SinCos
ADC
digital encoder
digital I/O
Quadrature
sync
latch
MCU sample
latch
16 kHz (62.5 µs)
latch
MCU sample
MCU sample (node) frequency 8 kHz (125 µs)
PVL (on drive)
PVL (on drive)
sync
(Note 1)
Fig. 13-3:
Relation of MCU sample, PVL sample and encoder data (PVL on
drive @ 16 kHz)
The moment that the PVL on the drive module starts depends on the
configured position encoder. If a SinCos-based encoder is used, the PVL can
start before the end of the sync packet. If a digital encoder is used the PVL
starts as soon as the position data becomes available, see
of MCU sample, PVL sample and encoder data (PVL on drive @ 32 kHz)" on
fig. 13-3 "Relation of MCU sample, PVL sample and encoder
data (PVL on drive @ 16 kHz)" on page 161
.
You can also use the PVL on the MCU. If you use the PVL on the MCU, keep
the following in mind.
●
The PVL on the drive module defines the latch frequency. Even when
the PVL runs on the MCU, the latch frequency is the PVL frequency of
the drive module.
●
The PVL on the drive module adds dithering and the test signal to the
controller out signal.
●
The PVL on the drive module is the only component that communicates
information to the CCL.
The PVL on the MCU always starts after the end of the sync packet, see
13-4 "Timing relation of MCU sample, PVL sample, encoder information (PVL
SinCos
PVL (on MCU)
ADC
digital encoder
digital I/O
Quadrature
sync
latch
MCU sample
latch
latch
latch
32 kHz (31.25 µs)
latch
MCU sample
MCU sample (node) frequency 8 kHz (125 µs)
sync
(Note 1)
(Note 2)
PVL (on drive)
PVL (on drive)
PVL (on drive)
PVL (on drive)
Fig. 13-4:
Timing relation of MCU sample, PVL sample, encoder information
(PVL on MCU)
The PVL (on the drive module) frequency can be set to 4, 8, 16, or 32 kHz.
The sample frequency, also called the node frequency can be set to 1, 2, 4,
or 8 kHz.
Note that, depending on the selected node (sample) frequency and the PVL
(on the drive module) frequency, several PVL (on the drive module) sample
cycles are executed in one MCU sample. For example, if the sample
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Encoders
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