Table of Contents - TG Drives

EXTENDED REGISTER GROUPS
RD2, Resolver/Digital converter #2
RD2, RESOLVER/DIGITAL CONVERTER #2
Group Group
No
Description
RD2 3 Resolver/Digital converter #2. Normally used as the
master position in the gearbox mode, otherwise free
to use by the PL program.
RD2, GENERAL
The RD2 group contains registers for control and monitoring of the Resolver 2
input, which is used primary for gearbox functions. The second resolver (RD2) can
be an external resolver mounted on a machine axis or it can also be the resolver
on another DMC 2 -controlled motor. In that case the clocks of the two DMC 2 ’s must
be synchronized.
An external resolver must have equal or lower transformation ratio than RD1. The
external resolver is supplied with the same excitation frequency as the RD1. In
both cases the outputs are two AM signals which represents the sine and cosine of
the angular position at all times. These analog signals are sampled and converted
at a constant rate (4 kHz). From the sine and cosine values, the angle can be
calculated as arctan(sine/cosine).
From this periodic angle measurement, the speed and position of the RD2 can be
derived.
Resolver Resolver speed High resolution Mode Standard Mode
PPR PPR
2-Pole 1-Speed resolver 65536 8192
4-Pole 2-Speed resolver 131072 16384
6-Pole 3-Speed resolver 196608 24576
8-Pole 4-Speed resolver 262144 32768
FUNCTION
RD2.Mode Selects mode of operation for the resolver interface.
RD2.Mode = 0 Turns off the resolver and reset RD2.Pos.
RD2.Mode = 1 The normal setting for standard resolvers. Other value
enables special functions.
RD2.SHAdj Compensates for phase shift in the resolver and cables. The
synchronous demodulation principle of the resolver interface
requires that this parameter is set to a proper value. A span
of +/- 150 is sufficient for all types of resolvers. A measuring
routine (PL2 coded) for this parameter is included in the SW
package.
RD2.Pos Can be used as the input for gearbox functions. The
RD2.Pos is an absolute position axis related to the position
the resolver had when it was initialized.
RD2.Mode = 16 High-resolution mode.
User's Manual 5.1 Inmotion Technologies AB
Doc. No.9032 0027 01 (B), Rev. 11.07.2001
63