Cross-referencing a variable frequency drive between brands sounds like a lookup, and electrically it almost is: every drive resolves to the same envelope of phase, voltage class, motor power, output current, and duty. Get those to line up and you have found a candidate. The trouble is the parts that do not line up, and the parts a cross-reference cannot see at all.
This guide explains what the VFD Cross-Reference tool matches across ABB ACS, Allen-Bradley PowerFlex, Yaskawa, and Danfoss VLT, where the real traps are (voltage classes that look the same but are not, duty ratings that some brands split and others do not, and output currents that differ by brand for the same motor), and the hard limit on what any electrical cross-reference can promise. A matched drive is a starting point for sourcing. It is not a certified drop-in, and the difference is on you to close.
1. What a Cross-Reference Actually Matches
A drive cross-reference matches the electrical envelope, which is the set of figures every manufacturer publishes for every drive:
- Phase (single or three) and voltage class with its rated range, for example 380 to 480 V three-phase.
- Motor power the drive is rated to run, in kW and HP.
- Output current in amps, the real electrical limit.
- Duty, Normal (variable torque) or Heavy (constant torque).
The tool normalizes all four brands to that envelope and ranks candidates by motor power, then cross-checks output current. It reports the closest size and a couple of nearby options with the exact differences. What it deliberately does not do is reduce the comparison to a single yes/no, because the differences are the point: you are the one who knows whether a half-frame size up will fit the panel and whether the wiring can carry it.
2. What It Does Not Tell You (Read This Before You Order)
An electrical match is necessary but not sufficient. A cross-reference cannot see, and does not check, any of the following:
- Physical size and mounting: frame dimensions, depth, and mounting pattern differ between brands even at the same power.
- Terminal and wiring layout, and whether your existing field wiring and protective devices are sized and routed for the replacement.
- Whether it is safe to upsize the drive or the motor on the existing circuit. A bigger drive can mean bigger conductors, a different breaker, and a different overload setting.
- Control mode (V/Hz, sensorless vector, closed-loop), fieldbus and I/O, and whether the new drive talks to your PLC the same way.
- Functional safety (STO, SIL rating), firmware and parameters, EMC category, ambient and altitude derating, and agency approvals for your application.
The tool says this plainly on every result, and it is not boilerplate. A drive that matches the envelope and fails any of the above is the wrong drive. Confirm the fit and the wiring, and verify the final choice with the manufacturer and a qualified engineer.
3. Voltage Classes: The Look-Alike Trap
Each brand names its voltage classes differently, and two that look the same are not always interchangeable. The tool maps them to a common set and, critically, carries each drive's real rated range so a near-miss is flagged rather than hidden:
| Common class | ABB ACS | PowerFlex | Yaskawa | Danfoss VLT |
|---|---|---|---|---|
| 200 to 240 V | -2 code | A/B letter | 200V class | T2 (3ph), S2 (1ph) |
| 380 to 480 V | -4 code | C (400V), D (480V) | 400V class | T4, T5 (to 500V) |
| 500 to 690 V | -6 (575/600), -7 (to 690) | E (600V), F (690V) | 600V class | T6 (to 600), T7 (to 690) |
The biggest trap is inside the 380 to 480 V band. A drive rated across the whole band (380 to 480 V) covers both a 400 V and a 480 V supply. But a drive rated 380 to 415 V only, common on European 400 V units, does not cover a 480 V supply. The tool flags exactly that: if your supply falls outside a candidate's rated range it warns you, and it always ranks a drive that truly covers your voltage above one that only comes close. The same care applies at the top: a 525 to 600 V drive is not a 690 V drive.
