Lenze DSD - Manual (Page 359)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
359
11 Drive Dimensioning
11.7 Motor components
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Features of feedback systems
The feedback systems listed in the table differ from each other with regard to the position recogni-
tion after the supply voltage is switched off.
• For synchronous motors the rotor position information is required for switch-on. For this, the ro-
tor position within a motor revolution has to be given. This can be implemented with the fol-
lowing feedback systems:
• Resolver
• Sin/cos encoders (singleturn and multiturn)
• If the current position has to be known for positioning purposes after connecting the drive sys-
tem, the following is suitable:
• Resolvers, sin/cos encoders and SSI absolute value encoders (singleturn) for motors without
gearbox for representing a revolution.
• Sin/cos encoders and SSI absolute value encoders (multiturn) for representing several motor
revolutions.
• TTL encoders and HTL encoders do not contain any position information and thus are a reason-
ably priced solution for asynchronous machines.

Note!
Please observe that some inverters require certain additional components.
If required, also the limit frequency of the frequency input has to be taken into consider-
ation.
The dimensioning criterion for the feedback systems is their accuracy. This is not taken
into consideration by the DSD.
• Accuracy improves in the order: resolver, incremental encoder, SinCos encoder.
• A higher pulse rate of the incremental encoders also produces a higher accuracy.