Rockwell Automation SA500 Drive Configuration and Programming - Manual (Page 103)

SA500 Local Tunable Variables B-1
A
PPENDIX
B
SA500 Local Tunable Variables
Resolver Balance and Gain Variables
The resolver gain and balance variable values are used to compensate for varying
lengths of resolver wiring. The balance value can be generated automatically by
commanding the resolver calibration test in register 101/1101. The gain value will be
generated automatically when the RES_GAN% variable is equal to zero, i.e., on
power-up. Refer to the SA500 Power Module instruction manual (S-3018) for more
information on the calibration procedure.
Note that Distributed Power Systems are designed to be used with the resolvers
described in S-3018 and listed in chapter 2 of this manual. The validity of the results of
these calibration procedures are not guaranteed if resolvers other than those
described are used.
Figure B.1 – Capacitance Used for Resolver Balancing
RES_BAL% Resolver Balance
The RES_BAL% local tunable contains the
amount of capacitance that is to be added to
the sine or cosine channel of the resolver to
compensate for stray inductance in the wiring. 8QLWV S) ∗
'HIDXOW 9DOXH
/RZ /LPLW
+LJK /LPLW
6WHS
This value may range from 0 to 79, with 0 indicating that balance tuning has not
been performed. Values from 1 to 39 add capacitance to the cosine channel, while
values from 41 to 79 add capacitance to the sine channel. Each integer value
represents 100 pF as shown in figure B.1.
Added to Cosine Channel Added to Sine Channel
3900 pF 100 pF 0 pF 100 pF 3900 pF
0 1 39 40 41 79
Tuning
Not Done