Yaskawa Varispeed 626M5 - Manual (Page 242)

Specifications
14.2.7 Encoders
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14.2.7 Encoders
A magnetic encoder that uses a magnetic disk is used as the motor speed detector. If there is a home position
signal, three detection signals are used: Two 1024 P/R AB phase signals, and one P/R home position pulse
signal. If using a main axis drive with a machine-tool, the signal resolution is the same as the main axis
encoder, and in machinery where the motor axis and main axis correspond 1:1, the motor encoder can be
used as the main axis encoder. The relationship between the encoder configuration and the output phase
during forward rotation is shown in the following diagram.
Magnetic
drum
Shaft
Magnetic sensor (magnetic
resistance element)
N
S
N
N
S
N
S
N
S
S
N A
B
C
N
S
Fig 14.11 Encoder Configuration
A phase
(PA)
B phase
(PB)
C phase
(PC)
90°
Forward rotation
Fig 14.12 Output Phases (Forward Rotation)
14