Semiconductor soft starter 3RW3 8.3.7 Timing diagram Starting and coasting response The following diagram shows the changeover times during switching on and off: L1-L2-L3 A1-A2 IN Bypass T1-T2-T3 U N U S Changeover delay approx. 30 ms On delay approx. 80 ms ON Changeover delay approx. 30 ms ON command Fig. 8-19: Starting and coasting response Line discontinuity in the bypassed state If the load voltage is switched off in the bypassed state while the auxiliary voltage is still applied to the terminals A1/A2, the soft starter starts the motor directly after reactivation of the load voltage. To avoid this, the On command must be withdrawn when the main voltage disappears.
The following graphic elucidates the response to a line discontinuity in the bypassed state: L1-L2-L3 A1-A2 IN Bypass T1-T2-T3 U Direct starting U To avoid direct starting after the main voltage returns, the On command must be withdrawn on disappearance of the main voltage (Toff >= xx ms) Start command Main voltage returns Fig. 8-20: Line discontinuity in the bypassed state 8-32 Stand 08/99 OFF command Activation of control volta the ge Activation of main voltage the