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System Overview IP 266
The linear axis
A linear axis is an axis with a limited traversing range. The traversing range is
restricted via
programmable software limit switches (S
A
/S
E
)
hardware limit switches (H
A
/H
E
)
emergency limit switches (N
A
/N
E
)
Fig. 1-2. Linear Axis with Range Limit Switches (not to scale)
Start of
machine
End of
machine
Table
N
A
/N
E
: Emergency start/end (power section)
H
A
/H
E
: Hardware limit switch start/end
S
A
/S
E
: Software limit switch start/end
Deceleration distance S
Br
Clearance distance X
N
A
H
A
S
A
S
E
H
E
N
E
Traversing range
The software limit switches do not go into force until the reference point has
been determined (see Section 5.3.5).
The distance between the software limit switches and the hardware limit
switches must be such that the drive can be decelerated at the specified dece-
leration rate before it reaches the hardware limit switches. In addition to dece-
leration distance S
BR
, you must also maintain a clearance distance (X) between
the end of the deceleration distance and the next limit switch.
The same applies to the distance between the hardware limit switches and the
emergency limit switches.
C A U T I O N :
Incorrect initialization of the limit switches may result in mechanical damage.
Always make sure that you observe the clearance distance (X).
1-4
EWA 4NEB 812 6057-02
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