The sync link is a fast data link between two converters, and it is used for resolver sharing and syncing the switching frequency. The sync signal is very susceptible to electromagnetic interference (EMI), and thus a proper hardware implementation is crucial.
Requirements for the SYNC cable:
- The maximum length for the sync cable is 0.5 m.
- The cable must be a one piece, direct cable from one inverter to the other without any junction blocks, terminals, or other connections in between.
- The cable must be well shielded.
- The shield must be connected from both ends to ENC_GND (pin 35) or directly to the enclosure of the inverter.
- SYNC A and SYNC B wires must be twisted together.
- There must be an additional ground wire inside the same shield that is connected to one of the GND pins (15,17, or 30) in both inverters.
- If a 2x2 multipair cable is used, it is best to connect the other pair together and use it as a GND cable. Leaving the fourth wire not connected (floating) reduces the EMI protection.
For information regarding the configuration of inverter parameters regarding the SYNC link, see the article SYNC link configuration.