Ndrive HP Options
Ndrive HP 10/20/30 User’s Manual
4-24 www.aerotech.com
4.4.1. Resolver/Inductosyn Setup
There are three fundamental steps of configuring the RDP option board:
•
Configuring the Resolver Hardware
•
Configuring the Resolver’s Analog Feedback Signals
•
Configuring the Commutation Parameters
4.4.1.1. Configuring the Hardware
There is a limited amount of hardware configuration capability on the RDP option board.
Most of which is configured at the factory (i.e., must be ordered as a factory option).
These features include carrier frequency and the number of R/D converter channels, one
or two.
There are two jumpers located on the RDP board. These
are used to select the reference signal for the converter
chip (i.e. SIN vs. COS). Jumper JP1 selects the reference
for channel 1 and jumper JP2 selects the reference for
channel 2.
NOTE
: Typically these jumpers only require
being changed when inductosyns are used.
The SIN reference is a fixed-phase signal, which is in phase with the reference signal
used by the resolver. The COS reference is a variable-phase signal which may be phased
shifted with respect to the reference of the resolver/inductosyn to optimize the alignment
of the feedback (required for inductosyns, which nominally provide a 90 degree phase
shift on feedback; optional for resolvers with significant phase loss). The default phase
offset is 90 degrees. For most inductosyns, this value will need to be varied from system
to system to optimize performance. See Figure 4-22 below for example phasing.
Note that some Aerotech systems may have an optional
pre-amplifier board. This may be installed within the
mechanics itself, as is the case with an Aerotech
AOM360D optical mount. If so, the first step is to adjust
the P1 potentiometer on the pre-amplifier board to
equalize the Sine and Cosine feedback signals to the
same amplitude.
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