Instruction Manual MC6000
4-9
Warning - Danger of Death!
It is your responsibility to ensure that the braking process remains within the approved limits in
the graph in diagram 2 and below the limit values in the table below. For longer periods of
braking at higher braking power, the power stage will be blocked to protect it from overvoltage.
When this occurs the Servocontroller will not control the motor in any way. The motor or the
installation may be damaged. Danger of death!
Fig. 2: Permissible Braking Power related to braking duration ED
Br
.
6
4
3
2
1
10
20
30
40
50
60
70
80
90
100
110
120
P
kW
t
Br
s
0
50
100
ED
Br
%
5
P
eff
P
max
A
BR2 (90
Ω
)
BR3 (90
Ω
)
B
10
20
30
40
60
70
80
90
1
2
Standard version:
A -
single braking process
(waiting time
≥
10 min., heat
sink temperature
≤
60° C).
B -
Cyclic braking with braking
duration ED
Br
.
BR2 and BR3:
For details of other braking
resistors see table below. The
continuous performance of the
external resistor must be
appropriate!
1 - permissible operation for
single braking
(Example 1).
2 - operation for cyclic
braking, use BR2 not
permissible
(Example 2).
1) Any point on the curves can be calculated from the permissible braking energy Emax.
2) Only for MC6412 to MC6464; 3) only for MC6432, MC6464; 4) only for MC6464.
Note: It is important to differentiate between
•
Internal ON duration ED
i
: switch-on limit of internal braking transistor (duty cycle)
ED
i
= 10 % means max. 8 seconds braking with peak braking power per cycle
ED
i
= 100 % means no limit continuous peak braking performance possible..
•
Braking duration ED
Br
:
Br
Sp
Br
Br eff
eff
max
Permissible Braking Power related to braking duration ED
BR3
Braking time t . (only
(applies to t = 120 s)
s
0 ... 8
10
20
30
40
60
120
0 ... 120
Braking duration ED
% 0 ... 6,6 8,3
16,6
25
33,3
50
100
0 ... 100
E
1)
Braking power
Curve A
kW
6
4,8
2,4
1,6
1,1
0,6
P
–
4.800 Ws
Curve B
kW
device dependent P = E / t
–
P · 120 s
BR2 with 90
kW
6
4,8
2,4
1,6
1,2
0,8
0,4
6
48.000 Ws
BR2 with 75
kW
7,3
5,9
2,9
1,9
1,4
0,98 0,49
7,3
59.000 Ws
BR2 with 33 2)
kW
16,7
13,4
6,7
4,4
3,3
2,2
1,1
16,7
134.000 Ws
BR2 with 21 3)
kW
26,3
21,1 10,5
7
5,2
3,5
1,7
26,3
211.000 Ws
BR2 with 15 4)
kW
37
29,6 14,8
9,8
7,4
4,9
2,4
37
296.000 Ws
max
Br
Ω
Ω
Ω
Ω
Ω
Braking duration ED
Sum of braking time
Cycle duration
Br
=
⋅
100 %
Br
