Stopping Profiles - Allen-Bradley Ultra1500 2092-DA1 User Manual

The maximum electrical frequency can be expressed as follows:
V
Max
ω
------------------------ -
=
P 2 ⁄
E
ω
= V
E Max
where:
P = pole count of the motor
D = electrical cycle length of the motor in meters.
If the drive detects that the stopping current is excessive, the drive-motor
match fault will be displayed when a Drive Enable is attempted:

Stopping Profiles

Figure 5.8 depicts calculated stopping profiles for TL-Series motors when used
with the Ultra1500. If the load: motor inertia ratio is greater than 10:1, the
stopping time will be longer and additional heating will occur in the drive.
Repetitive stopping rates should not exceed one stop every 5 minutes. A brief
flurry of 2–3 stops within a minute will not damage the drive, as long as the
inertia ratio is less than 10:1 and an adequate period of time with no stopping
follows.
Ultra1500 Application Examples
2π
⋅
----- -
60
(
rotary motors
2π
⋅ (
----- -
linear motors
D
Publication 2092-UM001D-EN-P — July 2005
5-25
)
)