bnp-b2365(eng)b.pdf - 第193页

3. Setup 3 - 106 (4) Adjusting the A phase and B phase outpu t signal [1] Set the drive unit in the open loop operation stat e. (Set the spindle parameter SP038/bitF to "1" and turn the NC power ON again.) T he…

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3. Setup
3 - 105
(2) Adjusting the gap
[1] Confirm that the detection gears are not rotating. The sensor could be damaged if the gap is
adjusted while the gears are rotating.
[2] Loosen the sensor fixing screw with the sensor fixed on the sensor installation seat.
[3] Using a clearance gauge, adjust so that the gap between the sensor detection surface and the
detection gears' circumference is 0.15±0.01mm.
[4] The sensor can be moved up and down or turned when the sensor fixing screw is loosened.
Position the rotating direction to match the marking line drawn on the sensor and installation
seat.
[5] When done adjusting the gap, apply a locking agent on the sensor fixing screw, and then fix
the sensor.
[6] After fixing the sensor, check the gap again. If operation is carried out with an excessively
small gap, the sensor and gears could contact, and the sensor could be damaged.
[7] Faults could occur if an excessive external force is applied or if the sensor detection surface is
damaged.
(3) Checking the A phase and B phase output signal
Check the output signal waveform by measuring the signals of the check terminals on the PCB
with the DC range of the synchroscope.
A phase output signal........ Across A-G
B phase output signal........ Across B-G
The PLG reference speed when confirming the output signal waveform differs according to the
number of output pulses. Refer to the following table for the reference speed for each number of
pulses. If operation is not possible at the reference speed, operate at a low speed within the range
in which the waveform can be confirmed.
Check terminal function
Reference speed for A and B p hase output signal confirmation
Check
terminal
Signal name
Number of detection
gear teeth
Number of A and B
phase pulses
Reference speed for
signal confirmation
A A phase 128 128 3600 r/min
B B phase 180 180 2500 r/min
Z Z phase 256 256 1800 r/min
G Ground 512 512 1200 r/min
The output signal waveform is confirmed when the motor is run in the forward direction and reverse
direction. The rotation directions are defined below.
During forward run ... When the detection gears are rotating in the clockwise direction looking
from the sensor lead side.
During reverse run ... When the detection gears are rotating in the counterclockwise direction
looking from the sensor lead side.
The normal A and B phase output signal waveform when running at the reference speed is shown
below. If the output signal waveform is not as shown below, refer to the next section "(4) Adjusting
the A and B phase output signal" and adjust.
A pha se/B phase output signal waveform
during forward run
A pha se/B phase output signal waveform
during reverse run
A phase
B
p
hase
1.45 ~ 1.55
Volta
g
e
[
V
]
-1.45 ~ -1.55
0
Time
A
p
haseB
p
hase
1.37 ~ 1.63
Volta
g
e
[
V
]
-1.37 ~ -1.63
0
Time
3. Setup
3 - 106
(4) Adjusting the A phase and B phase output signal
[1] Set the drive unit in the open loop operation state. (Set the spindle parameter SP038/bitF to
"1" and turn the NC power ON again.) There are cases when sudden speed changes cannot
be followed during open loop operation, so gradually change the speed command.
[2] Forward run the motor and rotate the PLG at the reference speed.
[3] Using the PCB volume VR1 to VR4, adjust so that the A phase and B phase signals are within
the specified range. If the correct waveform cannot be attained even after adjusting with VR1
to VR4, adjust the gap again.
[4] Reverse run the motor and rotate the PLG at the reference speed.
[5] Adjust the output waveform by adjusting VR1 to VR4 in the same manner.
VR1
VR2
VR4
VR3
VR5
G
B
A
Z
PCB section
[6] Set the drive unit to the closed loop operation state (normal operation).
[7] Run the motor at the maximum speed, and confirm that the A phase and B phase output
voltage peak value is larger than 0.8V on both the plus side and minus side during both
forward run and reverse run.
[8] Run the motor at the reference speed, and confirm that the A phase and B phase output signal
envelope is 0.4V or less.
The envelope is calculated by the expression below.
(Envelope) = (Maximum amplitude α) - (Minimum amplitude β)
[9] If the envelope is larger than the designated value, the deflection of the detection gears' outer
diameter may be large, so check the deflection.
Example of A phase/B phase signal waveform
during forward run at maximum speed
Definition of envelope
Volume function
Check
terminal
Signal name
VR1 A phase offset adjustment
VR2 A phase gain adjustment
VR3 B phase offset adjustment
VR4 B phase gain adjustment
VR5
Z phase pulse width adjustment
(Already adjusted before shipment)
A phase
B
p
hase
0.8
Voltage [V]
-0.8
0
Time
Voltage [V]
0
Time
Minimum am
p
litude:
β
Maximum am
p
litude: α
3. Setup
3 - 107
(5) Confirming the Z phase pulse width
Check the output signal waveform by measuring the signals of the check terminals on the PCB
with the DC range of the synchroscope.
A phase output signal........ Across A-G
Z phase output signal........ Across Z-G
The output signal waveform is confirmed during motor forward run and reverse run. Set the
synchroscope as follows to measure the waveform during each run direction.
During forward run ............ Apply a trigger at the rising edge of the Z phase output signal
During reverse run ............ Apply a trigger at the falling edge of the Z phase output signal
Confirm that the Z phase pulse width (time that the Z phase signal is at the "H" level = approx. 15V)
is 40% or more and 60% or less, when one cycle of the A phase signal is calculated as 100%. The
normal Z phase output signal waveform when run at the reference speed is shown below. If the
output signal waveform is not as shown below, refer to the next section "(6) Adjusting the Z phase
pulse width" and adjust.
The Z phase pulse width has been adjusted at shipment, with a combination of the sensor section
and PCB section having the same serial No. Thus, it normally does not need to be adjusted. If a
sensor section and PCB section having different serial numbers must be used, causing the Z
phase pulse width to deviate from the specified range, carry out the adjustment.
A pha se/Z phas e outpu t signal waveform
during forward run
A phase/Z phase output signal waveform
during reverse run
(6) Adjusting the Z phase pulse width
The Z phase pulse width can be adjusted with potentiometer VR5 on the PCB. VR5 is fixed after it
has been tested and adjusted to match the sensor section and PCB section having the same serial
No., so do not turn it unless a sensor section and PCB section with different serial numbers must
be used.
A phase
0V
One A
p
hase c
y
cle = 100%
R
p
oint
Z phase pulse width: 40 to 60%
A
pply a trigger at the falling
edge of the Z phase
H level (reference
volta
g
e +15V
)
L level
Z phase
A phase
0V
One A
p
hase c
y
cle = 100%
Q
p
oint
A
pply a trigger at the rising
edge of the Z phase
H level (reference
volta
g
e +15V
)
L level
Z
p
hase
Z phase pulse width: 40 to 60%