How to Size and Configure a Yaskawa VFD: GA700, A1000 Series

Sizing a Yaskawa VFD correctly comes down to one thing: matching the drive’s rated output current to the motor’s full load amps, then adjusting for altitude, duty cycle, and enclosure conditions. Get that wrong and the result is nuisance tripping, premature failure, or a drive that costs far more than the application needs. This guide breaks down how the GA700 and A1000 series differ, how to size them properly, and where most sizing mistakes actually happen.

Demand for this kind of technical clarity isn’t shrinking. According to 2025 Market Growth Reports data, North America recorded over 580,000 VFD installations in 2024, with the United States representing roughly 430,000 units, and pumps and fan applications collectively accounted for over 52% of total VFD usage globally – exactly the territory where Yaskawa’s GA700 and A1000 platforms live.

GA700 vs A1000: What’s the Real Difference?

The GA700 is Yaskawa’s current general-purpose vector drive; the A1000 is the previous generation, still widely installed and still fully supported. Both cover a similarly broad horsepower range, both use the same lettered parameter group structure, and both show up constantly in industrial facilities across water treatment, HVAC, and manufacturing.

Why the A1000 Still Matters

Plenty of engineers assume an older drive series means outdated technology. That’s not really the case here – the A1000 remains a capable, high-performance vector drive, and thousands of units are still running motors reliably in the field.

Replacing a failed A1000 with another A1000 often makes more sense than forcing a full upgrade, especially when existing wiring, programming, and spare parts inventory are already built around that platform.

What Changed with the GA700

The GA700 added a few genuinely useful upgrades rather than just a redesign for its own sake:

• Built-in iQ-Pump and iQ-Pump Advanced modes for pressure- or flow-based PID control, removing the need for a separate controller in many pump applications
• DriveWorks EZ, a lightweight onboard programming tool for basic interlocks and sequencing
• Standard Modbus RTU communication, with EtherNet/IP, PROFINET, and DeviceNet available through option cards
• IP20 and IP55 enclosure choices, both with a built-in EMC filter

How Do You Size a Yaskawa VFD Correctly?

The short answer: match the drive’s output current rating to the motor’s nameplate FLA (full load amps), not just its horsepower. Horsepower is a rough guide, but two motors rated at the same HP can carry different FLA values depending on efficiency class and design – checking the actual nameplate current avoids expensive guesswork.

Altitude Derating – A Commonly Missed Step

Above roughly 3,300 feet (about 1,000 meters), a Yaskawa VFD needs to be derated because thinner air reduces its ability to cool itself. This matters more than most buyers expect, particularly across the Mountain West region of the US – Denver, Salt Lake City, Albuquerque, and similar elevations all fall into derating territory.

Note: Skipping this calculation doesn’t always cause an immediate failure. More often it shortens drive life gradually or triggers overtemperature faults that seem unrelated to altitude at first glance.

Normal Duty vs Heavy Duty Ratings

Most Yaskawa drives offer two current ratings on the same hardware:

Choosing ND for a load that actually behaves like HD can leave a motor underprotected during startup surges. Choosing HD for a simple pump application, on the other hand, often just means paying for capacity that never gets used.

Reading a Yaskawa Model Number

Model numbers look complicated until they’re broken into segments. Take CIMR-AU2A0006FAA as an example:

• CIMR – identifies it as a Yaskawa drive
• A – indicates the A1000 series
• U2A – 200V class, three-phase
• 0006 – 6A rated output current
• FAA – standard enclosure configuration

This structure matters most during replacement projects, when matching the exact current rating against a nameplate is more reliable than matching horsepower alone.

Key Parameters Worth Knowing

A handful of settings come up again and again during commissioning and troubleshooting:

• C6-01 sets the carrier frequency. Lowering it can reduce audible motor noise and cut nuisance overtemperature trips on long cable runs, though it may increase motor noise at the low end.
• L3-04 controls stall prevention during acceleration – a setting that frequently needs adjustment on loads with high starting torque, like heavily loaded conveyors.
• L8-02 handles ambient temperature derating, tying directly back into altitude and enclosure conditions covered above.

Parameter Groups at a Glance

Both the GA700 and A1000 organize settings into the same lettered groups:

• A – initialization (language, access level)
• b – application functions (PID setup, pump-specific control)
• C – tuning (acceleration/deceleration, carrier frequency)
• d – frequency references and preset speeds
• E – motor constants and nameplate data

Because this structure carries over between generations, many A1000 parameters map directly to GA700 equivalents. Migration is smoother than switching between unrelated drive brands – though specific parameter numbers and default values can differ, so a side-by-side check during commissioning is still worth doing rather than assuming a straight swap.

What Do the Common Fault Codes Mean?

When a Yaskawa VFD trips, the fault code usually points straight at the cause:

• oC – overcurrent, often from a mechanical bind or an overly aggressive acceleration ramp
• oV – overvoltage, frequently tied to fast deceleration without enough braking capacity
• UV1 – undervoltage, commonly caused by a sagging supply or a loose power connection
• OL1 – motor overload, which can mean the drive is correctly protecting an undersized motor, or that overload parameters were never set to match actual nameplate current

Catching these early during commissioning, rather than chasing them after installation, saves both downtime and diagnostic time later.

Why Reliable Sourcing Matters for These Drives

Energy savings from VFD adoption range between 15% and 35% per motor, which is exactly why so many facilities standardize on VFD-driven pumps and fans rather than fixed-speed motors. But those savings only materialize if the drive is sized correctly and sourced from stock that matches the actual model number needed – not a close approximation.

Facilities running mixed A1000/GA700 installed bases face a common problem: sourcing an exact replacement quickly, without waiting weeks for a special order. That’s a sourcing challenge, not just a technical one.

Whether the need is a direct replacement A1000 to keep an existing pump station running, or a GA700 to add built-in PID control to a modernization project, having the correct model number confirmed before ordering avoids costly mismatches. Zancot stocks Yaskawa A1000 drives for industrial buyers who need parts sourced accurately and on schedule.

Frequently Asked Questions

What’s the main difference between the GA700 and A1000?

The GA700 is Yaskawa’s current-generation drive with added features like iQ-Pump PID control and DriveWorks EZ onboard logic. The A1000 is the previous generation but remains widely used and fully supported, particularly for replacement projects.

Can an A1000 be replaced with a GA700 without reprogramming everything?

Not entirely from scratch. Many parameters map directly between the two series since both use the same lettered group structure, but specific parameter numbers and defaults can differ, so commissioning still requires a comparison rather than a blind copy.

How is altitude derating calculated for a Yaskawa VFD?

Derating typically begins above roughly 3,300 feet (1,000 meters). The exact derating percentage depends on the specific model and enclosure – Yaskawa’s technical documentation includes derating tables by model series.

What does the fault code OL1 usually mean?

OL1 indicates motor overload. It can mean the drive is correctly protecting an undersized motor, or that motor overload parameters weren’t set to match the actual nameplate current during commissioning.

Where can these drives be sourced quickly?

GA700 and A1000 drives are available through Zancot for buyers who need the exact model number matched to their application, without long special-order lead times.