3. ELECTRICAL INSTALLATION 37
Resolver Interface Specification
12 bit A to D input 4096 resolution
incremental resolution 5.3arc mins /increment averaged over 1 rev
absolute accuracy better than +/-30arc mins.
Resolver set up
For a resolver feedback motor the torque vector is set correctly as soon as power is applied
to the drive. The resolver excitation remains active whilst the drive is powered to ensure that
the resolver feedback system is calibrated ready for use.
Encoder Compatibility
Devices supported: RENCO, Tamagawa
Signal format: quadrature 5V differential signals (A+, A-, B+, B-), Index mark Z+, Z-*
Max input frequency: hardware limit 400KHz max. for A or B channel (1.6MHz post
quadrature).
Definition of positive motion: A leads B when producing clock-wise motion as viewed at the
motor output shaft.
Resolution: 500 to 5000 line devices supported (2000 to 20000 resolution).
Commutation set up
On energising the drive the commutation encoder input is captured and the torque vector set
to be at the middle of the commutation segment..
Whilst rotating as soon as a commutation encoder edge is observed, the torque vector is
realigned more accurately . After the first commutation edge is observed the commutation
input channels are ignored. Prior to passing a commutation input edge the torque may be
restricted to 87% of the peak torque available.
For a rotary motor more accurate alignment is made to the index mark. As soon as the
index mark (Z input) is observed for the first time the torque vector is again more accurately
set. If the Z mark is seen before the first commutation encoder edge the torque vector is set
accurately and subsequent commutation transitions ignored
The above sequence of torque vector alignment is restarted on cycling through de-
energising and energising the drive.
A Hall Effect commutation encoder signals are also used (refer to Appendix B for
commutation details).
Following Encoder
Hardware limit 2.0MHz maximum A/B channel input frequency, (8MHz post quadrature).
5V differential.
Primary/Secondary Encoder 5V Supply
X2 pin 5, X4 pin5.
Maximum loading 350mA TOTAL, using the above connections.
Summary of Contents for ViX250AE
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