Open vs Closed VFDs

When selecting a variable frequency drive (VFD) for your belt grinder, it's essential to understand the difference between open VFDs and closed (NEMA-rated) VFDs. At Diktator Grinders, we prioritize your safety and performance, which is why we only offer fully enclosed VFD systems built for demanding grinding environments.

⚠️ The Risk with Open VFDs
Open-style VFDs are intended for use inside sealed industrial control panels—not as standalone devices. These units often feature vented sides and exposed terminals, making them highly susceptible to environmental hazards.

They frequently appear in grinder bundles from overseas sellers (especially on eBay) and are marketed misleadingly as ready-to-use. In reality, open VFDs:

Allow metal dust and grinding grit to enter, risking internal damage

Are vulnerable to moisture from quenching blades, creating shock hazards

Typically fail prematurely in abrasive, high-particulate environments

✅ Why Diktator Uses Closed VFDs
Diktator VFD systems are fully enclosed in NEMA-rated housings, offering:

Protection from airborne grit and dust

Safety around water or coolant exposure

Plug-and-play installation with proper heat dissipation and durability

When you choose a Diktator motor package, you're investing in safety, reliability, and longevity. Have questions about VFDs or upgrading your setup? Reach out anytime at support@diktatorgrinder.com—we're happy to help.