Home Position Return - Mitsubishi Electric MELSEC Q Series Programming Manual

6 POSITIONING CONTROL

6.23 Home Position Return

Home position return Reference
methods position
Proximity
dog
Proximity
method 1
dog
Proximity
method Motor zero
dog
method 2
Count
method 1
Count
Count Command
method
method 2 position
Count Motor zero
method 3
Data set Command
method 1 position
Data set
method
Data set Motor actual
method 2 position
Motor zero
Dog cradle method
Stopper
Stopper method 1 Motor actual
method position
Stopper
method 2
(1) Use the home position return at the power supply ON and other times where
decision of axis is at the machine home position is required.
(2) The home position return data must be set for each axis to execute the home
position return.
(3) The home position return methods that are available are proximity dog method,
count method, data set method, dog cradle method, stopper method, limit switch
combined method, scale home position signal detection method, dogless home
position signal reference method, and driver home position return method. Select
the optimal home position return method for the system configuration and
applications with reference to the following.
External signal
point
DOG
(FLS/RLS)
point
—
DOG
point (FLS/RLS)
DOG
—
• It is used in the system which can surely pass a zero point from the
home position return start to proximity dog ON
• When the proximity dog is ON, it cannot be started.
• This method is valid when the stroke range is short and "proximity dog
method 1" cannot be used.
• When the proximity dog is ON, it cannot be started.
• It is used in the system which can surely pass a zero point from the
home position return start to point of travel distance set as "travel value
after proximity dog ON".
• This method is used when the proximity dog is near the stroke end and
the stroke range is narrow.
• This method is valid when the stroke range is short and "count method
1" cannot be used.
• It is used in a system where external input signals such as dog signal
are not set in the absolute position system.
• This method is valid for the data set independent of a deviation counter
value.
• It is used in a system where external input signals such as dog signal
are not set in the absolute position system.
• Home position is zero point of servo motor immediately after the
proximity dog signal ON.
• It is easy to set the position of proximity dog, because the proximity dog
is set near the position made to the home position.
• This method is valid to improve home position accuracy in order to
make the home position for the position which stopped the machine by
the stopper.
6 - 198
Applications
OFF.