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Coretec BS Series - 8 Concept of Stroke; Semi Closed Loop; Direction; System Home Position

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BS Controller for AC SERVO PRESS
Instruction Manual Ver1.08
BS-M3A-1B
- 36 -
8.
Concept of stroke
When using the Servo press, an incorrect setting of stroke will cause a
serious accident.Please be sure to understand concept of stroke well before
using the servo press. then design user programs, sequence, and system
after that.
8.1.
Semi closed loop
The stroke value of a servo press is calculated from the encoder pulse of a
motor, and may not show the exact position of the ram always.
The right stroke value cannot be outputted before an origin return.
In proportion to load, a tool is distorted slightly. It is about 0.3mm at the
maximum load
When the mechanism of a timing belt or others breaks down, the actual
position and stroke value of the ram are-less correlating.
When the position of the ram has serious influence for operation of a system ,
we recommend you to form the sensor which detects the position of the ram
uniquely.
8.2.
Direction
The direction where ram is extended is the direction of +.
8.3.
System home position
It is used when adjusting offset of the whole system. It is set as a controller
using BS Configurator. When tools are exchanged, adjustment of an
attachment position can be easily performed by change of a system home
position.
8.4.
User home position
It is the offset which can be arbitrarily set up in a user program. It specifies
using a home position table. It is set up on the basis of a system home position.
The stroke value of 32 pieces is prepared for the home position table. The
contents of a home position table can be changed by BS Configurator.
The stroke value treated in a user program starts from a user home position.
8.5.
System stroke limit
It is the maximum stroke value set to the tool table.*1 A setup can be
arbitrarily changed in the range exceeding it. The stroke value starts from an
origin sensor.
8.6.
User stroke limit
It is the stroke limit which can be described in a user program. The stroke

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