PowerFlex 40 Replacement & Migration Guide (Alliance / UniMac Washer-Extractors)

This guide is for technicians replacing a failed PowerFlex 40 on a commercial washer-extractor. Every fact below comes from Rockwell’s or Alliance’s own documents (listed at the end, with page numbers). Where we interpret, we say so. Last verified October 21, 2026.

Status: what Rockwell discontinued and what it lists as the successor

Each Rockwell product page reads: Lifecycle status: Discontinued · Discontinued Date: June 30, 2025 · Replacement Category: Engineering Replacement. The successor pages read Active. For the drives in Alliance’s washer-extractor table:

For the two flagged pairs, Rockwell’s migration guide says the continuous rated output currents do not match and to consider the application requirements before choosing a replacement. Frame letters don’t carry across families: a PowerFlex 40 frame B and a PowerFlex 525 frame B are different sizes.

How to read a PowerFlex 40 catalog number

• The letter after “22B-” is the voltage class. D = 480 V AC 3-phase, B = 240 V AC 3-phase.
• The next three characters are the output current, not horsepower. 010 = 10.5 A (5 HP at 480 V); 6P0 = 6.0 A (3 HP at 480 V); the 240 V 5 HP drive is 017 = 17.5 A.
• Positions 13–14 are “reserved for custom firmware” in Rockwell’s table. Alliance’s manual prints its drives with a two-character suffix (for example “22B-D010N104xx”). Neither document says what Alliance’s suffix means; linking the two is our inference.

Why the PowerFlex 525 is not an Alliance drop-in

These are facts from the documents; the conclusion in the last paragraph is ours.

• Custom firmware and parameters. Alliance’s drive manual says all PowerFlex drives in its equipment are custom-developed with unique features and parameters, and that Allen-Bradley’s parameter information will differ and may not be relevant. Alliance’s drives report firmware 70.xx, 80.xx or 90.xx (parameter d016); Rockwell’s PowerFlex 40 manual covers firmware 1.xx–7.xx. Example: parameter A164 is “Balance State” on Alliance’s drives and “Comm Write Mode” in Rockwell’s manual.
• The balance output. On Alliance’s PowerFlex 40, terminal 17 is labelled “Bal Output” and 09 “Bal Common”. Alliance says the drive analyses the wash-load distribution during certain drain steps and reports the severity of imbalance to the machine controller — and warns never to permanently jumper those terminals. Rockwell’s PowerFlex 525 and migration documents contain no balance-detection function, and on the 525 the opto common moves from terminal 09 to 19.
• No Alliance document lists a 25B. We searched Alliance’s drive manual, its troubleshooting manual and a current parts manual: none mentions the PowerFlex 525, the 520-series or a 25B catalog number.

Our reading: Rockwell’s “engineering replacement” means the closest drive in Rockwell’s current line — not that it can do Alliance’s job in an Alliance machine. A 525 conversion on a washer-extractor is an engineering project (firmware functions, balance signal, parameters, wiring, mounting), not a parts swap. Matching the 22B catalog number Alliance specifies is the low-risk route while unused units exist.

If you do migrate to a PowerFlex 525: what Rockwell’s guide says changes

From Rockwell’s PowerFlex 40 and 40P Drives to PowerFlex 525 Drives Migration Guide (PFLEX-AP011C) and the 520-series manuals:

• Parameters do not transfer automatically. Rockwell’s pre-migration best practice is to upload and save the drive’s parameters with Connected Components Workbench or DriveExecutive, or record them manually if you can’t connect. The guide’s cross-reference shows the numbers change — for example Accel Time P039 becomes 41, Decel Time P040 becomes 42, and Stop Mode P037 value 4 “Ramp” becomes 45 value 0 “Ramp CF”. We found no Rockwell document describing an automatic PowerFlex 40-to-525 parameter conversion; the 525’s USB file transfer moves 525 configuration files.
• Mounting. Every 525 is deeper than the PowerFlex 40 it replaces (frame B: 136 mm vs 172 mm), and hole spacing differs. Rockwell offers adapter plates (25-AP0-FB for PowerFlex 40 frame B ratings, 25-AP0-FC for frame C). For the 22B-D024 and 22B-B033 ratings Rockwell’s documents disagree on whether a plate (25-AP0-FD) is needed.
• Control wiring. The fault relay loses its normally-closed contact (no R3 on the 525); a second relay R5/R6 is added. Opto common moves from 09 to 19, the RS-485 shield from 19 to C1, and safety inputs S1/S2/S+ are added. Sink/source is a jumper (J5) on the 525 instead of a DIP switch.
• Power. The frame C P1/P2 DC-bus inductor terminals are gone, and Rockwell says fuse and breaker sizing may differ — verify them.
• Keypad. The 4-digit LED display becomes a 5-digit scrolling text display.

