7. Options
7-6
7-4 Dynamic braking (DBR).
The VAT2000 includes a dynamic braking feature in drives up to U2KN07K5S and U2KX07K5S . For
larger drives the dynamic braking is achieved by using external modules
7-4-1 Units U2KN07K5S and smaller, and U2KX07K5S and smaller
These drives include a dynamic braking feature and a DB resistor as standard. The DBR device, allows
operation cycle of 10% ED as shown in Fig. 7-2.
When using the dynamic braking option, set parameter B18-1, and C31-1, accordingly.
T
t2
t1
S p e ed
Fig. 7-2
(1) Unit built-in DBR
The wiring of resistor built into the unit is shown in Fig. 7-3, and ratings are shown in table 7-3
Because of space restrictions, these resistors do not allow 100% of braking torque in some cases.
Table 7-3
Device
type
U2KN
Resistance
capacity
(W)
Resistance
value
(
Ω
)
Braking
torque
(%) (1)
Max.
t1
(SEC)
00K4S
120
220
180
30
00K7S
120
220
100
30
01K5S
120
220
50
30
02K2S
120
180
40
20
04K0S
120
110
40
10
05K5S
120
91
30
10
07K5S
120
91
25
10
(Note 1) The braking torque is given for constant torque ratings. When using variable torque ratings, the
braking torque is the value given for one frame smaller drive.
Device
type
U2KX
Resistance
capacity
(W)
Resistance
value
(
Ω
)
Braking
torque
(%)
Max.
t1
(SEC)
00K4S
120
430
300
10
00K7S
120
430
200
10
01K5S
120
430
100
10
02K2S
120
430
65
10
04K0S
120
430
40
10
05K5S
120
430
25
10
07K5S
120
430
20
10
T
≥
10min
t1 + t2+ ...
≤
1min.