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12. CHARACTERISTICS
12.3 Dynamic brake characteristics
Fig. 12.3 shows the pattern in which the servo motor comes to a stop when the dynamic brake is operated.
Use Equation 12.2 to calculate an approximate coasting distance to a stop. The dynamic brake time constant
varies with the servo motor and machine operation speeds. (Refer to Fig. 12.4)
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V
0
L
max
60
L
: Maximum coasting distance................................................................................................................[mm]
max
Vo
: Machine rapid feed rate................................................................................................................[mm/min]
J
: Servo motor inertial moment .......................................................................................... [kg cm
M
J
: Load inertia moment converted into equivalent value on servo motor shaft ................ [kg cm
L
: Brake time constant................................................................................................................................. [s]
t
: Delay time of control section ................................................................................................................... [s]
e
(There is internal relay delay time of about 30ms.)
25
20
15
10
5
0
Use the dynamic brake under the load inertia moment ratio indicated in the following table. If the load inertia
moment is higher than this value, the built-in dynamic brake may burn. If there is a possibility that the load
inertia moment may exceed the value, contact Mitsubishi.
ON
Emergency stop(EMG)
OFF
Machine speed
Fig. 12.3 Dynamic brake operation diagram
J
L
t
1
............................................................................................................................(12.2)
e
J
M
73
23
13
43
0
1000 2000
3000 4000 5000 6000
Speed [r/min]
a. HF-KE W1-S100
Fig. 12.4 Dynamic brake time constant
Servo amplifier
MR-E-10A-QW003 to MR-E-200A-QW003
Time constant
V
0
t
e
120
100
80
60
40
20
0
0
Load inertia moment ratio [times]
12 - 3
Time
52
102
202
152
500 1000 1500 2000 2500 3000
Speed [r/min]
b. HF-SE JW1-S100
30
2
2
][oz in
]
2
2
][oz in
]
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