Non Nema
2010
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 NEW Elodrive BFP 44C2U Non Fail Safe Fast Running NEMA 4 Electric Valve Actuator $39.95 Time Remaining: 10h 58m |
 Square D Combination Starter Non Fusible Disconnect Nema 12 Enclosure $225.00 Time Remaining: 21d 23h 43m Buy It Now for only: $225.00 |
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 Square D Combination Starter Non Fusible Disconnect Nema 1 Enclosure $225.00 Time Remaining: 21d 23h 32m Buy It Now for only: $225.00 |
 Cutler Hammer A201K5CAC Non Reversing Contactor Motor Starter NEMA Size 5 NEW $2,000.00 Time Remaining: 25d 10h 52m Buy It Now for only: $2,000.00 |
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Non Nema
How to Maintain a frequency Inverter (AC drive)? (part 2)
Continued from the article: How to Maintain a frequency Inverter (AC drive)? (part 1).
Dust on any electronic devices may cause mal-function or even failure. Dust absorbs moisture, which also contributes to failure. Periodically spraying air through the heat sink fan is a good PM measure. Discharging compressed air into a drive is a feasible option in some environments. But unfortunately typical plant air contains oil and water. To use compressed air for cooling, you must use air which is oil-free and dry. Otherwise you will do more harm than good. That requires a specialized, dedicated, and expensive air supply. And you still run the risk of generating electrostatic charges (ESD).
A non-static generating spray or a reverse-operated electrostatic charges (ESD) vacuum will reduce static build-up. Common plastics are prime generators of static electricity. The material in ESD vacuum cases and fans is a special, non-static generating plastic. These vacuums, and cans of non-static generating compressed air, are available through companies that specialize in static control equipment.
Keep it Dry
In figure 2, you can see what happened to a control board of variable speed drive (frequency inverter) periodically subjected to a moist environment. Initially, this VFD (AC drive) was wall-mounted in a clean, dry area of a mechanical room and moisture was not a problem. However, as it is often the case, a well-meaning modification led to problems.
Figure 2: Corrosion on Board Traces Caused by Moisture
In this example, an area of the building required a dehumidifier close to the mechanical room. Since wall space was available above the variable frequency drive (VFD), this is where the dehumidifier went. Unfortunately, the AC drive (VFD, VSD) was a NEMA 1 enclosure style (side vents and no seal around the cover). The obvious result was water dripping from the dehumidifier into the drive. In six months, the AC drive (VFD, VSD) accumulated enough water to produce circuit board corrosion.
What about condensation? Some variable frequency drive manufacturers included a type of "condensation protection" on earlier product versions. When the mercury dipped below 32 degrees Fahrenheit, the software logic would not allow the drive to start. But the drives seldom offer this protection today. If you operate the drive all day every day, the normal radiant heat from the heat sink should prevent condensation. Unless the unit is in continuous operation, use a NEMA 12 enclosure and thermostatically controlled space heater if you locate it where condensation is likely. (to be continued)
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You will be interested in reading some articles on applications of variable frequency drives (VFDs, AC drives).
About the Author
experienced in foreign trade, selling consumer electronics, digital gadgets, electrical machines.
Now working for Shenzhen POWTRAN Technology Co., Ltd.(GreenDriv Tech Limited), which is a professional company, experienced in manufacturing and exporting first rate cost-effective variable frequency drives, frequency inverters, variable speed drives, vvvf drives, ASD, AFD, VSD, VFD, ac drives...
The products are widely used on AC motors for energy saving and better process control.
Lanac - Nema Te
