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1SFC132104M0201 | Application manual: Waste water pump | Connection 11 3.2.3 Connecting Start and Stop terminals to push buttons and PLC Internal control voltage - Push buttons The PSTX Softstarter has a built-in holding circuit and does not require sustained signals on start input. Use internal control supply voltage from terminals 20 or 21. Connect start and stop terminals using conventional circuit with push buttons. See Figure 6 and Figure 7. Connect the white start push button as START and the black stop push button as STOP in Figure 7. Tightening torques and cable dimensions. 0,2 .. 2,5 mm 2 2x0,2 .. 1,5 mm 2 0,2 .. 2,5 mm 2 2x0,2 .. 1,5 mm 2 AWG 12 ... 24 0,5 Nm 4,3 lb.in 3,5 x 0,6 mm (0.138 x 0.024 in) M3 L 100-250V 50/60 Hz K4 K5 K6 Start Stop In0 In1 In2 GND +24V N 1SFC132081M0201 External control voltage - PLC The softstarter can, if required, also be controlled with an external 24 V DC source from a PLC or similar. Connect the cables according to Figure 8 depending on which type of control method is used. WARNING Terminal 13, 14 ,15, 16 and 17 should be connected using 24V DC only. Other voltages may damage the softstarter and the warranty may no longer be valid. Tightening torques and cable dimensions. 0,2 .. 2,5 mm 2 2x0,2 .. 1,5 mm 2 0,2 .. 2,5 mm 2 2x0,2 .. 1,5 mm 2 AWG 12 ... 24 0,5 Nm 4,3 lb.in 3,5 x 0,6 mm (0.138 x 0.024 in) M3 L 100-250V 50/60 Hz K4 K5 K6 Stop In0 In1 In2 GND +24V N 1SFC132081M0201 Figure 6: Start and Stop, terminals 13, 14, 18, 19, 20, 21 6 1SFC132081M0201 7 PSTX L 100-250V 50/60Hz K4 K5 K6 Start Stop In0 In1 In2 DGND GND +24V N STOP START 1SFC132081M0201 Figure 7: Holding circuit (pulse for start is enough) 8 PSTX L 100-250V 50/60Hz K4 K5 K6 Start Stop In1 In2 DGND +24V N DC + - 1SFC132081M0201 In0 GND STOP START Figure 8: Holding circuit with external control voltage (pulse for start is enough) 2