Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 125)

Rockwell Automation Publication 7000-IN006B-EN-P - May 2013 121
General Reference Appendix A
Table 9 - 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.
PowerFlex 7000 Drive
Performance (Torque
Capabilities) The PowerFlex 7000 drives have been tested on a dynamometer to verify
performance under locked rotor, accelerating, and low speed-high torque
conditions. Table A-5 below shows the PowerFlex 7000 drive torque capabilities
as a percent of motor rated torque, independent of the drive’s momentary
overload conditions.
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