SIEMENS
7/267
Siemens D 21.4 · 2017
SINAMICS S120 drive system
Blocksize format
Braking resistors for blocksize format
7
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Overview
Braking resistor for PM240-2 Power Modules, frame size FSD
Excess energy in the DC link is dissipated in the braking resistor.
The braking resistors are intended for use with PM240-2 Power
Modules which feature an integrated braking chopper, but can-
not regenerate energy to the supply system. For regenerative
operation, e.g. the braking of a rotating mass with high moment
of inertia, a braking resistor must be connected to convert the re-
sulting energy into heat.
The braking resistors can be installed laterally next to the
PM240-2 Power Modules. The braking resistors for the Power
Modules, frame sizes FSD to FSF, should be placed outside the
control cabinet or outside the switchgear room so that the heat
is dissipated away from the Power Modules. The level of air con-
ditioning required is therefore reduced.
Every braking resistor has a temperature switch (UL-listed). The
temperature switch should be evaluated to prevent consequen-
tial damage if the braking resistor overheats.
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Integration
Braking resistors that are optionally available depending on the Power Module used
S = Lateral mounting
–
= Not possible
Frame size
FSA
FSB
FSC
FSD
FSE
FSF
PM240-2 Power Module with integrated braking chopper
Available frame sizes
• 200 V versions
• 400 V versions
• 690 V versions
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DC link components
Braking resistor
S
S
S
S
S
S
© Siemens AG 2017