Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 137)

Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013 137
Detail Drive Configuration and Operation Chapter 1
Speed Trim 1
At this point in the speed reference control loop, parameter 21 [Speed Trim 1] is
added to the speed reference. By default, [Speed Trim 1] is linked to the output of
the Process PI loop. The resulting parameter 47 [Spd Trim1 SpdRef ] is sent into
the speed regulator loop.
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 [Motor Fdbk Sel] selects the feedback device for motor speed and
position feedback. The possible settings for [Motor Fdbk Sel] are:
• 0 - “Encoder 0"
• 1 - “Encoder 1"
• 2 - “Sensorless”
• 3 - “Reserved” (this setting is not used)
• 4 - “Motor Sim”
• 5 - “FB Opt Port0”
• 6 - “FB Opt Port1”
Parameter 223 [Mtr Fdbk Alt Sel] 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 possible settings for [Motor Fdbk Sel].
Speed regulation with a Feedback Sensor: 0.001% of Top Speed over a 100:1
Speed Range
Speed regulation sensorless: 0.5% of Top Speed Over a 120:1 typical Speed
Range
Encoder
There are two encoder inputs on the standard I/O board of the PowerFlex 700S.
They are located at TB2 - Row T (Top) and TB2 - Row B (Bottom). The
encoder inputs are rated for Incremental, Dual Channel Quadrature type,
+
21
47
180
Spd Trim1 SpdRef
Speed Trim 1 from Process
Control
Link
to Speed Control
- Regulator
PI Output