9 - 4
9. CHARACTERISTICS
9.3 Dynamic brake characteristics
Fig. 9.3 shows the pattern in which the servo motor comes to a stop when the dynamic brake is operated.
Use Equation 9.2 to calculate an approximate coasting distance to a stop. The dynamic brake time
constant t varies with the servo motor and machine operation speeds. (Refer to Fig. 9.4. Please contact us
for the servo motor not indicated.)
Emergency
stop(EMG) OFF
ON
Machine speed
V
0
t
e
Time constant
Time
Fig 9.3 Dynamic Brake Operation Diagram
Lmax
60
Vo
J
L
J
M
t
e
1
....................................................................................................................... (9.2)
L max : Maximum coasting distance................................................................................................ [mm][in]
V
0
: Machine rapid feedrate.........................................................................................[mm/min][in/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.)
0
500
1000
1500
2000
0.04
0.03
0.02
0.01
0
T
im
e
c
ons
tant
0.005
0.015
0.025
0.035
0.045
Speed
HA-LF (S) 30K2
HA-LF (S) 37K2
HA-LF (S) 45K24
0
500
1000
1500
2000
0.04
0.03
0.02
0.01
0
T
im
e
c
ons
tant
0.005
0.015
0.025
0.035
0.045
HA-LF (S) 55K24
HA-LF (S) 37K24
HA-LF (S) 30K24
Speed
Fig 8.3 Dynamic Brake
If the dynamic brake is operated at more than 10 times as large as the ratio of load inertia moment to
servo motor inertia moment, the brake resistor of the dynamic brake may burn out. If the value is
exceeded, contacts us.
Downloaded from
Summary of Contents for MELSERVO MR-HP30KA
Page 11: ...A 10 MEMO Downloaded from ManualsNet com search engine ...
Page 15: ...4 MEMO Downloaded from ManualsNet com search engine ...
Page 63: ...5 6 5 PARAMETER MEMO Downloaded from ManualsNet com search engine ...
Page 71: ...7 6 7 TROUBLESHOOTING MEMO Downloaded from ManualsNet com search engine ...
Page 79: ...8 8 8 OUTLINE DIMENSIONAL DRAWINGS MEMO Downloaded from ManualsNet com search engine ...
