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