Dynamic Brake Characteristics - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

Dynamic brake characteristics

CAUTION
• The coasting distance is a theoretically calculated value which ignores the running load such as friction. The calculated value is considered to be longer than
the actual distance. However, if an enough braking distance is not provided, a moving part may crash into the stroke end, which is very dangerous. Install the
anti-crash mechanism such as an air brake or an electric/mechanical stopper such as a shock absorber to reduce the shock of moving parts. No linear servo
motor with an electromagnetic brake is available.
• Do not use dynamic brake to stop in a normal operation as it is the function to stop in emergency.
• For a machine operating at the recommended load to motor mass ratio or less, the estimated number of
usage times of the dynamic brake is 1000 times while the machine decelerates from the rated speed to a
stop once in 10 minutes.
• Be sure to enable EM1 (Forced stop 1) after the linear servo motor stops when using EM1 (Forced stop 1)
frequently in other than emergency.
The approximate coasting distance from when the dynamic brake is activated until when the linear servo motor stops can be
calculated with the equation below.
Lmax = V • (0.03 + M • (A + B • V
0
Lmax: Coasting distance of the machine [m]
V : Speed when the brake is activated [m/s]
0
M: Full mass of the moving part [kg]
A: Coefficient (Refer to the following tables.)
B: Coefficient (Refer to the following tables.)
Linear servo motor (primary side)
LM-H3P2A-07P-BSS0
LM-H3P3A-12P-CSS0
LM-H3P3B-24P-CSS0
LM-H3P3C-36P-CSS0
LM-H3P3D-48P-CSS0
LM-H3P7A-24P-ASS0
LM-H3P7B-48P-ASS0
LM-H3P7C-72P-ASS0
LM-H3P7D-96P-ASS0
LM-U2PAB-05M-0SS0
LM-U2PAD-10M-0SS0
LM-U2PAF-15M-0SS0
LM-U2PBB-07M-1SS0
LM-U2PBD-15M-1SS0
LM-U2PBF-22M-1SS0
LM-U2P2B-40M-2SS0
LM-U2P2C-60M-2SS0
LM-U2P2D-80M-2SS0
LM-FP2B-06M-1SS0
LM-FP2D-12M-1SS0
LM-FP2F-18M-1SS0
LM-FP4B-12M-1SS0
LM-FP4D-24M-1SS0
LM-FP4F-36M-1SS0
LM-FP4H-48M-1SS0
LM-FP5H-60M-1SS0
LM-K2P1A-01M-2SS1
LM-K2P1C-03M-2SS1
2
))
0
Coefficient A
-3
7.15  10
-3
2.81  10
-3
7.69  10
-3
7.22  10
-3
1.02  10
-3
7.69  10
-4
9.14  10
-4
7.19  10
-4
6.18  10
-2
5.72  10
-2
2.82  10
-2
1.87  10
-2
3.13  10
-2
1.56  10
-2
4.58  10
-3
1.47  10
-3
1.07  10
-4
9.14  10
-4
8.96  10
-4
5.55  10
-4
4.41  10
-4
5.02  10
-4
3.55  10
-4
1.79  10
-4
1.15  10
-4
1.95  10
-3
5.36  10
-3
1.17  10
Coefficient B
-3
2.94  10
-3
1.47  10
-4
2.27  10
-4
1.13  10
-4
2.54  10
-4
2.14  10
-4
2.59  10
-4
1.47  10
-5
9.59  10
-4
1.72  10
-5
8.60  10
-5
5.93  10
-4
1.04  10
-5
5.18  10
-5
1.33  10
-5
1.27  10
-6
7.66  10
-6
5.38  10
-3
1.19  10
-4
4.81  10
-4
2.69  10
-4
4.36  10
-4
1.54  10
-4
1.36  10
-4
1.19  10
-5
4.00  10
-3
6.56  10
-4
3.75  10
14 USING A LINEAR SERVO MOTOR
14.4 Characteristics
14
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