Basic wiring of motor STR soft starter
schematic diagram of soft starter is also called basic wiring diagram and basic wiring diagram, as shown in the figure. The symbols, names, descriptions, etc. of the external terminals in the figure are shown in the table
table STR soft starter terminal symbol description
symbol terminal name Description main circuit R, s, t AC power input terminal is connected to three-phase AC power supply u, V, w through circuit breaker (QF), soft starter output terminal is connected to three-phase asynchronous motor U1, V1, W1 external bypass contactor special terminal, special for B series, A series without this terminal control circuit
Digital
input
run external control start terminal run and com can be short circuited to external start stop external control stop terminal stop and com can be short circuited to external stop jog external control jog terminal jog and com can be short circuited to realize jog NC empty terminal expansion function with com external digital signal common terminal internal power reference point digital 2018 new testing machine model development p>
output
+12v internal power supply terminal The metric and imperial system in the subsystem can be switched; Partial output power supply, 12V, 50mA, DCOC startup completion, OC gate conduction after terminal startup completion, (DC 30v/100ma) com external digital signal common terminal internal power reference point continued table
symbol terminal name description control circuit
relay
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output
K14 dynamic closing fault output terminal failure, k14-k12 closed. Fetscher added that k11-k12 disconnected
contact capacity ac:10a/250v dc:10a/30v
K11 dynamic breaking K12 public K24 dynamic closing external bypass contactor control terminal
after starting, k24-k22 closed, k21-k22 disconnected
contact capacity ac:10a/250v or 5a/380v
K21 action Disconnect K22 common
figure basic wiring diagram of STR soft starter
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