Installation Manual

Startup
52 9000X AF Drives MN04001004E—May 2011 www.eaton.com
Hint for the 9000X Drive User:
When zero point voltage is set correctly, run motor with slow
ramp (~20s) to 1/2 of rated frequency. Show output
frequency and motor current in the 9000X drive monitoring
window. If midpoint parameters are set correctly, motor
current should be stable during acceleration.
(heavy solid line in figure below).
If there is a peak in the monitored motor current (heavy
dashed line in figure below), check what the output
frequency is at the maximum current point, and set this value
for midpoint frequency (P1.6.6). Then readjust midpoint
voltage for a stable current performance during acceleration.
Motor Current after V/f Curve Tuning
V/f Midpoint
Voltage P1.6.7
Practical Compromise
Ideal
With Linear V/f
l
d
1 Hz
f
V/f Midpoint
Frequency P1.6.6
2–3 x Slip Freq.