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GUIDELINES FOR TROUBLE-FREE MAINTENANCE OF AC DRIVES

Suggested techniques for trouble-free AC-drive operation

   

The environment in which an AC drive will be put is completely unpredictable. The hardest installations sometimes take place in industrial settings.

 

In order to work from a local control panel, fieldbus, or discrete input/output (I/O), drives must be designed from the bottom up with a variety of uses in mind, as well as the ability to deal with a variety of climates, power sources, motor types, and distances. A combination of greater maintenance expenses, higher service costs, a decline in operational reliability, or, worst of all, more downtime might occur as a result of not taking the environment into consideration from the start.

 

This post offers extra best practices for trouble-free operation of your drive and application in the area in which it is installed, presuming the drive is sized for suitable control with respect to the motor and application (voltage, power, response time, and I/O requirements).

 

Think about the following

  • Mechanical: Is an enclosure required for the drive’s installation environment?
  • What is the power supply, and how reliable is it?
  • wiring for the motor that powers it.
  • I/O: wires that were run and placed to control the application.
  • Fieldbus wiring for impartial monitoring and control

 

The ideal position would be for an engineer to create the programme from the ground up while taking into account all necessary components, this is usually not the case. Every day, repairs, refits, and new installations are made to existing facilities. The following assists in giving the best chance for trouble-free operation.The consumer electronic and repair industry consists of companies engaged in providing repair and maintenance to electronics. Automat is one of the largest  Electronics company in Dubai & contact us to know more.

Spacing

 

The AFD can be suitably iced since there is room around it for air to flow. The manufacturer provides ideas for the area above, below, and on the sides. Drives can often be installed side by side with no space around them.

 

The electrical and mechanical pieces of the AFD can be damaged by aggressive gasses like hydrogen sulfide, chlorine, or ammonia. Polychlorinated biphenyl tracks and door seals may slowly deteriorate as a result of contaminated cooling air. Corroded copper is a blatant sign of an aggressive environment. Enclosures and circuit boards with conformal coatings are suggested in hostile conditions.

 

Power wiring Power input

 

The power supply (230, 460, or 600 volts) should be known before choosing an AC drive. Only single-phase power is accessible in some distant regions, requiring a unique design. This data is accessible in new designs.

 

Important areas to look into are:

 

-Variable voltage: choose a single-phase or three-phase drive suitable for that voltage;

-Transformer design: Does the transformer have a secondary that is firmly grounded? If not, there can be metal oxide varistors or filter caps on the drive that need to be taken off;

-Exists any problems with power? It might require the use of an isolation transformer, an external reactor, or a drive with an inbuilt direct-current choke or row reactor.

 

Grounding & shields of motor wiring

 

It’s important to check the cabling between the drive and the motor. When replacing a starter or contactor with a drive during a refit, keep in mind that the motor wiring may have previously consisted of separate conductors in a conduit. Insulated-gate bipolar transistors are used in AC drives to regulate a motor and adjust speed. The wire needs to be designed and sized appropriately for the installation location. You need the proper drive and motor combination in addition to the cable. If a certain route is required, take into account if the environment contains moisture, oil, or the risk of the cable getting crushed when choosing the suitable cable.

 

To minimize peak voltages from occurring at the motor terminals as a result of reflected waves, an input reactor and a dU/dT filtering are advised when installing a drive on an old motor.

 

Strong voltage

 

Even with the equipment switched off and locked out, induced voltage from output motor wires running together can charge equipment capacitors. Failure to employ insulated cables, metal conduits, or separate output motor cables could result in fatalities or severe injuries. Be sure to:

 

Run output motor cables separately, use shielded cables, or place them in metal conduits. Adhere to local and federal electrical code standards for cable size.

 

Statutory wiring

 

Integrity in control wiring is crucial. Shielded cables are necessary for the control wire for digital and analogue signals, fieldbus cables, safety circuits, and feedback devices, which must be isolated from the wiring for power and motors. When power or the motor must cross control wiring, do so at a 90-degree angle.

 

Select wiring that is rated for the voltage, current, and signal being transported. Use the shield to ward off crosstalk.

 

Many times, the cord from a mounted, remote control panel is disregarded. The cable needs to be run away from the wiring for the motor and the power source

 

Best practices

 

The best installation guidance and the highest chance for problem-free operation are given by manufacturer recommendations and manual instructions. Use the following checklist to go over each installation area if there is a variance. Due to cost, installation method, or other factors, some areas may not qualify or can be changed. Checkout for AC drive repair services. 

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