Fuji Electric ALPHA7, User Manual

Page: 239 / 662

CHAPTER 4 PARAMETER
4-48
Automatic Operation Setting Parameters
4
PA2_10 Homing direction after reference signal detection
No. Name Setting range
Default
value
Change
10 Homing direction after
reference signal detection
0: Forward rotation
1: Reverse rotation
0 Power
Specify the direction of the zero position when viewed from the reference signal for shift operation. The
reference signal for shift operation is passed during home position shift unit amount travel in this
direction.

If +OT, -OT, or stopper is set for the homing reference signal, this parameter will be disabled, and the
direction opposite to that of the set OT signal or detected stopper will be the homing direction.
Furthermore, this parameter will also be disabled if "Encode Z-phase" is selected for the homing
reference signal, and the homing direction will be the homing starting direction.
The definition of the direction of motion is shown below.
Forward: direction of position increase Reverse: direction of position decrease
PA2_11 Reference signal for shift operation
No. Name Setting range
Default
value
Change
11
Reference signal for shift
operation
0: Home position LS
1: Encoder Z-phase
2: +OT 3:-OT 4: Interrupt input
5: Stopper
1 Power
Specify the signal serving as a standard of the home position.
The position of a travel from the specified reference signal toward the homing direction after reference
signal detection by the home position shift unit amount is the home position.
The home position accuracy (reproducibility of zero position) is the highest with 3 (encoder Z-phase).
If the Z-phase is selected, the reference signal for shift operation (deceleration starting signal) can be
installed.
Next to the encoder Z-phase, 4 (interrupt input) has the highest home position accuracy (reproducibility
of zero position). This is because 4 (interrupt input) detects the interrupt position with a signal while 0
(home position LS), 2 (+OT) and 3 (-OT) detects a level.

If one among 0 (home position LS), 2 (+OT) and 3 (-OT) is selected, there is an error of ±250 [pulses]
in the zero position at a creep speed for homing of 50 [r/min].
Home position shift unit
amount
+OT
-OT
Interrupt
input
Encoder Z-phase
Home
position LS
Reference signal for
shift operation
Reverse Forward
Reference signal for
shift operation +OT
-OT