Mitsubishi Electric EZMOTION MR-E Super MR-E-10A-QW003, Инструкция по эксплуатации

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12 - 3
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)
V
0
Time constant
Emergency stop(EMG)
OFF
ON
Machine speed
t
e
Time
Fig. 12.3 Dynamic brake operation diagram
L
max
60
V
0
J
L
J
M
t
e
1 ............................................................................................................................(12.2)
L
max
: Maximum coasting distance................................................................................................................[mm]
Vo : Machine rapid feed rate................................................................................................................[mm/min]
J
M
: Servo motor inertial moment .......................................................................................... [kg cm
2
][oz in
2
]
J
L
: Load inertia moment converted into equivalent value on servo motor shaft................ [kg cm
2
][oz in
2
]
: Brake time constant................................................................................................................................. [s]
t
e
: Delay time of control section ................................................................................................................... [s]
(There is internal relay delay time of about 30ms.)
Speed [r/min]
T
im
e
const
ant
[m
s]
0
0 1000 2000
5
10
15
20
25
3000 4000 5000 6000
43
13
23
73
Speed [r/min]
Tim
e c
on
sta
nt
[m
s]
52
500 1000 1500 2000 2500 3000
152
20
40
60
80
100
120
0
0
102
202
a. HF-KE W1-S100
b. HF-SE JW1-S100
Fig. 12.4 Dynamic brake time constant
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.
Servo amplifier Load inertia moment ratio [times]
MR-E-10A-QW003 to MR-E-200A-QW003 30
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