Rockwell Automation 2092-DAx Ultra1500 User Manual - Manual (Page 105)

Publication 2092-UM001D-EN-P — July 2005
Ultra1500 Application Examples 5-25
The maximum electrical frequency can be expressed as follows:
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.
ω
E
V
Max
2
π
60
------
⋅
P 2
⁄
------------------------- = rotary motors
( )
ω
E
V
Max
2
π
D
------
⋅
= linear motors
( )