Manual – IPOSplus®
123
12
P90x IPOS reference travel
P9xx IPOS Parameters
12
P9xx IPOS Parameters
12.1 P90x IPOS reference travel
Reference travel is used to establish a
machine zero
to which all absolute positioning
commands refer. It is possible to select from various strategies, referred to as reference
travel strategies P903 Reference travel type (page 124). These strategies define appro-
priate travel modes, for example to search for a reference cam. Using the
reference
point
determined by reference travel, the machine zero point can be changed using
P900 Reference offset (page 123) according to the following equation:
Machine zero = reference po reference offset
The speeds of the travel movements required on the basis of the
reference travel type
are set using P901 Reference speed 1 (page 124) and P902 Reference speed 2
(page 124).
Display range: Number of increments between leaving the reference cam and reaching
the zero pulse of the encoder set in P941.
The value is displayed after the reference travel. Ideally, it should be half the encoder
resolution (after quadruple evaluation). Relocate the cam if necessary.
12.1.1 P900 Reference offset
Setting range: –(2
31
–1) – 0 – 2
31
–1
Reference offset (zero offset) is used to determine the machine zero (origin). The follow-
ing applies:
Machine zero = reference po reference offset
The reference offset always refers to the encoder set via P941 Source actual position
(page 134).
This encoder can be a motor encoder, an external encoder or a DIP encoder. The cor-
responding actual positions are indicated by IPOS
plus®
variables.
• H509 Actual position DIP encoder
• H510 Actual position external encoder
• H511 Actual position motor encoder
DANGER
Risk of crushing if the motor starts up unintentionally.
Severe or fatal injuries.
•
Ensure that the motor cannot start unintentionally.
•
Note that modifying these parameters without knowledge of the IPOS
plus®
program, which may be
active, can cause unexpected movements and place unwanted loads on the mechanical driveline. It is
essential that you are familiar with the IPOS
plus®
manual to make the setting for these parameters.
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