Speed Control, Mode, Regulation & Vector Speed Feedback 2-169
Process PI – See Process PI Loop on page 2-137
Encoder
There is (1) encoder input on the I/O board of the PowerFlex 700VC. The
encoder input must be line driver type, quadrature (dual channel) or pulse
(single channel). The encoder input accepts 8 or 12V DC encoder signals.
There is a 12V DC supply on the drive that can be used to supply power for
the encoders.
An encoder offers the best 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 1/120
th
its’ base
speed.
[Motor Fdbk Type] selects the type of encoder:
• “Quadrature” – dual channel.
• “Quad Check” – dual channel and detects loss of encoder signal when
using differential inputs.
• “Single Chan” – pulse type, single channel.
• “Single Check” – pulse type, single channel and detects loss of encoder
signal when using differential inputs.
[Encoder PPR] sets the number of encoder pulses per revolution.
[Enc Position Fdbk] displays the raw encoder count. For single channel
encoders, this count will increase (per rev.) by the amount in [Encoder
PPR]. For quadrature encoders this count will increase by 4 times the
amount defined in [Encoder PPR].
PowerFlex
Drive
PowerFlex
Drive
PowerFlex
Drive
PowerFlex
Drive
#1 #2 #4
5/40
#3
Dough Stress
Relief
Cookie Line
CUTTERS OVEN
Vector
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