ECODRIVE DKC02.1 Drive Controller
CZM auxiliary capacitance module
6-1
DOK-ECODRV-DKC02.1****-PRJ2-EN-P
6
CZM auxiliary capacitance module
6.1 Dimensioning
When braking the drive, the rotary energy available in the mechanics is
released as regenerative energy in the DC bus of the DKC. It can be
•
released in the form of heat via the bleeder module or auxiliary bleeder
integrated into the DKC
- or -
•
stored as energy in the DKC with a connected auxiliary capacitance
module and reused for subsequent acceleration procedures. This re-
duces the power dissipated in the cabinet, and its own energy con-
sumption is reduced.
For successful implementation while avoiding an unnecessary power loss
in the cabinet, note the following:
W
W
rot ZW,
DKC+CZM
≤
Fig. 6-1:
Condition for avoiding power dissipation from the regenerative energy
W
n
Last
M
rot
J
J
2
Nutz
=
⋅
⋅
⋅
+
2
60
2
π
W
rot
:
rotary energy of the application in Ws
n
Nutz
:
maximum effective speed in min-1
J
Last
:
load torque of the application in kgm²
J
M
:
motor inertia
Fig. 6-2: calculating the rotary energy
(
)
W
C
C
U
ZW, DKC+CZM
DKC
CZM
B
2
ZW
2
2
-
U
=
+
⋅
⋅
−
10
3
W
ZW, DKC+CZM
:
storable energy in the DKC with CZM in Ws
C
CZM
:
capacity of the CZM in mF (value = 1.0 mF)
C
DKC
:
DC bus capacity of the DKC in mF (value = 0.15 mF)
U
B
:
response threshold of the bleeder in DKC in V (value = 820)
U
ZW
:
nominal voltage (DC bus) in V (UZW = (
√
2) • 0.98
U
N
)
U
N
:
line voltage (effective value) in V
Fig. 6-3: Calculating the storable energy with a CZM01.1
Calculating the rotary energy of
an application
Storable energy in the DKC with
a connected CZM01.1
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