The configuration shows a crane topology with three AC/AC single‑drives. It is especially important to note that the crane can be controlled by just using the onboard I/O of the SINAMICS Control Unit. For hoist applications, an encoder is requested for safety reasons and for providing pendulum length to cross travel (trolley) and long travel (gantry). For insure the sway control performance, encoders for trolley and gantry are recommended.

Topology of mid‑performance OHBC crane with three AC/AC single-drives