8 SM-Resolver User Guide
www.controltechniques.com Issue Number: 4
3.3 Set-up parameters
All parameters associated to the SM-Resolver can be found in either menu 15, 16, or
17. Each of menus 15, 16, and 17 refer to one of the available slots into which the SM-
Resolver can be fitted. See Figure 4-1 on page 11.
3.4 Compatible resolver types
The SM-Resolver will allow for resolvers with the following specification to be used with
the Unidrive SP:
Input impedance: >85Ω at 6kHz
Turns ratio: 3:1 or 2:1 (input : output)
Number of poles: 2, 4, 6 or 8
Suitable resolvers from CT Dynamics are frames sizes 55RSS and 80RS.
3.4.1 SM-Resolver excitation output
Output wave form: either 6kHz 6V rms sine wave (turns ratio = 3:1)
or 6kHz 4V rms sine wave (turns ratio = 2:1)
3.4.2 SM-Resolver inputs
Input voltage: 2V rms
If the number of poles of the resolver is not 2, then the resolver can only work with a
motor that has the same number of poles (e.g. a 6 pole resolver with a 6 pole motor).
A 4-pole resolver will give two electrical cycles within one mechanical revolution.
Therefore, a 4-pole resolver cannot provide absolute position (mechanical). Similarly, a
6-pole or 8-pole resolver cannot provide absolute position (mechanical).
NOTE
NOTE
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