Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors User Manual

Page 104

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4 Operation

4.2.5 Encoder Output Pulse

4-14

When Passing 1st

Zero Point in Forward Direction and Returning after Power ON

After the power is turned on, the phase-C pulse (CN1-21, CN1-22) is output when the linear scale moves for-

ward and its detection head first passes the phase-C detection position. After the detection head of the linear
scale passes the detection position in a forward direction, the phase-C pulse is output when the head passes the

position regardless of the direction of the linear scale’s movement.

When Passing 1st

Zero Point in Reverse Direction and Returning after Power ON

After the power is turned on, the phase-C pulse (CN1-21, CN1-22) is not output when the linear scale moves
reverse and its head first passes the phase-C detection position. The phase-C pulse is output for the first time

when the linear scale moves forward and its head passes the detection position. After the detection head of the

linear scale first passes the detection position in the forward direction, the phase-C pulse is output when the
head passes the position regardless of the direction of the linear scale’s movement.

Scale count-up direction

Phase-C detection position

Power ON

Time

Phase-C pulse output

The phase-C pulse is also output when the detection head of the linear scale passes
this point in reverse, because the SERVOPACK has recorded the position
where the phase-C pulse was originally output when first passing the position in the forward direction.

The phase-C pulse is not output
when passing the detection position
in reverse direction first.

The phase-C pulse is also output when passing this point in reverse,
because the SERVOPACK has recorded the position where the phase-C pulse was
originally output when first passing the position in the forward direction.