Every VFD purchase comes down to one question—do I need this specific model or can I get away with something cheaper?
That's the question I've asked myself on every major motor control investment over the past 8 years. As a procurement manager at a mid-size chemical plant, I've managed our automation budget ($80,000+/year), negotiated with 30+ vendors, and documented every order in our cost tracking system. I've bought ABB ACS355 units for conveyor lines, ACS880 drives for pumps, and even a few ACH580 units for HVAC retrofit projects.
But here's the thing: there isn't a universal answer. Whether an ABB VFD—or any specific brand—is 'worth it' depends entirely on your situation. So instead of giving you a single recommendation, I'll walk you through the three scenarios I've encountered most often, and how I made the call each time.
Scenario 1: Routine installation with standard conditions
This is the easy one. You're replacing a failed drive on a standard motor. No unusual ambient temperature, no aggressive chemicals, no tight space constraints. The motor is 10 HP or less, and you have access to basic electrical tools: a multimeter to check AC voltage, maybe a surge protector for the panel feeding the drive.
In this case, I lean toward a new, current-model ABB VFD. Why? Because the total cost of ownership (TCO) calculation favors new equipment. Here's what I mean:
- A new ABB ACS355 (say, a 5 HP unit) runs roughly $400–$600 depending on your distributor. That includes a standard warranty (typically 12 months) and full technical support.
- Add $50–$80 for a proper surge protector for the panel. Cheap ones at $20 look tempting—they're not. I've replaced three of those after lightning took them out in a single storm.
- Add $50–$100 for basic accessories like a remote keypad if you need one.
Total: $500–$780. That's the baseline cost for a reliable, warrantied setup with known performance specs.
Now, what if you find a used ABB VFD on eBay for $200? I've gone down that road twice. The first time, the drive arrived with a dead power supply—cost $150 to repair. The second time, the control board was corroded and unresponsive. That unit is now a paperweight.
You could argue the used drive was 'cheaper' at $200, but my actual cost was $350 (purchase + repair) for the first one, and $200 plus three weeks of downtime for the second. The new drive was actually cheaper in TCO.
Scenario 2: Harsh environment or critical application
This is where the decision gets harder. Your drive is in a dusty production area, exposed to elevated temperatures (over 40°C), or powering a critical pump that stops the whole line when it fails.
Here, I almost always buy new, specific models designed for the environment. For example:
- ABB ACS880 drives are built for demanding applications—they have better thermal management, more robust I/O, and support direct torque control. In a harsh environment, the extra cost (typically 20–30% over an ACS355) pays for itself in reduced downtime.
- I also budget for a quality multimeter with AC voltage capability—Fluke 117 or similar, ~$200—to verify power quality before and after installation. A cheap $30 multimeter can't reliably measure the harmonics that damage drives.
I've also learned to include the cost of proper training. When we installed our first ACS880 on a critical pump, I sent two technicians to ABB's training in Cleveland. That course cost $1,200 per person plus travel—about $4,000 total. But the following year, we saved $8,500 in service calls because our own team could diagnose basic faults and even replace an air filter without calling support.
Looking back, I should have done the training sooner. At the time, I thought we could just call the distributor's support line for free. And we could—for basic stuff. But when the control board showed a cryptic error code at 2 AM on a Saturday, a phone call didn't fix it. The technician who'd been to training solved it remotely in 15 minutes.
Scenario 3: Legacy system with existing ABB VFDs
This is the trickiest scenario. You have an older ABB drive (maybe an ACS 600 or early ACS800) that's still running a critical process. The drive is working fine, but it's 10+ years old. Should you proactively replace it?
My rule of thumb: if you have a stock of spare parts (boards, fans, keypads) for that model, keep it running until those spares are exhausted. Then upgrade to a current model.
I get why some people want to upgrade immediately—newer drives are more efficient, have better diagnostics, and are easier to support. But the TCO rarely justifies it unless:
- Your energy costs are high enough that a 2–3% efficiency gain pays back within 3 years.
- You're experiencing frequent failures due to obsolete components.
- Your insurer or regulatory body requires current models.
For example, we had an ACS800 running a 50 HP pump for 11 years. The drive worked fine. We had three spare I/O boards and a spare power supply on the shelf. Replacing it would have cost ~$3,000 for the new ACS880 plus $500 for installation and commissioning. With our annual energy cost of ~$2,500 for that pump, the efficiency improvement would save maybe $75–$100 per year. Payback: 30 years. Not worth it.
To be fair, if you're upgrading because you need features the old drive doesn't have (like Ethernet/IP or integrated safety), then the legacy drive has to go. But if it's just about age? Let it ride until the spares run dry.
How to decide which scenario you're in
Here's a quick decision guide I use:
- Is the motor under 20 HP, in a clean environment, and non-critical? → Buy a new current-model drive (Scenario 1).
- Is the motor critical to production, in a harsh environment, or over 50 HP? → Buy a new premium-model drive with training (Scenario 2).
- Do you have an existing drive that's over 8 years old but still working? → Keep it until spares are gone (Scenario 3), unless you need new features.
Honestly, I'm not sure why some people always default to 'buy the cheapest' or 'always upgrade'—both extremes cost more in the long run. The right answer depends on your specific numbers, your team's skills, and your risk tolerance. But if you follow this framework, you'll save money without sacrificing reliability.
