YASKAWA SGD7S-****20A Series Product Manual page 210

Output Phase Forms
Forward rotation or movement
(phase B leads by 90°)
90°
Pha e A
Pha e B
Pha e C
Note: The pulse width of the origin within one encoder rotation depends on the setting of number of encoder output
pulses (Pn212) or the encoder output resolution (Pn281). It is the same as the width of phase A.
Even for reverse operation (Pn000 = n.1), the output phase form is the same as shown above.
If you use the SERVOPACK's phase-C pulse output for an origin return, rotate the Servomotor
two or more rotations before you start an origin return. If the Servomotor cannot be rotated two
or more times, perform an origin return operation at a motor speed of 600 min
Important
motor speed is higher than 600 min
Linear Encoder Application Precautions
The following precautions apply to the encoder output pulses when an external linear encoder
is used.
 Relation between Renishaw PLC Incremental Linear Encoders and
Encoder Output Pulse Signal from the SERVOPACK When Using a
RGS20 Scale and RGH22B Sensor Head
The output position of the origin signal (Ref) will depend on the direction of movement for some
models of incremental linear encoders from Renishaw PLC.
In that case, the phase-C pulse of the SERVOPACK is output at two positions.
For detailed specifications on the origin signal, refer to the manual for the Renishaw PLC incre-
mental linear encoder.
 When Passing the First Origin Signal (Ref) in the Forward Direction and Returning
after Turning ON the Power Supply
Machine po ition (forward)
Origin detection
po ition
Origin detection
po ition
Power ON
Origin ignal (Ref)
Pha e C
 When Passing the First Origin Signal (Ref) in the Reverse Direction and Returning
after Turning ON the Power Supply
Machine po ition (forward)
Origin detection
po ition
Origin detection
po ition
Power ON
Origin ignal (Ref)
Pha e C
Reverse rotation or movement
(phase A leads by 90°)
Pha e A
Pha e B
Pha e C
t
-1
, the phase-C pulse may not be output correctly.
6.5 Encoder Divided Pulse Output
6.5.1 Encoder Divided Pulse Output Signals
90°
t
-1
No origin ignal (Ref) i output by the incremental linear
encoder. However, a pha e-C pul e will be output from the
ERVOPACK when the motor move in the rever e
direction, becau e thi i the ame po ition from which a
pha e-C pul e wa output when the motor moved in the
forward direction.
Time
The econd pul e i half a
wide a the pha e-A pul e.
No origin ignal (Ref) i output by the incremental linear
encoder. However, a pha e-C pul e will be output from the
ERVOPACK when the motor move in the forward
direction, becau e thi i the ame po ition from which a
pha e-C pul e wa output when the motor moved in the
rever e direction.
Time
The econd pul e i half a
wide a the pha e-A pul e.
or lower. If the
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