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(2) For use in two dynamic braking units
Moment of inertia J
Motor
Inverter
for one motor (GD
(kW)
(kW)
kg . m
18.5
22.0
0.16 ( 0.64)
22.0
22.0
0.19 ( 0.76)
30.0
30.0
0.30 ( 1.20)
37.0
37.0
0.35 ( 1.40)
45.0
45.0
0.40 ( 1.60)
55.0
55.0
0.55 ( 2.20)
75.0
75.0
1.03 ( 4.12)
90.0
90.0
1.23 ( 4.92)
110.0
110.0
1.83 ( 7.32)
(3) Mean braking torque with one size bigger capacity
In a standard combination of a motor and an inverter, the braking torque is limited by the
overcurrent strength of the inverter. However, by increasing the rank of the inverter, you
can use the maximum torque of the motor.
Table 9.3 shows the braking torques of the inverters whose capacity is increased by one.
The motor capacity must be raised when 135% or more braking is required.
Table 9.3 Requirements for maximizing the braking torque of motor
Requirement:
‡ @ Mean braking torque
‡ B T
B
= 0.5
B
Moment of inertia J
Motor
Inverter
for one motor (GD
(kW)
(kW)
kg . m
18.5
22.0
0.16 ( 0.64)
22.0
22.0
0.19 ( 0.76)
30.0
30.0
0.30 ( 1.20)
37.0
37.0
0.35 ( 1.40)
45.0
45.0
0.40 ( 1.60)
55.0
55.0
0.55 ( 2.20)
75.0
75.0
1.03 ( 4.12)
90.0
90.0
1.23 ( 4.92)
110.0
110.0
1.83 ( 7.32)
Table 9.2 For use in two dynamic braking units
Rated torque of the motor
2
)
2
2
(kgf . m
)
50Hz
122 ( 12.4)
144 ( 14.7)
197 ( 20.0)
243 ( 24.7)
295 ( 30.1)
361 ( 36.8)
492 ( 50.2)
588 ( 60.0)
719 ( 73.3)
(when the inverter capacity is increased by one)
135% (To
1.35)
A
T
B
Rated torque of the motor
2
)
2
(kgf . m
2
)
50Hz
122 ( 12.4)
144 ( 14.7)
197 ( 20.0)
243 ( 24.7)
295 ( 30.1)
361 ( 36.8)
492 ( 50.2)
588 ( 60.0)
719 ( 73.3)
To: N . m (kgf . m)
30K
4
T
A
60Hz
B
101 ( 10.3)
120 ( 12.2)
164 ( 16.7)
202 ( 20.6)
170
245 ( 25.0)
140
300 ( 30.6)
120
407 ( 41.5)
487 ( 49.6)
595 ( 60.7)
‡ A Increasing the inverter capacity by one
‡ C The operation frequency and other conditions are
the same as those in Table 9.1 and Table 9.2.
Number of sets of dynamic braking units
To: N . m (kgf . m)
30K
4
60Hz
T
A
B
101 ( 10.3)
1
120 ( 12.2)
1
164 ( 16.7)
2
202 ( 20.6)
2
245 ( 25.0)
2
300 ( 30.6)
407 ( 41.5)
487 ( 49.6)
595 ( 60.7)
- 22 -
Motor torque ratio %
E2
EZ2
55K
30K
55K
2
10
6
T
A
T
T
A
B
B
B
230
190
140
230
110
195
95
159
and resistors required
E2
EZ2
55K
30K
55K
2
10
6
T
A
T
A
T
B
B
B
1
1
1
1
1
2
1
2
2
1
2
2
2
2
110K
3
A
T
A
B
110K
3
A
T
A
B
1
1
1
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