STO Mid-level Soft Starter

3 Phase, 3 Wire Connection, 48A to 200A
Adjustable Dials On The Front Panel
Internal Electronic Overload Relay
USB Device & Modbus RTU

 

The STO is a cost effective solution to drive three phase squirrel cage induction motors and is available in 3x FLC*, 3.5x FLC, 4x FLC and 4.5x FLC formats and 7 sizes from 48A to 200A. With rotary adjustments on the front, you can change function values such as Initial Voltage, Start Ramp Time and Stop Ramp Time, with ease. This Soft Starter also comes with an internal electronic overload relay and a configurable Kick Start (100, 200 or 300 msec). *FLC = full load current.

 

STO_Overview.png

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Overview

  • 3 phase, 3 wire soft starter
  • Current Range - 48A, 60A, 75A, 85A, 100A, 140A, 170A, 200A
  • Supply Voltage: 3 x 200V, 3 x 400V, 3 x 575V +/- 10%
  • Kick Start configured by DIP switch - 100, 200, 300 msec
  • USB device and Modbus RTU on standard models 
  • Software to eliminate motor speed oscillations
  • Electronic Overload Relay for Normal or Heavy Start
  • Internal Bypass Relay Contactor
  • Option to work in continous mode using thyristors only (dis-engage Bypass contactor)
  • Hole mounting from 48A to 200A 
  • Complies with CE EMC regulations
  • Adjustable functions on the front panel of the unit

Start/Stop 

  • Ramp up voltage
  • Ramp up current
  • Ramp down
  • Stop by coasting

Control Mode

  • Internal bypass relay
  • Current limit facility
  • Torque control
  • Constant current control
  • Kick Start: 100, 200 or 300 msec

Protection

  • Start time out of limit
  • Phase loss
  • Motor overload
  • Phase sequence
  • Unbalanced current
  • Power circuit failure
  • Supply frequency out of limits
  • Instantaneous peak current
  • Bypass overload
  • Over voltage
  • Over current
  • Undercurrent protection (pump)
  • Overload relay and curve selection
  • PTC motor termistor
  • Communication failure

Communication

  • Modbus RTU (standard)
  • USB device (standard)
  • Modbus TCP (option)
  • Profibus DP (option)
  • Profinet (option)
  • Devicenet (option)

Environment

  • Protection - IP20
  • Operating temperature: -10 to 60°C max
  • Humidity 5% to 95%
  • Conformal coating (option)

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Technical Information

Soft Starter Selection Sheet

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Installation (Click on images for larger view)

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Documentation

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Videos

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