Fuji Electric ALPHA5 Smart, User Manual

Page: 216 / 636

CHAPTER 4 PARAMETER
4-48
Automatic Operation Setting Parameter
4
PA2_17 Home position detection range
No. Name Setting range
Default
value
Change
17
Home position detection
range 0: Always ON after homing completion
1 to 2000000000 [units]
0 Always
Not a compulsory item
Specify the range in which the homing completion signal is turned on.
If the current position is between the positive home position detection range and negative home
position detection range around the home position, homing completion is turned on.
Specify 0 to always turn the homing completion signal on after a homing is finished.
The zero position is not necessarily 0. The home position is the position specified as a home position
after homing completion (PA2_16) or preset position (PA2_19).
PA2_18 Deceleration time at OT during homing
No. Name Setting range
Default
value
Change
18
Deceleration time at OT
during homing
0.0 to 99999.9 [ms] 100.0 Always
Specify the deceleration time taken after +OT or -OT is detected during homing motion.
Specify the time taken to decelerate from 2000 to 0 r/min. Determine the setting under consideration of
the homing speed and moving range after the OT sensor. (“0.7” in the equation indicates the safety
factor.)
[Example of calculation of reference value]
Moving range after OT × 0.7 = Homing speed × Reduction ratio × Ball screw lead
× (Homing speed/2000 r/min × Deceleration time after homing OT/1000/60) × 1/2
30 mm ×0.7 = 1000.00 r/min × (1/5) × 20 mm
× (1000.00 /2000 r/min × Deceleration time at OT during homing /1000/60) × 1/2
Deceleration time at OT during homing = 1260.0 ms

If 1 (stop) is selected with parameter
PA2_24 (selection of operation at
OT during homing), stoppage occurs
according to parameter PA2_60
(third torque limit). In this case, the
homing motion is stopped upon
detection of OT.
+OT -OT
OFF ON OFF
Home position detection range Home position detection range
Homing completion
Home position
The acceleration time and deceleration time
are based on 2000 r/min.
Homing speed
Speed
Time
+OT OFF ON ON
+
-
Deceleration time at homing OT
Acceleration time 1 or
acceleration time 2
+OT and -OT are
generally normally
closed contact signals.