Chapter 2 Installation and Wiring
2.3 Wiring
The wiring ofmotor soft startershould be operated only by professionals
experienced in highand low voltageelectric circuit andshould read this
manual in detailbefore wiring.
2.3.1 Standard Wiring Diagram
Basic Wiring
Diagram
Circuit Breaker
(MCCB) or Leakage
Circuit Breaker
ELCB
Main Circuit
Bypass Magnetic Contactor
Full VoltageOutput
Delay Output
(Programmable)
Failure Output
Control Circuit
RS485 COM
Analog Output
DC 0-20mA
Instantaneous Stop
Stop
Start
Common Port
Chapter 2 Installation and Wiring
2.3.2 Description of Main Circuit Terminals
TerminalMark TerminalName Functional Description
Main Circuit InputTerminal
Main Circuit OutputTerminal
Bypass Connection
Ground Terminal
Connect to three-phaseinput power
supply.
Connect to three-phaseelectric motor.
Connect to bypasscontactor
Soft starter cabinetground terminal
1 Input Terminals (R, S,T)
Three-phase input power supply should be connected to the input terminals R, S
and T of the motor soft starter after it goes through the circuit breaker. Three-phase
power supply doesnot differ on phase sequence and can be arbitrarily connected.
While wiring, DOconnect three-phase input power supply to the terminals R, S
and T. Otherwise, itmay result in severe damage to the motor soft starter.
It is recommendednot to shutdown the machine by disconnecting the main circuit
power supply orinstall an electromagnetic contactor between the input terminals R,
S, T and the power supply to run or stop the motor soft starter. Do selectRUN or
STOP keys on the operation panel or external control terminals to run or stopthe
motor soft starter.
2 Output Terminals (U, V, W)
The output terminals U, Vand W should be connected to the three-phase motor. If
the motor counterrotates (reverses), just change arbitrarily two phases of U, V and
W.
Do not installa capacitor orsurge absorber betweenthe output terminals U, V, W
and the three-phasemotor. Otherwise,it may result in failure of the motor soft
starter or damageto the devices.
Too long connectingline between the motor and the motor soft starter may result
in overcurrent trip,increase of cutoff current, lowaccuracy of current display of the
motor soft starter. So, it is suggested to use a line not exceeding 50m.
3) Bypass Connection(L21, L22, L23)
The bypass connectionterminals L21, L22and L23 should be connected to the
electromagnetic contactor.No wrong connectionor incorrect phase sequence!
When the startingof the softstarter is finished, the main loop power device (SCR)
will log outand the bypasselectromagnetic contactor willrun simultaneously. At this
time, the motoris brought intonormal service.
4) Ground Terminal ( G)
The ground terminalof motor softstarter should be properly connected to the
ground to avoidelectric shock orfire. The ground wire cannot share a ground point
with any otherstrong current load.They must be connected respectively, and the
ground wire isthe shorter thebetter
