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Ndrive HL User’s Manual
Options
www.aerotech.com 4-19
4.2. –DUALPSO and –TRIPLEPSO Laser Firing Options
The Ndrive HL allows two and three-axis laser firing with its –DUALPSO and –
TRIPLEPSO options. To accomplish this, the encoder signals from a second/third Ndrive
HL must be connected (or daisy-chained) from that Ndrive HL to the Ndrive HL with the
–DUALPSO or –TRIPLEPSO options. This requires an encoder signal from another axis
via the J205 connector (Section 3.2) or via one of the J302, J303 SSI Net connectors. If
the J205 connector is used, it must be configured as an output via the EncoderDivider
axis parameter. If the SSI Net is used it requires a cable (see Table 4-16 and Figure 4-18)
from J302 to J302 of each Ndrive HL (J302 to J302 or J303 to J303 of the other Ndrive
HL, both connectors each have the same two SSI Net ports present on each connector.
The ports on each drive must then be configured via their PsoSsi1Config/PsoSsi2Config
(or PsoMrk1Config/PsoMrk2Config) axis parameters, out and in, respectively, so the
encoder signals are supplied to the Ndrive HL with the –DUALPSO or –TRIPLEPSO
options. Additionally, the CfgEncMxhSetup axis parameter must be configured for a 20
MHz. clock or less, so as not to exceed the 31 nsec. minimum edge separation
specification. Also, the PSO pre-scalars may be required to limit each encoder being
tracked to a 5 MHz. data rate (which does not affect the servo feedback loop data rate).
The figure below shows two and three-axis firing, which are very similar. See the Nview
HMI help for more information on parameter configurations.
Note that the J205 encoder channel may be configured as an output via the
EncoderDivider axis parameter, allowing other multi-axis PSO firing configurations.
Figure 4-18.
Two / Three Axis Laser Firing Interconnection
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