Semiconductor soft starter 3RW3 Length of the control cable To rule out line coupling capacitance problems, the control line should be shorter than 15 m (basis: units with rated control supply voltage UC 24 V up to 50 m). UmCoupling elements must be used to rule out interference in the case of control lines that leave the control cabinet. 8.3.6 Operating messages and fault diagnostics Operating messages LED READY Lit continuously Flashing Ready during starting or coasting LED BYPASSED Lit continuously Bypassed Tabelle 8-13: Operating messages of the 3RW30/31 Fault diagnostics Tabelle 8-14: Fault diagnostics 3RW30/31 Rev.
08/99 8-31 Malfunction Possible cause Remedy LED READY off • Supply voltage too low • Check and adapt supply voltage at A1, A2 No reaction to con- trol input IN (LED READY on) • No line voltage • Check fuses or line contactor • Phase failure • Check fuses or line contactor • Check voltages L1 to L3 • Wrong line switched to IN • Connect IN as depicted for connection terminals • No load • Connect motor Motor starts directly (LED BYPASSED on) • Switch the line voltage off and on again during continuous operation without actuating the control input IN • Always switch the line contactor on and off in conjunction with the control input IN