Rockwell Automation GV3000/SE AC Gen. Purpose & Vector Bookshelf Drive Start-Up and Reference Manual - Manual (Page 156)

4-70 GV3000/SE AC Bookshelf Drive Software Reference, Version 6.06
Important: Verify that the value in U.017 (Motor Top Speed) is correct if U.002 is
changed.
If the number of poles is unknown, this value can be calculated using data on the
motor nameplate as follows:
Step 1. Calculate the RPM value at 60 Hz as follows:
RPM @ 60 Hz = 60 x Nameplate RPM (U.005)
Nameplate Base Freq. (Hz.) (U.003)
Step 2. Determine the number of motor poles by looking up the value computed for
RPM @ 60 Hz:
Range of RPM @ 60 Hz
1
Number of Poles
3240 to 3600 2
1620 to 1800 4
1080 to 1200 6
810 to 900 8
If you change this parameter after performing self-tuning using parameter U.008, you
must repeat the self-tuning procedure
U.002 Motor Poles
This parameter
identifies the number
of poles in the motor.
This parameter must
be entered before
parameter U.005
(Motor Nameplate
RPM). Parameter
U.005 is limited by
the number of motor
poles entered into
parameter U.002.
Parameter Range: 2 = 2 poles
4 = 4 poles
6 = 6 poles
8 = 8 poles
Default Setting: 4
Parameter Type: Configurable
Refer also to parameters: U.003 Motor Nameplate Base Frequency
U.005 Motor Nameplate RPM
!
ATTENTION: The setting of parameters U.001 (Encoder PPR), U.002
(Motor Poles), U.003 (Motor Nameplate Base Frequency), U.005 (Motor
Nameplate RPM), and U.017 (Motor Top Speed) determines the motor
maximum speed. These parameters must be set by a qualified person
who understands the significance of setting them accurately. Failure to
observe this precaution could result in bodily injury.
ATTENTION: Do not use a 4096 PPR encoder with a 2-pole motor.
Overspeed and motor damage can result. Failure to observe this
precaution could result in bodily injury.
1 Reliance RPM AC motors are 4-pole regardless of motor base RPM.