current 49
- Accessories: 50
- Connection diagrams 51
- Dimensional Drawings 53
- Starters 55
- Application 56
- Standard 56
- Ordering data 57
- Spares for starters 58
- Single line diagram SLD 59
- Use M4 screws for mounting 62
- C1: DOL without relay 64
- Current/rated op. current 66
- C. Industrial Starter: 67
- L lph Set-Range Available 68
- Your partners 72
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