Control Concepts services all Hitachi drives and products. Contact us today!

  • AC Drives
  • Variable Frequency Drives (VFDs)
  • Programmable Logic Controllers (PLCs)

Hitachi is one of the leading suppliers of AC variable speed drives, PLC products, industrial automation systems and industrial control systems.

Hitachi AC Variable Frequency Drives, both low and medium voltage, are used in industrial manufacturing. They offer specific functionality in all applications and are designed to control different types of motors.

Hitachi VFDs are used in electro-mechanical drive systems to provide adjustable motor speed and torque control. They are used in a variety of applications in many industries, including:

  • Power
  • Oil & gas
  • Mining
  • Water
  • Plastic
  • Rubber

Hitachi PLCs are highly flexible and compatible with a variety of industrial automation and facility control systems.

Common Drive Failures

  • Software or programming problems
  • Non-functional cooling fans
  • Loose connections
  • Drive keeps blowing fuses or tripping breakers
  • Drive doesn’t run motor
  • Circuit board failure

Circuit board failure is the least common reason for drive failures. The most common fault that shuts down a drive is an over-current fault, of which there are 20-30 causes. We start with the dynamics of the motor and move on from there.

The Control Concepts Repair 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.

  • Keep the drive free of dust
  • Ensure proper ventilation to prevent overheating
  • Keep everything dry and protected from moisture

Call us for more information or to schedule service.