Curtiss-Wright | GSM Series Rev. U PN29959 3/28/17
6
Each amplifier has specific requirements for the feedback on the
motor. Not all encoder-based amplifiers can use the same encoder,
encoder alignment or relative direction of encoder rotation.
Many amplifiers offer software that allows the entering of parameters
or the downloading of motor data files that dictate how the feedback
must be set up on the motor. Exlar can provide many of these data files
or the proper parameters to enter. Entering motor parameter data to
some amplifiers may require assistance from the amplifier manufacturer.
Feedback Alignment
When Exlar manufactures a GSM Series actuator, the proper
feedback is selected, mounted, aligned and test run on the amplifier that
the customer plans to use, or one that is known to be equivalent for
confirming proper feedback alignment and operation. In any case where
it is determined that the feedback has become misaligned, or an
amplifier change is made requiring the feedback to be aligned differently,
it is recommended that Exlar be contacted and arrangements made to
have that procedure performed.
Feedback Wiring
The wiring of the feedback device is critical to the operation of the
actuator with the selected amplifier. Wiring the feedback cable
improperly can cause unstable operation, incorrect operation or no
operation at all. In some cases, if the proper current limits are not set in
the amplifier, improper wiring of the feedback cable can lead to damage
of the motor.
Encoders
An incremental encoder is an electronic rotary device that transmits a
string of electrical pulses when rotated. Most brushless motors or servo
systems that use incremental encoders use what is called a quadrature
encoder. Typical brushless motor encoders use two data channels,
labeled A&B, to provide direction, velocity and position information. The
Channel labeled I or Z has one pulse per revolution and is called the
index. The channels labeled as hall signals, or commutation signals, are
typically labeled S1, S2 & S3; Hall 1, 2 & 3, or Hall A, B & C, depending
on the manufacturer's conventions. These signals give the amplifier the
commutation information that it needs to properly rotate the motor.
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