Sln: 3-wire control/Sin, FWD: Forward running,
REV: Reverse running
3: 3-wire control 2; This mode defines Sin as
enabling terminal. The running command is
generated by FWD or REV, and they control the
running direction. During running, the terminal Sin
should be closed, and terminal FWD or REV
generates a rising edge signal to control the
running and direction of inverter; the inverter
should be stopped by disconnecting terminal Sin.