ECODRIVE DKC01.1/DKC11.1 Drive Controllers
CZM Auxiliary Capacitance Module
6-1
DOK-ECODRV-DKC01/11.1*-PRJ3-EN-P
6
CZM Auxiliary Capacitance Module
6.1 Dimensioning
Note:
Only applies to DKC01.1-040-7-FW and DKC11.1-040-7-FW!
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; energy consumption is low-
ered.
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
J
J
n
ROT
LAST
NUTZ
M
2
(
=
+
⋅
⋅
⋅
(
)
)
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
U
ZW, DKC+CZM
DKC
CZM
B
2
ZW
2
2
(
-
)
=
+
⋅
⋅
−
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
:
UB : Response threshold of the bleeder in DKC in V (value = 820)
U
ZW
:
nominal voltage (DC bus) in V (UZW = (2 • 0.98 UN)
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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