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4 Characteristics
MITSUBISHI CNC
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(2) Coasting rotation distance during emergency stop
The distance that the motor coasts (angle for rotary axis) when stopping with the dynamic brakes can be
approximated with the following expression.
L
MAX
: Motor coasting distance (angle) [mm, (deg)]
F : Axis feedrate [mm/min, (deg/min)]
N : Motor speed [r/min]
J
M
: Motor inertia
[kg•cm
2
]
J
L
: Motor shaft conversion load inertia
[kg•cm
2
]
t
e
: Brake drive relay delay time [s] (Normally, 0.03s)
A : Coefficient A (Refer to the next page)
B : Coefficient B (Refer to the next page)
,
/
,
.
.
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V
G
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N
Dynamic brake braking diagram
Motor speed
Actual dynamic brake operation
Dynamic brake control output
Emergency stop (EMG)
OFF
ON
OFF
ON
OFF
ON
t
e
Time
Coasting amount