Mitsubishi Electric MELSEC Q Series User Manual page 281

(6) Drive unit (servo amplifier)
A generic term for drive units that support analog voltage inputs. The commands that are output from the
QD73A1 are low voltage. This unit is used to amplify the energy and activate a motor. The unit, also called a
servo amplifier, is an accessory on a servomotor.
(7) Pulse generator
A device that generates pulses. For example, by attaching this device on a motor axis, pulses can be generated
by the rotation of the axis.
(8) Feedback pulse
Pulses that are fed back from the encoder to the QD73A1 according to the motor's actual rotation amount
(rotation degree)
(9) Deviation counter
A counter that counts up and down the difference between the number of command pulses and feedback pulses.
The difference between command pulses and feedback pulses are accumulated in the deviation counter as
"accumulated pulses". The number of accumulated pulses in the deviation counter becomes "0" when positioning
is completed.
(10)Zero signal
PG0 of a pulse generator (encoder), that is detected once in one rotation
(11)Workpiece
A generic term for various objects being controlled, including moving objects such as tools
APPENDICES
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