Siemens SIMOTRAS 6SG7050 - Task

Configuration example 01.04
17-2 SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
17.1 Task
The task is to design a crane drive with 100 kW output and a four-pole motor with a duty cycle of
S3-60%.
The task includes the design of the following components, including the ordering information.
- Motor and accessories
- Converter and any accessories required
- Rotor resistors
- Rotor contactors
- Master switch
Note
- Catalog HE 1 • 1999 will be required when selecting the necessary components. The accessories
for SIMOTRAS HD can be found in Catalog DA 65.10 • 1998/99.
- The SIMOTRAS HD three-phase power controller will be included in the Catalog at a later date.
17.2 Selecting a motor
The following motor, which has 3 integral and interconnected temperature sensors that will shut
down the motor if an overtemperature occurs, is to be used (see Catalog HE 1, page 2/19):
Order No.: 1LT8310-4AA40-Z, Z = A11.
The relevant data with respect to the design of the rheostatic controller and the three-phase power
controller are:
- Rated motor current i
1
= 173 A
- Rotor current i
2
= 199 A
- Locked-rotor voltage u
2
= 310 V
- Characteristic rotor resistance k = 0.9
u
2
Formula for k: k =
________
(i
2
x 3 )
The characteristic rotor resistance is required in order to select the correct rotor resistors (see
Section 17.4).
17.3 Selecting an actual value sensor
A pulse encoder is the preferred type of actual value sensor.
The pulse encoder is ordered quoting a short code, e.g. H73 (Catalog M11
• 1999), and a flange
such as G37. The pulse encoder in this case is a Hübner HOG 10 D 1024 I.
Note the following regarding the retrofitting
of the encoder to an existing motor.
We recommend the pulse encoder 6SG7000-2AC15 (2 x 250 pulses/rotation, 15 V supply voltage).
The scope of supply of the pulse encoder includes 3 shaft extensions to facilitate fitting to the motor
shaft.
- Motors from the Catalog HE 1:
• Unbraked motors:
The pulse encoder can be fitted easily to all motors.
• Braked motors:
Retrofitting of a pulse encoder (such as a DC tachometer) is not a simple matter.
- Third-party motors:
If there is a tapped centre hole on the free shaft end, fitting of the pulse encoder is usually very
straightforward.