Coasting Amount - Mitsubishi CNC Meldas HC Series Specification Manual

4-2-2 Coasting amount

The motor coasting amount when stopped by a dynamic brake can be approximated using the following
expression.
L =
MAX
Emergency stop (EMG)
Dynamic brake control
Dynamic brake actual operation
J
M
Motor type
(kgf•cm•sec
HC52 (Note 1) 0.0067
HC52 (Note 2) 0.0067
HC102 0.014
HC152 0.02
HC202 0.043
HC352 0.084
HC452 0.123
HC702 0.163
HC902 0.208
Note 1. When using MDS-B-SVJ2
Note 2. When using MDS-B-V1/V2/V14/V24
Chapter 4 Characteristics
× 10
3
F
× te + ( 1 +
G0
60
L : Machine coasting amount
MAX
F : Feedrate (Rapid traverse)
G0
N : Motor speed (speed at rapid traverse)
J : Motor inertia
M
J : Motor shaft conversion load inertia
L
te : Brake drive relay delay time (Normally, 0.03sec) (sec)
A : Coefficient A (Refer to the table below)
B : Coefficient B (Refer to the table below)
OFF
ON
OFF
ON
OFF
ON
Feedrate
Initial feedrate F
Fig. 4-3 Dynamic brake braking diagram
Table 4-3 Coasting amount calculation coefficients
A B
2
)
− 9
9.57 × 10 7.09 × 10
− 9
3.59 × 10 4.79 × 10
− 9
2.47 × 10 5.69 × 10
− 9
1.76 × 10 5.89 × 10
− 9
15.20 × 10 9.56 × 10
− 9
8.74 × 10 13.02 × 10
− 9
2.80 × 10 19.26 × 10
− 9
13.30 × 10 6.82 × 10
− 9
2.07 × 10 26.52 × 10
J
L
) × 1.1 × (A × N
2
J
M
G0

Coasting amount

t
e
Motor type
(kgf•cm•sec
− 3
HC53 (Note 1)
− 3
HC53 (Note 2)
− 3
HC103
− 3
HC153
− 3
HC203
− 3
HC353
− 3
HC453
− 3
HC703
− 3
HC103R
HC153R
HC203R
HC353R
HC503R
4–6
+ B)
(mm)
(m/min)
(r/min)
(kgf•cm•sec
(kgf•cm•sec
Time
J
M
A
2
)
− 9
9.49 × 10
0.0067
− 9
2.56 × 10
0.0067
− 9
1.95 × 10
0.014
− 9
1.28 × 10
0.02
− 9
9.77 × 10
0.043
− 9
4.97 × 10
0.084
− 9
2.44 × 10
0.123
− 9
1.58 × 10
0.163
− 9
1.24 × 10
0.0015
− 9
0.95 × 10
0.0019
− 9
0.59 × 10
0.0023
− 9
1.18 × 10
0.0085
− 9
0.96 × 10
0.0122
2
)
2
)
B
− 3
6.37 × 10
− 3
6.09 × 10
− 3
6.98 × 10
− 3
9.13 × 10
− 3
60.90 × 10
− 3
24.23 × 10
− 3
32.87 × 10
− 3
36.65 × 10
− 3
1.22 × 10
− 3
1.20 × 10
− 3
1.61 × 10
− 3
5.19 × 10
− 3
5.64 × 10