7
Motion Commands
7.2.3
Zero Point Return (ZRET)
7-16
7.2.3 Zero Point Return (ZRET)
When the Zero Point Return command (ZRET) is executed, the axis will return to the zero point of
the machine coordinate system.
The operation to detect the position of the zero point is different between an absolute encoder and an
incremental encoder.

The SVR supports only absolute encoders.
With an absolute encoder, positioning is performed to the zero point of the machine coordinate sys-
tem and command execution is completed.
With an incremental encoder, there are 13 different methods (see below) that can be performed for
the zero point return operation.
( 1 ) Selecting the Zero Point Return Method (with an Incremental Encoder)
When an incremental encoder is selected for the Encoder Type by fixed parameter No. 30 to 0, the
coordinate system data will be lost when the power supply is turned OFF. This command must be
executed when the power supply is turned ON again to establish a new coordinate system.
The following table lists the 13 zero point return methods that are supported by the MP2300. Select
the best method for the machine according to the setting parameters. Refer to the page in the Table
under Details for additional command information.
îš„
Terminology: Pulse distribution
Pulse distribution transfers reference values from the MP2300 registers to the SERVOPACK registers every
scan. Used in describing motion command operation.
R
Setting
Parameter
OW

3C
Name Method Signal Meaning
Reference
Page
0 DEC1 + Phase-C
Applies a 3-step deceleration method
using the deceleration limit switch and
phase-C pulse.
DEC1 signal: SERVOPACK DEC signal 7-20
1 ZERO signal Uses the ZERO signal. ZERO signal: SERVOPACK EXT1 signal 7-22
2
DEC 1 + ZERO
signal
Applies a 3-step deceleration method
using the deceleration limit switch and
ZERO signal.
DEC1 signal: SERVOPACK DEC signal
ZERO signal: SERVOPACK EXT1 signal
7-23
3 Phase-C Uses the phase-C pulse. − 7-24
4 to 10 Not used −− −
11 C pulse Only Uses only the phase-C pulse. − 7-25
12 POT & C pulse
Uses the positive overtravel signal and
phase-C pulse.
POT: SERVOPACK P-OT signal 7-26
13 POT Only Uses only the positive overtravel signal.
POT: SERVOPACK P-OT signal
This method must not be used if repeat
accuracy is required.
7-27
14 Home LS & C pulse Uses the home signal and phase-C pulse. HOME: SERVOPACK EXT1 signal 7-28
15 Home LS Only Uses only the home signal. HOME: SERVOPACK EXT1 signal 7-30
16 NOT & C pulse
Uses the negative overtravel signal and
phase-C pulse.
NOT: SERVOPACK N-OT signal 7-31
17 NOT Only Uses only the negative overtravel signal.
NOT: SERVOPACK N-OT signal
This method must not be used if repeat
accuracy is required.
7-32
18 INPUT & C pulse
Uses the INPUT signal and phase-C
pulse.
INPUT: Setting parameter OB

05B
7-33
19 INPUT Only Uses only the INPUT signal.
With this method, a zero point return can be
performed without connecting an external
signal using setting parameter OB

05B.
This method must not be used if repeat
accuracy is required.
7-35
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