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2.1 Mechanical configuration
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 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
2.1.2 Mains infeed module
The mains infeed module performs the following tasks:
S Supplies power for the SINUMERIK 840D and axis modules
S Generates the DC link voltage for the motors
S Regenerative feedback (I/RF) or braking resistor (OI) for generator-mode
operation
If the internal braking resistance is not sufficient, pulsed resistor modules can be
installed.
The I/RF module feeds back into excess DC link energy generated during brak-
ing the supply system.
The I/RF or OI module is installed as the first module on the left.
References: PJ1/ Planning Guide for SIMODRIVE 611D
Mains infeed
module
Open-loop-
controlled infeed
OI
Infeed/regenerative
feedback module
I/RF
Arrangement of
mains infeed
module
2 Confi
uration
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