Accessories Installation
BUG 3/2/20 Basic Feed Unit 37
Baumüller Nürnberg GmbH 5.96064.02
5.5.4 BUK Capacitor Unit
Device Description
In the case of converter-fed three-phase current drives that are primarily used as acceleration
drives, e.g. as transverse cutting drives, it is frequently practical to supplement the internal
intermediate circuit capacitor by adding an external capacitor unit. This makes it possible to
store the energy that is fed back at braking of the drive.
Due to the use of a capacitor unit, it may be possible to replace a ballast unit that normally
converts the fed-back energy to heat. In addition, a capacitor unit is always used in cases
where the intermediate circuit voltage must be maintained during brief mains failures.
BUK external capacitor units are integrated in Type Series 6 housings and are available for
intermediate circuit voltages of 310 V and 540 V.
Electrical Data
Type BUK 622 - 31 - 20 BUK 622 - 54 - 05
Capacitance 20 mF 5 mF
Rated voltage 310 V
DC
540 V
DC
Max. intermediate circuit voltage 400 V
DC
800 V
DC
Charging current limitation by use of basic unit
varies depending on type series
(for this, refer to description of basic unit)
Permissible charging time per capacitor unit t > 1 s
Discharge time t > 10 min
Ambient temperature range T
K
0 ... 45 °C
Storage temperature range -30 ... +70 °C
Calculation
Energy storage capacity during braking
()
WCUU
el
=−
1
2
2
2
1
2
**
U1 = intermediate circuit voltage before braking
U2 = intermediate circuit voltage after braking
This gives a storage capacity at braking of:
BUK 622 - 31- 20: approx. 640 Ws (U1 = 310 V, U2 = 400 V)
BUK 622 - 54- 5: approx. 870 Ws (U1 = 540 V, U2 = 800 V)
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