3TF4922-0A データシートの表示（PDF） - Siemens AG
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3TF4922-0A Datasheet PDF : 72 Pages
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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
Type
3TF50 00 0A
3TF52 00 0A
3TF54 00 0A
3TF56 00 0A
Stator Protection
Maximum load current with hoisting motor.
For intermittent duty S3
25%
40%
60%
100
88
78
145
130
115
225
200
180
355
325
290
100%
65
95
160
250
Rotor Protection
Maximum load current with hoisting motor(Delta circuit).
For intermittent duty S3
25%
40%
60%
100%
150
130
115
95
220
195
170
150
340
300
270
240
530
490
435
375
Max rotor
standstill
voltage
1000
1000
1000
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 C. Selection of contactors for contact endurance: with mixed
and inching operation
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
and attainable contact
endurance when braking
starting current given
below PF ≥ 0.4 (2.5 x Ie)
Contact life when
breaking the stator
contactor load currents
for S3-100% duty,
Ic = Ie, no inching
Contactor
Type
A
Operating cycles
A
Approx.
Approx.
Operating cycles
275
280,000
425
250,000
625
250,000
65
3,500,000
3TF5000
95
3,100,000
3TF5200
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.
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.
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