12.98 Description
Siemens AG 6SE7087-7NP87-2DD0
SIMOVERT MASTERDRIVES Operating Instructions 2-1
2 Description
The capacitor module is essentially made up of capacitors. It is
connected to the DC link and is used for short-time storage of energy
which is fed back into the DC link when the drives are decelerated. This
energy is then available for subsequent accelerations. The capacitor
module limits the rise of the DC link voltage and smooths it additionally.
Buffer capacitors, pre-charging resistors and a DC link fuse are
accommodated in the capacitor module. Pre-charging is effected
through an additional connection to the AC/rectifier unit and is
monitored by this unit.
The capacitor module does not require a 24 V supply.
C’
C’
Buffer
capacitor
DC link fuse Pre-charging
resistors
Pre-charging
DC link
C/L+
D/L-
PE3
D’
D’
Fig. 2-1 Circuit principle of the capacitor module
Range of application
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