Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 128)

128 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
Speed/Position Feedback The speed feedback block selects the feedback device and scales the feedback
signal. This section will describe in detail how each of these functions operates.
Feedback Device
Parameter 222 [Mtr Fdbk Sel Pri] selects the primary feedback device for motor
speed and position feedback. The possible settings for [Mtr Fdbk Sel Pri] are:
• 0 - “Encoder 0”
• 1 - “Encoder 1”
• 2 - “Sensorless”
• 4 - “Motor Sim”
• 5 - “FB Opt Port0”
Parameter 223 [Mtr Fdbk Sel Alt] selects an alternate feedback device when a
feedback loss is detected on the primary device. The possible settings for [Mtr
Fdbk Alt Sel] are the same as the settings for [Mtr Fdbk Sel Pri].
Encoder
There is one standard encoder input. A second encoder input board is optional.
The encoder inputs are rated for Incremental, Dual Channel Quadrature type,
Isolated with differential transmitter output (Line Drive).
The encoder inputs can accept 5V DC or 12V DC (selected via dip switches).
There is a encoder supply on the drive that can be set for 5V DC or 12V DC via
dip switches. 12V DC is the default setting.
An encoder offers good performance for both speed and torque regulation
applications. Encoder feedback is required for applications with high bandwidth
response, tight speed regulation, torque regulation of (+/- 2%) or when the
motor is required to operate at less than 1/120th of its' base speed.