Mitsubishi Electric FR-A700 Technical Manual page 513

(2) Brake unit-generated heat
When a brake unit is used, heat is generated by the
brake unit and the brake resistor.
1) Heat generated by the brake unit (excluding that
of the brake resistor) is found according to the
diagram as shown below.
2) Heat loss of the brake resistor is calculated by the
following expression:
2
J N
P[W] =
13700
: Overall reflected to motor shaftJ
J
motorJ ) [kg m
M
N : Motor speed [r/min]
S : Number of deceleration [times/min]
120
100
80
60
40
20
0 20
600
500
400
300
200
100
5
0 20
Brake unit duty (%ED)
b) FR-BU type
S
(including
T
2
]
40 60 80 100
Brake unit duty (%ED)
a) BU type
40 60 80 100
300
250
200
150
100
50
0
0 10 20 30 40 50 60 70 80 90 100
Brake unit duty (%ED)
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100
Brake unit duty (%ED)
350
300
250
200
150
100
50
0
0
10 20 30 40 50 60 70 80 90 100
Brake unit duty (%ED)
c) FR-BU2 type
Brake unit-generated heat
547
SELECTION
200V class
400V class
3