Rockwell Automation 7000 PowerFlex Medium Voltage Air-Cooled (B Frame) Installation - ForGe Control User Manual
Page 75

Rockwell Automation Publication 7000-IN007E-EN-P - June 2014
75
General Reference
Appendix A
Table 11 - PowerFlex Speed Regulation
Notes:
•
Speed regulation is based on a percentage of motor synchronous speed.
•
Encoder to be mounted on the AC machine
•
Operational 15V DC Power Supply mounted in drive to power the
encoder as a standard option with the encoder feed back card.
•
Customer is responsible for providing and mounting of encoder
•
Sleeve bearing motors require the encoder to have an axial movement
tolerance.
•
Recommended encoders are shaft mounting type.
•
Magneto resistive models are more adaptable to harsh environments.
•
When installing, the encoder body and electronics must be isolated from
ground (options available from the encoder manufacturer to accomplish
this).
•
There are usually limits on encoder cable lengths. Ensure the maximum
length is suitable for the application.
Encoder
Frequency Output
<6 Hz
6...15 Hz
>15 Hz
Without Encoder
Not applicable
0.1%
0.1%
With Encoder
0.02%
0.01%
0.01%
With Encoder and HPTC
mode enabled
0.01%
0.01%
0.01%
Table 12 - Encoder Selection
High Performance
Torque Control (HPTC)
Mode
Motor RPM
Minimum Tach PPR
Recommended Tach PPR
3600
1024
1024
3000
1024
1024
1800
1024
2048
1500
1024
2048
1200
2048
2048
1000
2048
2048
900
2048
4096
720
4096
4096
600
4096
4096
450
4096
8192
360
8192
8192
300
8192
8192