Basler Electric SMC-250 Synchronous Motor Controller

Overview

The SMC-250 Synchronous Motor Controller is a prepackaged control

and protection solution for brushless, synchronous motor applications.

It features the DECS-250 Digital Excitation Control System and a Basler

Electric protection device for motor pullout protection. Both are integrated

into a compact package that is preconfigured, prewired, and tested for

easy installation in a new or existing enclosure, saving installation and

commissioning time.

Features

• 20-ampere, pulse-width-modulated (PWM), insulated-gate bipolar

transistor (IGBT) power stage

• Single DECS-250 or dual, redundant DECS-250 option

• Control modes: var/power factor, field current regulation, and field

voltage regulation

• Available protection:

-Power factor/loss of synchronization (55)

-Over/Under Field Current (40)*

-Fuse loss detection protects against false trip due to loss of voltage

sensing (60FL)*

-Up to 24 resistive temperature detectors (49RTD) inputs provide

thermal protection with an optional remote RTD module*

-Up to 100 starts per time interval protection (66)*

-Undervoltage (27)

-Overvoltage (59)

-Instantaneous undercurrent (37)*

-Instantaneous overcurrent (50)*

• Communication provisions:

-USB

-Modbus® RS-485 RTU

-Ethernet 100Base-T (Modbus TCP)

• Monitoring:

-Real-time monitoring

-Data logging

-Sequence of events recorder

• Programmable logic for DECS-250 and BE1-11m option

Benefits

• The DECS-250 and a motor protection device working together

results in more efficient control of the machine to help avoid

machine downtime

• Maintains constant power factor or vars for varying motor loads

• Improves the plant power factor which could eliminate lower

power factor penalties

• Eliminates synchronous motor pullout issues due to insufficient

excitation

• Excitation field forcing maintains power factor or var control on

the motor during momentary voltage dips of the station power

source

• Prevents rotor overheating and motor pullout with field

overcurrent and underexcitation limiters

• Improves the life expectancy of brushless exciter diodes by

preventing motor pullout

• Brushless exciter diode monitor detects open/shorted diodes that

can cause motor vibration

• Real-time monitoring and event recording capture occurrences

within the system for live data analysis

• Loss of voltage sensing detection enables a transfer to manual

mode to maintain motor operation

• Both the DECS-250 and the BE1-11m option are programmed

using BESTCOMSPlus® software. Utilizing the same program

for both devices provides easy logic setup and communication

between the DECS-250 and the BE1-11m.

• Dual DECS-250 controller option ensures continued operation in

the event of a failure

• Prewired for easy installation into new or existing enclosures

• Current transformer (CT) shorting provision for added safety