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Fairford Centris MV Softstarter
Advanced motor control, protection and monitoring in a reliable, field proven soft starter
Fairford Centris MV Softstarter
Advanced Protection - All the features of a motor protection relay without the added cost

Centris - The FAIRFORD Medium Voltage Soft Starter

Centris is the fully featured medium voltage soft start motor controller from Fairford available in the range of 2.3 kV to 15 kV. Centris soft start motor controllers are designed to start AC motors in any fixed speed application. They provide maximum protection with ‘True Thermal Modelling’ while allowing smooth, stepless control of acceleration and deceleration. Centris guarantees power control and protection for your most important assets, vital in an unpredictable world.

Flexible control features and selectable ramping profiles are available to match any application so there is no need to compromise on power. Sealed NEMA 12/IP55 rated enclosures are standard as are built in 120v control power transformers, load-break/fault make disconnect switches, heavy duty SCR assemblies with ring transformer isolation, and line isolation vacuum contactors.

Rated at 500% for 60 seconds, Centris will never be the limiting factor in your application. Powerful sustained gate pulse ensures reliable SCR firing without reactors. High end motor protection, fully rated bypass contactor and fibre optically isolated means the Centris soft starter is the pinnacle of product development.

Peak performance and protection guaranteed from your critical medium voltage equipment, when your motors are protected and controlled by Fairford’s Centris Soft Starters.


Features & Benefits:

True Thermal Modelling
Monitors the motor for excessive thermal conditions due to starting, running and even ambient conditions.

Retentive Thermal Memory
For continuous overload protection even after a complete power loss. When power is restored, the Centris Soft Starter remembers the last thermal condition of the motor, observes the off time via a real-time clock and adjusts the thermal model accordingly.

Non-Volatile Memory
Stores the thermal memory without the need for batteries.

True Time Thermal Tracking
Adjusts the thermal model for different cooling rates based on motor temperature, running state or power loss.

Dynamic Reset Response Reset
Is only allowed after the motor has sufficient thermal capacity for a successful restart.

Thermal Model Biasing
Adjusts for heating effects of phase current imbalance or optional RTD inputs.

Flexible Setup
Choose the level of overload protection.

Programmable Trip Classes
Selectable from IEC/NEMA Classes 5 – 30.

Dual Mode Protection
Separate trip curves for start and run modes (example: Class 20 for start, Class 10 for run).

Warning Levels
Can be programmed and assigned to one of six built-in output relays.

Custom Trip Curve
Programmable based on the motor manufacturer’s data or it can use a “Learned Overload Curve” that reflects normal running condition with a programmable trip bandwidth.

Remote or Automatic Overload Reset
Can be activated for unattended operation


The following is an overview of technical specifications of the Fairford Centris product range:

Type of Load 3-phase medium voltage AC induction or synchronous motors
AC Supply Voltage 2300, 3300, 4160, 6000/7200V, 11-15kV
  VAC +10% to -15%, 50/60 Hz line voltages
HP Ratings Up to 10,000 HP @ 7.2kV (1500 Amps)
  Up to 20,000 HP @ 15kV (800 Amps)
  Contact us for higher rating requirements
Overload Rating AC53b 600-30-60m
BIL Rating 2300V – 7200V 60kV
  11000 – 15000V (110kV)
Transient Voltage Protection dv/dt circuits (1 per SCR pair)
Vacuum Bypass Contactor Standard on all models, line start rated
Ambient Operating Conditions 0 – 50°C (82° F to 122° F)
  5 – 95% relative humidity
  0 – 3300 ft (1000m above sea level without derating)
Digital Control Unit (DCU) Programmable keypad/operator with 2 lines x 20 character backlit LCD display
  Status/Alarm LEDs (indicate: Power, Run, Alarm, Trip, Aux 1 – 8)
Auxiliary Contacts Multiple Form C contacts rated 5A @ 250VAC
  6 fully programmable relays (including fail-safe operation)
  5 dedicated relays (fault, at-speed, etc.)
Programmable Features Motor FLA, service factor, insulation class
  Dual Ramp Adjustments – Two independent settings for:
  – Initial Torque 0 – 100% of nominal torque, voltage or current
  – Current Limit 200 – 600% of motor FLA
  – Acceleration Time 1 – 120 seconds
  Power Ramp Function
  Three Custom Curves Via plotted torque/time axis points
  Pump-Flex™ Deceleration 1 – 60 seconds with begin & end torque adj
  Kick Start 0.1 – 2.0 seconds (10 – 100% voltage)
  Tach Feedback (option) Closed loop speed ramp
Motor and Starter Protection Electronic Overload Phase Loss
  Phase Imbalance Phase Reversal
  Short Circuit Detection Over / Under Current
  Over / Under Voltage Shorted SCR / Shunt Trip
  Starter Over-Temp Coast Down Lockout
  Starts per Hour Lockout Time between starts
  RTD Input (Option) Ground Fault (Option)
Enclosure NEMA 12 with 3R optional
  top and bottom entrance plates
  11 gauge steel
  ASA #61 gray powder coated paint
Communications RS485 with Modbus RTU protocol


To know more about Fairford Centris MV Softstarters please download the following product brochure:

FileDescriptionFile size
Download this file (Fairford_Centris_Brochure_v1_2012.pdf)DownloadFairford Centris MV Softstarter Brochure2241 kB

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