DOK-INDRV*-ADDCOMP****-PR05-EN
Rexroth IndraDrive Additional Components and Accessories
6.2.2 Selection
Bosch Rexroth AG 51/431
Transformers
Select the autotransformer according to the mains voltage and the power re‐ quirements of the installation. For the selection, proceed as follows:
1. By means of the required nominal mains voltage range from the dia‐ gram "Classification of the Three-Phase Current Autotransformers in
Type Groups", determine the type group and read the transformation ra‐ tio "i".
2. Calculate the actual transformer output voltage by means of the given nominal mains voltage and the transformation ratio "i".
3. Check the drive data. The output voltage of the transformer has an ef‐ fect on the drive data.
4. Select the three-phase current autotransformer for the determined mains connected load S
LN
.
Determining the mains connected load: See Project Planning Manual
"Rexroth IndraDrive, Drive System" → "Calculations" → "Calculations for the Mains Connection" → "Calculating the Mains-Side Phase Current"
The nominal power of the transformer must at least equal the mains connected load S
LN
.
For DST transformers, the nominal power is identical to the throughput rating.
Fig. 6-2: Classification of the Three-Phase Current Autotransformers in Type
Groups
