SMAC
LAC-26 Technical Reference Manual
4/29/2013 67
DZ drives can also use encoder feedback for sinusoidal commutation by using the AutoCommutation
routine in DriveWare. Encoder feedback is also used in the "Phase Detect" procedure in DriveWare, which
is necessary when using a three phase (brushless) motor without Hall Sensors. The Phase Detect routine
will have to be run before AutoCommutation. Phase Detect works by sending a small current signal to the
motor, prompting the motor to vibrate slightly for a few seconds. The encoder feedback from this
movement provides a starting position for the motor, allowing the drive to then be properly commutated.
See the Driveware Software Guide for more information on Phase Detect.
The high resolution of motor mounted encoders allows for excellent velocity and position control and
smooth motion at all speeds. Encoder feedback should be used for applications requiring precise and
accurate velocity and position control, and is especially useful in
Note applications where low-speed smoothness is the objective.
5.2.8 ±10 VDC Position
DZ drives accept an analog ±10 VDC Position feedback, typically in the form of a load-mounted
potentiometer. The feedback signal must be conditioned so that the voltage does not exceed ±10 V, and is
connected to the DZ drive through the Programmable Analog Input. In
DriveWare, the connection method that is used must be selected under the Position Loop
Feedback options. See the DriveWare Software Guide for more information.
When using the Programmable Analog Input for ±10 VDC Position feedback, the drive cannot use a ±10V
Analog input command through the reference inputs. See the Command Sources section below for other
available types of command inputs.
5.3 Command Sources
The input command source for DZ drives can be provided by one of the following options.
5.3.1 ±10V Analog
Both DZC and DZR drives accept a differential or single-ended analog signal with a range of ±10 V from an
external source. The input command signals should be connected to pins P1-3 and P1-4. See
“Programmable Analog Input” on page 42 for more information.
5.3.2 Encoder Following
Both DZC and DZR drives can utilize Encoder Following as a form of input command. In Encoder
Following mode, an auxiliary differential encoder signal can be used to command the drive in a
master/slave configuration. The gearing ratio (input counts to output counts ratio) can be configured in
DriveWare by the user. Encoder Following is only a valid option when the DZ drive is operated in position
mode. The auxiliary encoder signal input should be connected to pins P1- 17, P1- 18, P1-19, and P1-20.
See “Auxiliary Encoder Input” on page 42 for more information.