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series low voltage soft starters ,intelligent economic soft start,designed for use with three phase induction motors - details see: https://www.machineto.com/digital-motor-voltage-soft-starters-10236066

Digital Motor Voltage Soft Starters

The HPS2DB softatrter is a highly sophisticated and reliable starter designed for use with standard three-phase, three-wire, squirrel cage induction motors. It provides the best method of reducing current and torque during motor starting.

The optional RS 485 Communication with MODBUS protocol enables full control (Start, Stop, Dual Adjust, command, etc.) and supervision. Up to 32 starters can be connected

on a shield twisted pair to a host computer.

Starting & Stopping :
Prior to Installation
Check that Motor's Full Load Ampere is lower than or equal to the starters Full Load Current and that Main and Control voltages are as indicated on the front panel.
Mounting
The starter must be mounted vertically, allow sufficient space above and below the starter for suitable airflow.
It is recommended to mount the starter directly on the rear metal plate for better heat dissipation.
Do not mount the starter near heat sources.
Protect the starter from dust and corrosive atmospheres.
Temp. Range and Heat Dissipation
The starter is rated to operate over a temperature range of -10ºC
(14ºF) to + 50ºC (122ºF). Relative noncondensed humidity inside the enclosure should not exceed 95%.
Starter's heat dissipation is approx. 3 x In (three times the current in watts).
Example: For a 100A motor, heat dissipation is approx. 300
watts.Internal enclosure heating can be reduced through the use of:
a. Additional ventilation
b. Employing a by-pass contactor.
Short Circuit Protection
Protect the starter against a short circuit by Thyristor Protection Fuses.

Control Terminals:

Terminals 1-2Control supply
110-120Vac or 220-240Vac, 50/60Hz
Terminal 3Ground
Terminal 4Start Signal Input:
Input form a N.O contact. To start the motor,connect common terminal (Terminal 6) to Terminal 4 for at least 500mSecs.
Terminal 5 Soft Start Signal Input:
Input form a N.C contact. To soft stop the motor,disconnect common terminal
( Terminal 6 ) to Terminal 5 for at least 500mSecs.
Terminal 6Common Terminal,Common for terminals 4,5
Terminals 7-8Programmable Signal Relay,Programmable function:
Run Relay(Normal Open):
Changes its position when starter running(Start/Soft Stop process or Motor running).
Over Current Fault Relay(Normal Close):
Changes its position on Over Current Fault.
Terminals 9-10By-pass relay, changes its position at the end of Acceleration
Terminals 11-12Programmable Fault Relay,changes its position on fault, the contact is programmable to function as Normal Open or Normal Close relay
Option Module

3) Field Bus Communication Connector:
Modbus protocolCode AStandard RS485,Half duplex with Modbus protocol,baud rate 1200,2400,4800,9600 BPS
Profibus protocol (Code B)
DeviceNet protocol (Code C)
RS232C (Code D)Starter control program on-line update

4) Analogue Signal Ouput: Analogue value is related to motor cuurent and operation supply
voltage.