4. Normal Duty vs Heavy Duty: Not Every Brand Splits It
Drives carry two overload ratings. Normal Duty (variable torque, around 110 to 120 percent overload) suits fans and centrifugal pumps. Heavy Duty (constant torque, around 150 percent overload) suits conveyors, crushers, and positive-displacement pumps, and on the same drive it corresponds to a smaller motor. The catch for cross-referencing is that the brands do not publish duty the same way:
| Brand | What the data carries |
|---|---|
| ABB ACS | Separate Normal-Duty and Heavy-Duty current and motor power |
| Yaskawa | Separate Normal-Duty and Heavy-Duty current |
| PowerFlex | Normal-Duty (continuous) rating |
| Danfoss VLT | One continuous-duty current (the second column some tables show is an intermittent overload peak, not a continuous rating) |
So when you cross-reference a Heavy-Duty load, ABB and Yaskawa candidates are matched on their published Heavy-Duty current. PowerFlex and Danfoss are matched on their continuous rating, and the tool flags that the real Heavy-Duty drive in those brands is usually a frame or two smaller than the continuous figure shown. Size a constant-torque job on Heavy Duty, and for PowerFlex and Danfoss confirm the Heavy-Duty size in the catalog before ordering.
5. Output Current Is the Hard Limit, but the Numbers Differ by Brand
Motor power is how a drive is sized and how techs think, so the tool leads on it. But the real electrical limit is output current: the drive has to deliver the amps the motor draws. Two facts make this subtle in a cross-reference:
- Brands rate the same motor at different output amps. A 4 kW drive might be published at 10.5 A by one brand and 8.8 A by another, purely from rating convention. A 10 to 15 percent difference between equivalent drives is normal, so the tool treats current as a cross-check with a tolerance, not a reason to jump a size.
- A drive's rated output is not your motor's draw. The figure that matters is your motor full-load amps. Enter it in parameter mode (the Motor FLA Lookup gives standard values) and the tool checks every candidate against it, flagging any whose output falls short so you can confirm before sizing down.
If you only have the source drive's rating and not the motor FLA, read the amp differences as information, not a verdict. A candidate listed a little lower on amps than your old drive is usually fine for the same motor; a candidate listed well below it is worth a hard look.
6. Family Tiers: Matching Like for Like
Each brand sells a general-purpose line and a higher-performance line, and a sensible cross-reference keeps you in the same tier where it can. The tool tags every family and prefers a same-tier match, while still showing the best electrical fit first:
| Tier | ABB | PowerFlex | Yaskawa | Danfoss |
|---|---|---|---|---|
| General purpose | ACS180, ACS380, ACS480, ACS580 | 523, 525 | GA500, GA800 | FC 51, FC 102, FC 202, FC 301 |
| High performance / heavy | ACS880 | 753, 755 | A1000 (legacy) | FC 302 |
So a PowerFlex 525 (general purpose) lines up most naturally with an ABB ACS580, a Yaskawa GA800, and a Danfoss FC 301; a PowerFlex 755 (high performance) lines up with an ABB ACS880 and a Danfoss FC 302. Tiering is a guide, not a rule: the tool ranks on electrical fit first and shows the cross-tier option as an alternate, and it marks legacy lines (such as the Yaskawa A1000 and V1000, and the ABB ACS355) so you can choose a current product when one fits equally well.
7. Using the Result Without Getting Burned
A good way to work through a cross-reference:
- Match the envelope. Enter the source by code or parameters, set the duty, and read the closest size per brand.
- Check the current against the motor, not the old drive. Enter the motor full-load amps so the cross-check is against the load, and clear any current-shortfall flags.
- Confirm the voltage range covers your supply. Clear any voltage flag, especially in the 400 versus 480 V band.
- Confirm the duty. For constant-torque loads use Heavy Duty, and for PowerFlex and Danfoss verify the Heavy-Duty size in the catalog.
- Close the gap the tool cannot see. Check the physical fit and mounting, the wiring and protection, control and fieldbus, safety, firmware, EMC, derating, and approvals, then verify with the manufacturer and a qualified engineer before you order or install.
Done that way, the cross-reference saves you the catalog cross-walk and leaves the judgment where it belongs, with the person who knows the installation.