Rockwell Automation GV3000/SE AC Gen. Purpose and Vector Drive Software Start-Up and Ref. Manual - Manual (Page 155)

Programming Reference 4-69
If an encoder is used, select the PPR based on a 125 kHz maximum input frequency
limitation. The encoder PPR selection affects the minimum and the maximum
operation speed in RPM and also affects the speed range.
The maximum input frequency can be calculated by the formula:
Fmax = U.017 x U.001
60
where Fmax is the maximum frequency in pulses per second.
If U.001= SE, the drive operates using sensorless vector control (SVC). Unless
specified, all vector parameters apply to SVC. Refer also to the following parameters
which specifically support SVC:
• U.022 Motor Nameplate Horsepower
• U.023 Low Bus Fault Avoidance Enable
• U.030 SVC Slip Adjust
• U.031 SVC Sync Direction
• U.032 SVC Flux Current Regulator Gain
U.001 Encoder PPR
This parameter
selects the number of
pulses per revolution
(PPR) of the encoder
being used or selects
sensorless vector
control (SVC) if no
encoder is used.
If SE is not selected,
the value of this
parameter is
automatically set
when self-tuning
(U.008) is successful.
Parameter Range: 512 = 512 PPR
1024 = 1024 PPR
2048 = 2048 PPR
4096 = 4096 PPR
SE = No encoder connected. Operate in sensorless
vector control (SVC).
Default Setting: 1024
Parameter Type: Configurable
Refer also to parameters: U.008 Torque Self-Tune Enable
!
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.