Mitsubishi MELSEC-A series User Manual

3. SPECJFtCATlONS /MELSEC-A
Zeroing data is explained below:
(1 Zeroing direction
Specifies the direction for zeroing.
IMPORTANT 1
Zetoing is controlled according to the zeroing direction and
speed. Deceleration is started when an actuator is operated.
Always ensure that the zeroing direction is correct for the
drive system used.
(2) Zeroing methods
Zero the system using one of the following methods, all methods
require a "zeroing dog" or actuator to reduce the speed to the creep
speed.
a) Zero-phase signal from pulse generator (PG)
b) Stop and dwell timer time-out
c) Stop and signal from drive unit
(a) Zero-phase signal from PG
The sequence of events is as follows (See Fig. 3.1 1):
0 Zeroing signal received - move in appropriate direction,
0 "Zeroing dog" on - start decceleration to creep speed.
0 "Zeroing dog" off - continue at creep speed.
0 Zero phase signal - stop drive, zeroing complete.
I J Actuator signal starts deceleration.
Creep apead
I I I\
"Zeroing dog"
Drift (axording to drive unit)
I Zero-phase signal
U
u Adjust tha actuator so that its OFF
U
zerophme
signal.
position
is
near the center of the
'////////////// Torque limit valid range
Fig. 3.11 Zeroing Using a Zero-Phase Encoder and an Actuator (method a1
1
i
8
i

Mitsubishi MELSEC-A series Specifications

General

Brand	Mitsubishi
Model	MELSEC-A series
Category	Controller
Language	English