Non Nema
2010
 |
 New Allen Bradley 509COD Nema Full Voltage Non Reversing Starter $100.00 Time Remaining: 26d 18h 53m Buy It Now for only: $100.00 |
 6 Square D Motor Starter Non Rev NEMA Sz00 120VAC With Electrical Interlock $370.00 Time Remaining: 1d 13h 37m Buy It Now for only: $450.00 |
 Square D 3 Pole NEMA Size 1 Non Reversing Contactor 8502SCO2V02 120V $29.99 Time Remaining: 11d 16h 56m Buy It Now for only: $29.99 |
 Allen Bradley 1362 NCG NEMA TYPE 4 13 NON REVERSING CONTROLLER 230V AC 2HP NEW $219.00 Time Remaining: 2d 20h 5m Buy It Now for only: $219.00 |
 SQUARE D 8536SBO2V02S MOTOR STARTER NON REV NEMA Sz0 120VAC $169.97 Time Remaining: 4d 17h 38m Buy It Now for only: $169.97 |
 NEW Square D 3 Pole NEMA Size 2 Non Reversing Contactor 8502SDO2V02 120V $149.99 Time Remaining: 11d 16h 55m Buy It Now for only: $149.99 |
 Allen Bradley 1362 NCG NEMA TYPE 4 13 NON REVERSING CONTROLLER 230V AC 2HP $199.00 Time Remaining: 2d 20h 11m Buy It Now for only: $199.00 |
 Westinghouse Non Reversing NEMA Size 4 Starter OLR A200M4CACD 100HP $149.99 Time Remaining: 7d 16h 38m Buy It Now for only: $149.99 |
 Allen Bradley 1362 NCF NEMA TYPE 4 13 NON REVERSING CONTROLLER 115V AC 1 8 1HP $192.50 Time Remaining: 2d 16h 1m Buy It Now for only: $192.50 |
 Cutler Hammer Size 3 Non Reversing AN16KNO Nema 3R $650.00 Time Remaining: 19d 11h 3m Buy It Now for only: $650.00 |
 Leviton Non Nema 10A 15A 250V 125V Locking Connector $16.00 Time Remaining: 9d 10h 21m Buy It Now for only: $16.00 |
 Joslyn Clark Non Reversing Magnetic Starter Nema 0 3 Nema 4 for Motor Control $385.00 Time Remaining: 18d 9h 8m Buy It Now for only: $385.00 |
 Cutler Hammer A201K5CAC Non Reversing Contactor Motor Starter NEMA Size 5 NEW $2,300.00 Time Remaining: 9d 17h 31m Buy It Now for only: $2,300.00 |
 WOODHEAD 3762N Marine Grade Connector Non Nema 50A 250 DC 600AC NIB $38.00 Time Remaining: 16d 16h 57m Buy It Now for only: $38.00 |
 ALLEN BRADLEY 509 ECD NEMA Full Voltage Non Reversing StarterSIZE 4115 120V 60 $3,557.00 Time Remaining: 20d 10h 37m Buy It Now for only: $3,557.00 |
 Allen Bradley NEMA Full Voltage Non Rev Starter Size 1 $81.56 Time Remaining: 24d 18h 52m Buy It Now for only: $81.56 |
 NEW SIEMENS 3TB4210 0AA8 NON REVERSING CONTACTOR NEMA 0 $14.99 Time Remaining: 8d 11h 58m Buy It Now for only: $14.99 |
 Westinghouse Non Reversing Contactor A201K3CA NEMA 3 Model J NOS $1,400.00 Time Remaining: 20d 9h 28m Buy It Now for only: $1,400.00 |
 Cutler Hammer W200M4CFC Nema Size 4 135AMP 120V Non Reversing Motor Starter $1,700.00 Time Remaining: 2d 21h 53m Buy It Now for only: $1,700.00 |
 CUTLER HAMMER W200M5CFC SIZE 5 WESTINGHOUSE NEMA NON COMBO STARTER $5,500.00 Time Remaining: 14d 22h 59m Buy It Now for only: $5,500.00 |
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)
-----------------------
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
