MNALAZIN-02
10
Products and System Requirements / Feedback Supported
commutation state (see
Table 2.4
above) which is a valid state in 60‐degree phasing.
Connect only two of the motor output wires, Motor A and Motor B.
or:
•
Tie one of the Hall Sensor inputs on the AZ drive to signal ground. Since the Hall Sensor
inputs are by default internally brought high to +5V, this will put the AZ drive in a
commutation state where two Hall inputs are high, and one is low (as shown in
Table 2.4
,
having all three Hall inputs pulled high is an invalid commutation state in 120‐degree
phasing). Depending on which Hall Sensor input is tied to ground, consult
Table 2.4
above
to determine which two motor output wires will be conducting current for that specific
commutation state.
FIGURE 2.3
Encoder Feedback Signals
Encoder-A
Encoder-B
Encoder-A
Encoder-B
Example 1: Encoder-A precedes
Encoder-B. The pulses arrive at
a certain frequency, providing
speed and directional
information to the drive.
Example 2: Encoder-B precedes
Encoder-A, meaning the direction
is opposite from Example 1. The
signal frequency is also higher,
meaning the speed is greater
than in Example 1.
Encoder Feedback
AZBExxA8 drives utilize two single‐ended incremental encoder inputs for velocity control. The
encoder provides incremental position feedback that can be extrapolated into very precise
velocity information. The encoder signals are read as "pulses" that the AZ drive uses to
essentially keep track of the motor’s position and direction of rotation. Based on the speed and
order in which these pulses are received from the two encoder signals, the drive can interpret
the motor velocity. The diagram below represents encoder "pulse" signals, showing how
dependent on which signal is read first and at what frequency the "pulses" arrive, the speed
and direction of the motor shaft can be extrapolated.
Tachometer Feedback
AZBExxA8 and AZBHxxA8 drives offer the option of using a DC Tachometer for velocity control.
The tachometer provides an analog DC voltage feedback signal that is related to the actual
motor speed and direction. The drive subsequently adjusts the output current based on the
error between the tachometer feedback and the input command voltage. The maximum range
of the tachometer feedback signal is ±60 VDC.
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