GSK 980TC3 Series, Manual

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GSK980TC3 Series Bus Turning CNC system PLC, Installation and Connection User Manual
178
Inst
allation
and
Connection
Ⅳ
4.8 Mechanical Zero Return (Machine Zero Return)
The concept of mechanical zero point(machine zero point)
The machine coordinate system is the fixed one on the machine. And the origin of the machine
coordinate system is called as the mechanical zero point (or the machine zero point). In this
manual, it is also called as the reference point, and always installed in the maximum limit of X,Y
4
TH
and 5
TH
axes. After the machine is designed, manufactured and adjusted, the machine is
set up and fixed. However, after CNC power on, there isn’t the mechanical zero point, and the
zero point is obtained in AUTO or JOG mode.
There are two types of zero return:1. after a block; 2. before a block, which are set by bit
parameter N0: 6#1.
There are two types of zero return:1. with one-turn signal; 2. without one-turn signal, which are
set by bit parameter N0: 6#6.
During zero return, if there isn’t one-turn signal in the motor, zero mode type is classified as type
A or B, which are set by bit parameter N0:6#7.
4.8.1 Bus Servo Zero Return Function Setting
When the system is allocated with a bus servo, there are two kind of zero return mode:
incremental zero return and absolute setting zero, which is introduced as follows:
1. Incremental zero return
Set to select the incremental in
【
BUS
】
’s encoder type or set the bit parameter No
：
20#4=0. The
system executes zero return according to the common zero return mode, i.e., select one-rotation
signal or no one-rotation signal zero return mode, which mode is used in the system allocated with
GE2000 series incremental mode’s version. Zero return’ each axis in zero return mode is valid.