Verify voltage, horsepower and catalog number before you order

Read the full catalog number from the old drive’s nameplate, including any series letter, and check it against the machine’s supply voltage. Alliance’s manual also tells you to verify the nameplate catalog number against the purchase order on delivery. To go from an Alliance service part number to the catalog number, use Alliance’s Table 2 — reproduced in our Alliance / UniMac PowerFlex 40 cross-reference:

What to record from the old drive before you replace it

• Nameplate: catalog number and series, plus date code (MFD), serial number and firmware revision (FRN).
• Display parameters: d016 firmware version, d017 drive type, and the fault history d007, d008, d009.
• Parameters: upload them with Connected Components Workbench or DriveExecutive if you can, or record them by hand; photograph the drive’s programming decal, which Alliance’s troubleshooting manual points technicians to. Note A192 (parameter checksum) and A193 (change counter).
• Wiring: label every power, motor and control wire and its terminal, including the balance wiring on 17 and 09.
• DIP switches: Sink/Source and the 0–10 V / 0–20 mA switch. Alliance warns that either set wrong can make a working drive look failed.
• Motor nameplate data and the RFI filter part number fitted with the drive.
• Don’t use P041 Reset to Defaults on the old drive as a “backup” step: it erases the Alliance parameters and raises F048.

Not sure the drive is the problem? Work through the no-spin troubleshooting guide, then see the PowerFlex 40 fault codes on Alliance / UniMac washer-extractors first — several faults have external causes.

Replacement drives we supply (same 22B catalog numbers)

New, unused, open-box surplus PowerFlex 40 drives for the 380–480 V positions in Alliance’s table. Each page documents the cross-reference; we confirm the match against your old drive’s nameplate before you pay. Programming with Alliance’s parameters is still required.

• 22B-D6P0N104 — Alliance F8168602 (3 HP, 480 V)
• 22B-D010N104 — Alliance / UniMac F8169418 (5 HP, 480 V)
• 22B-D012N104 — Alliance F8168702 (7.5 HP, 480 V)
• 22B-D024N104 — Alliance F8168705 (15 HP, 480 V)

Another part number? Look it up or send us the nameplate.

What we could not verify

• Whether a standard PowerFlex 525 can perform Alliance’s balance detection — no Rockwell or Alliance document addresses it.
• Whether Alliance approves or supplies any 25B drive for these washer-extractors.
• What Alliance’s “xx” / “Axx” catalog suffix means.
• Whether an adapter plate is needed for the 22B-D024 and 22B-B033 ratings (Rockwell’s documents conflict).

Sources

• Rockwell Automation, PowerFlex 40 and 40P Drives to PowerFlex 525 Drives Migration Guide, PFLEX-AP011C-EN-P (September 2023): pre-migration best practices p.6; rating tables and mismatch note p.22; mounting plates pp.86–87; terminals pp.45–59; parameter cross-reference p.97 — PDF
• Rockwell Automation, PowerFlex 40 user manual 22B-UM001J-EN-E (September 2025): catalog number explanation p.10, dimensions p.110 — PDF
• Rockwell Automation, PowerFlex 520-series user manual 520-UM001O-EN-E (September 2025): catalog explanation p.14, USB transfer pp.67–68, adapter plates p.181, dimensions pp.187–188 — PDF; technical data 520-TD001I p.36
• Rockwell Automation product pages for each catalog number in the status table (lifecycle, discontinued date, replacement), fetched October 20, 2026, e.g. 22B-D010N104
• Alliance Laundry Systems, washer-extractor AC drive manual F232120R7 (April 2014): nameplate check p.5, Table 2 p.7, balance output p.10, DIP switches p.11, terminal block p.12, display and Alliance parameters pp.24–27 — PDF
• Alliance Laundry Systems troubleshooting manual F8123401R2 (March 2011): drive faults and programming decal, p.28 — PDF

Alliance, UniMac, PowerFlex and Allen-Bradley are trademarks of their respective owners. Thermal Harbor is an independent parts supplier, not affiliated with or authorized by Alliance Laundry Systems or Rockwell Automation. Work on drives only as a qualified technician, with power disconnected and capacitors discharged.