ソース : mepcaエンジニアリング

VACON英国 – 可変速度ドライブを使用 (のVSD) エネルギーを節約する素晴らしい方法ですが、, あなたのVSDを超える5歳であれば, それはそれらをもう一度見て取る時が来た, スティーブン·タハール氏は述べています, AC可変速ドライブの専門家のマネージングディレクター, VACON英国.

過去10年間のために, 技術的な押して、フィッティングのVSDによって作ることができるエネルギーの節約についての物語であふれていた. 物語は真である, 多くの企業が既にのVSDがインストールされている理由である. これらの会社のエンジニアは、VSD省エネストーリーが表示されたら, 彼らはおそらく、彼らはそこにあって、それをやったと思う, しかし、彼らは戻って座って、良い仕事の輝きを楽しんで正当化される? それは彼らのVSDの年齢に依存. 彼らは数年前なら, それはさらなる行動が必要であることはまずありません. しかしのVSDは5歳以上であれば, それは別の話だ.

That’s because the intrinsic efficiency of VSDs has improved considerably in recent years. It’s not, しかしながら, as simple as saying that VSD efficiency has improved by one or two per cent over the full operating range, because the efficiency improvements relate mostly to operation at reduced loads and speeds.

The efficiency of older drives running at less than 50% load can be surprisingly low – many small drives over five years old struggle to reach 60% efficiency at 40% ロード. The larger drives of the era fare somewhat better, but even with them, 80% efficiency at 40% load would have been considered satisfactory. In contrast, the latest ac VSDs deliver at least 90% efficiency down to 20% of full load.

But does this extra efficiency matter? After all, the gains are biggest when the drives are lightly loaded, and how often does that happen? In many applications, the answer is that the drives run lightly loaded most of the time.

Designers size motors for worst-case conditions – with an air-conditioning installation, 例えば, this would be the hottest day of the year. Then they further increase the motor size “to be on the safe side”. This means most fan and pump motors rarely need to deliver full output. Instead, they spend their lives running lightly loaded, which is the least efficient area of operation for older VSDs. This is a very good reason to review the efficiency of older VSDs and, if necessary, replace them with modern products.

And it’s not only efficiency that will be improved by installing new drives. The latest units are much more reliable and, in today’s de-skilled world, this is a very real advantage. 加えて, modern VSDs have superior harmonic and EMC performance, making it easier for users to satisfy the demands of the supply authorities.

There’s no doubt that, in appropriate applications, VSDs deliver big energy savings but older VSDs aren’t a “fit-and-forget” solution. They probably did a great job in their day, but it’s likely that they are now markedly inferior to the latest products. 要するに, if your VSDs have passed their fifth birthday, it’s time to talk to an expert like Vacon about reviewing their performance. You may be pleasantly surprised at the savings you could make!

ソース : mepcaエンジニアリング