SMC Networks LECSN-T Series User Manual

10. CHARACTERISTICS
10 - 6
L
max
: Maximum coasting distance ······················································································· [mm]
V
0
: Machine's fast feed speed ····················································································· [mm/min]
J
M
: Moment of inertia of the servo motor ··································································· [× 10
-4
kg•m
2
]
J
L
: Load moment of inertia converted into equivalent value on servo motor shaft ·············· [× 10
-4
kg•m
2
]
τ: Dynamic lock time constant ······························································································ [s]
t
e
: Delay time of control section ···························································································· [s]
There is internal relay delay time of about 10 ms.
(2) Dynamic lock time constant
The following shows necessary dynamic lock time constant τ for equation 10.2.
Dynamic brake time
constant [ms]
0
10
20
30
40
50
0 1000 2000 3000 4000 5000 6000
73
43
23
13
053
Speed [r/min]
LE-T
□
-
□
10.3.2 Permissible load to motor inertia when the dynamic lock is used
Use the dynamic lock under the load to motor inertia ratio indicated in the following table. If the load inertia
moment is higher than this value, the dynamic lock may burn. If the load to motor inertia ratio exceeds the
indicated value, contact your local sales office.
The values of the permissible load to motor inertia ratio in the table are the values at the maximum rotation
speed of the servo motor. The value in the parenthesis shows the value at the rated speed.
Servo motor
Permissible load to motor inertia
ratio [multiplier]
LE-T6-
□
LE-T7-
□
30
LE-T8-
□
LE-T9-
□
T9
T8
T7
T5
T6

SMC Networks LECSN-T Series Specifications

General

Brand	SMC Networks
Model	LECSN-T Series
Category	Controller
Language	English