Control Concepts services all Emerson drives.

  • AC variable frequency drives (VFDs)
  • DC secondary resistive controller drives (SRCs)

As of September 30, 2017, Nidec completed acquisition of Emerson Electric Co.’s motors, drives and electric power generation businesses.

What Can Emerson CT Drives Do?


Emerson AC Variable Frequency Drives provide a wide range of power and voltage settings paired with high performance motor control. An Emerson VFD is easy to use and extendable through a broad range of click-in option models.

The compact size of an Emerson VFD contains integrated programmable automation and motion control.

You can find them in:

  • Process applications

  • Industrial applications

  • Elevator applications

Emerson DC Secondary Resistive Drives are commonly found in the metals, mining, and printing industries. They also play a role in crane control. Many service companies prefer to replace a DC system with a new AC drive and motor to reduce maintenance. However, this takes the drive out of service for a significant amount of time.

Control Concepts can use existing DC motors and upgraded DC drives to replace a failed DC system if it cannot be repaired.

Today there are DC drives that are based on AC technology and can deliver: 

  • Enhanced motor performance

  • Reliability

  • System integration options

The Repair Process

Control Concepts has over 30 years of experience in Emerson Control Techniques drive repair, service, and support. 

Common Drive Failures

  • Drive doesn’t run the motor

  • Drive keeps blowing fuses or tripping breakers

  • Loose connections

  • Non-functional cooling fans

  • Software or programming problems

  • Circuit board failure

Our Process

We check the motor drive and terminals for substandard connections which can be caused by anything from heat cycles and mechanical vibration to reusing or over-tightening torque screws.

We conduct diode and IGBT tests on the input/output power sections before applying power to the drive unit. This is to protect against further damage from a short. 

We power up the unit and perform amp readings and output frequency tests, slowly increasing the voltage until the rated input voltage of the drive is reached. 

If everything functions properly, we use the drive to run a motor through basic jog functions after backing up existing programs. If the motor does not run, we check the output voltages and current ratings going to the motor to check drive function for motor rotation.

Most drive failures can be avoided through preventative maintenance.

Control Concepts provides 24/7 Emerson service and support. Call us for more information or to schedule service.