Functions
8.15 Brake functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-91
Warning
Braking resistors, which are to be mounted on SINAMICS G120, must be designed so that
they can tolerate the power dissipated.
If an unsuitable braking resistor is used there is a danger of fire and that the associated
inverter will be significantly damaged.
The chopper control, integrated in the inverter is designed for the braking resistor value
assigned in Catalog; e.g.:
• Power Module PM240 6SL3224-0BE24-0AA0
• brake resistor 6SL3201-0BE12-0AA0
• brake resistor value 160 Ω
A brake resistor with a lower resistance value will destroy the inverter. In this case, an
external braking unit must be used.
When operational, the temperature of braking resistors increases – do not touch! Ensure that
there is sufficient clearance around the unit and there is adequate ventilation.
A temperature protection switch must be used to protect the units against overheating.
Note
The switch-on threshold V
DC
chopper of the dynamic resistor braking is dependent on P1254
V
DC chopper
(P1254 = 0) ≠V
DC chopper
(P1254 ≠0).
External braking modules (chopper units) including braking resistor can be used with all of
the sizes of inverters. When engineering the system, the particular braking module/resistor
must be taken into consideration.
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