Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 257)

Rockwell Automation Publication 7000-UM151E-EN-P - January 2013 257
General Reference Appendix A
Table 11 - PowerFlex Speed Regulation
Notes:
• Speed regulation is based on a percentage of motor synchronous speed.
• Tachometer to be mounted on the AC machine
• Operational 15 V DC Power Supply mounted in drive to power the
tachometer as a standard option with the tachometer feed back card.
• Customer is responsible for providing and mounting of tachometer
• Sleeve bearing motors require the tachometer to have an axial movement
tolerance.
• Recommended tachometers are shaft mounting type.
• Magneto resistive models are more adaptable to harsh environments.
• When installing, the tachometer body and electronics must be isolated
from ground (options available from the tachometer manufacturer to
accomplish this).
• There are usually limits on tachometer cable lengths. Ensure the maximum
length is suitable for the application.
Tachometer Frequency Output
<6 Hz 6-15 Hz >15 Hz
Without Tachometer Not applicable 0.1% 0.1%
With Tachometer 0.02% 0.01% 0.01%
Recommended Tach PPR
Motor RPM Tach ppr
3600 600
3000 600
1800 1024
1500 1024
1200 2048
1000 2048
900 2048
720 2048
600 2048