Table of Contents
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Drive Setup
Calculation of current during deceleration
(J
+
J
)
I
=
Motor
Load
M
k
t
Calculation of energy
1
E
(J
+
J
)(ω
=
dec
M
L
2
E
3I
(R
2
=
/
motor
M
M
1
E
T
(ω
-
=
friction
f
1
2
E
=
E
-
E
M
dec
motor
1
E
C(V
-
V
2
=
BUS
M
NOM
2
Since E
>E
, a regenerative resistor is needed.
M
BUS
Calculation of resistor specification
V
=
K
N
-
I 3
(
B
B
M
V
2
R
=
M
=
MAX
V
I
3
B
M
1
E
C(V
−
M
High
2
P
=
AV
t
cycle
2
420
V
P
=
=
M
PK
132
R
Re
gen
4.11.3 Regenerative resistor overload protection
Motor energy regeneration in CDHD2S is always active.
The motor energy regeneration function has two modes:
Regeneration with resistor overload protection.
⚫
The regenerative resistor circuit requires overload protection to ensure reliable operation of
the resistor. In this mode, you can configure the CDHD2S regenerative resistor parameters for
protection.
Regeneration without resistor overload protection. This mode is also called bang-bang mode.
⚫
In bang-bang mode, the drive will activate the regenerative resistor when the upper threshold
is exceeded (400V for medium-voltage drives, 770V for high-voltage drives); when the bus voltage
drops to the lower threshold (400V for medium-voltage drives) 380V,
ω
-
ω
0.001
0.000484
+
1
2
=
t
1.188
d
1
ω
2
)
(0.0015
−
=
2
2
2
1
1.32
2)
t
=
3
18
(
2
d
2
1
ω
)t
(261
-
=
1
5 .
2
d
2
-
E
=
91.633
-
11.611
friction
1
(
)
2
=
. 0
001120
420
2
R
)
=
0.0812
2500
M
2
2
420
=
31
182
.
423
18
3
2
V
2
44.42
−
−
LOW
=
2
5686
65
=
.
W
261
=
18
0.0181
0.000484
)(261
2
-
0)
+
)
0.0181
=
11.61
J
0)
ft
lb
=
. 0
0181
. 3
54
-
4.8
=
75.22J
)
J
−
=
2
2
340
34
.
05
1.32
-
3
18
(
)
=
182.423
2
Ω
.
02
1
0.001120
(400
2
−
2
5.03
A
67.57ft
lb
9
=
=
. 1
63
J
=
4
8 .
V
380
2
)
7.1W
=
J
—98—
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