Filter
Top Products
3. Setup
3 - 108
(7) Checking the Z phase and A phase difference
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
The phase difference for the Z phase signal and A phase signal is defined as follows.
During forward run ....... Time difference between Z phase output signal rising edge and A
phase output signal zero point (Q point)
During reverse run ....... Time difference between Z phase output signal falling edge and A
phase output signal's 1/2 cycle point (R point)
Confirm that the phase difference between the Z phase to the A phase is within ±25% during both
forward and reverse run when one cycle of the A phase signal is calculated as100%. If the output
signal waveform is not as shown below, refer to the next section "(8) Adjusting the Z phase and A
phase difference" and adjust.
Confirming the Z phase signal phase difference
during forward run
Confirming the Z phase signal phase difference
during reverse run
One A
p
hase c
y
cle = 100%
One A
p
hase c
y
cle = 100%
Phase difference of
A
phase and Z phase
Tolerable
range of phase
difference
±
25%
Phase difference of A phase and Z phase
Tolerable
range of phase
difference
±
25%
A phase
0V
R
p
oint
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
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