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MOTOR
CONTROL

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INTRODUCTION


RARA can design and build motor control resistors of any type for any application, including:  Wound-rotor AC motors with slip ring starters, DC motor starters, Field discharge resistors, Torque-increasing resistors for use with soft starters and other similar applications.

-custom designed for your particular system
-several stages of assembly depending on shipping needs

STARTING RESISTOR WITH CONTROLLER

 

GENERAL SPECIFICATIONS

Model No.

Motor 2ndary Voltage

Motor 2ndary Current

Control Step

Motor Power

SRI(SRO)-5N

2000V max.

200A max.

3 to 4 steps

<200kW

SRI(SRO)-6N

2500V max.

400A max.

5 steps

500kW

SRI(SRO)-7N

2500V max.

600A max.

6 steps

750kW

SRI(SRO)-9N

3500V max.

1000A max.

8 steps

1000kW

SRI(SRO)-11N

4000V max.

1500A max.

10 steps

3000kW

CALCULATIONS

Minimum Information Needed for Model Selection:

1. Motor Power ________(kW),  2ndary Voltage ________(V2),  2ndary current ________(I2)
2. Duty Rate ________(%ED)  or Starting Rate ________(Time/Hr)
3. Control Panel Supplied
4. Control step (Balanced ________step)
5. Installation Location, Environmental Conditions or Applied Load
6. Starting Torque ________(%)  or GD2 of Motor and Load
7.
Speed Control Range
8. Other Requirement

 R = (a-1 - 0.05) X E2 /3 X I2

 Where:

a=1 Notch Current/Full Load Current
E2=2ndary Voltage 
I2=2ndary Current
R=Resistance/Phas
e

Copyright 1999-2005, RARA Electronics Corporation
Tel:82-32-817-4325 Fax:82-32-817-4329

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