Siemens SIMOTRAS 6SG7050 - Page 594

Configuration example 01.04
17-4 SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
Notes to Figure 2
- The maximum torque is determined by the converter or the pull-out torque of the motor. In this
case the rated controller current is based on two times the overload figure.
- The characteristic curves can also be different, especially for contactor stage 1, as the position of
the curves varies from application to application.
Resistor selection table
Contactor
stage
s R = s x k ü I
R
= i
2
x ü Selected
resistance
value
Calculated tap/
tap terminal
Order number
4 0.05
0.05
Ω
1.2 239 A
3 x 0.07 Ω
71 % / 9 3PR3 801-3B
3 0.1
0.1
Ω
1 199 A
3 x 0.07 Ω
43 % / 5 3PR3 801-3B
2 0.25
0.23
Ω
1 199A
3 x 0.19 Ω
47 % / 5 3PR3 801-3E
1 0,5
0.45
Ω
1 199 A
3 x 0.26 Ω
46 % / 5 3PR3 801-3F
Y 2
1.8
Ω
0.6 119 A
3 x 1.4 Ω
86 % / 9 3PR3 801-3L
- s: slip, see Figure 2, speed-torque diagram.
- k: characteristic rotor resistance k, see motor data.
- R: required resistance value for selected contactor stage.
- ü: field values, can be varied on the plant by changing the connections on the resistor taps.
- I
R
: current through resistor or rotor current.
- Y: counter-torque stage, see 2 usually
- tap, example for contactor stage 2
Required: 0.3
Ω, Σ selected resistance values contactor stages 4 and 3 = 0.14 Ω.
⇒ 0.23 Ω – 0.14 Ω = 0.09 Ω will be required.
One resistance bank of 0.19
Ω is selected.
⇒ 0.09 Ω / 0.19 Ω x 100 % = 47 % of the resistance will be required. Terminal 3 is selected from
the associated connection diagram (no. A 081 064) for cast-iron resistor bank 3PR3 801-01-3E.
- Start-up:
It will be necessary in many cases to improve the drive response on the plant by reconnecting the
contactor stages to optimize resistance grading.
3
Contactor
stage 4
9
-3B -3B -3E -3F -3L
33 3 3
3
33
9
Contactor
stage 3
Contactor
stage 2
Contactor
stage 1
Y
(short-
circuited)
3
M
3 ~
3
3PR3801
0
11
11 11
11 11
0000
*) Caution: the resistance of the rotor cable may have to be taken into account in contactor stage 4
*)
Figure 3, Connection diagram for rotor resistors