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Key Technical Specifications
- Model: B/M-60031-2
- Common Search Format: BM-60031-2
- Brand Lineage: ASEA Brown Boveri / ABB
- Product Description: Resolver Driver Module
- Primary Function: Motor resolver excitation and feedback-signal interface
- Application Class: Legacy industrial motion-control and drive systems
- Feedback Device: Resolver
- System Role: Converts resolver position feedback for use by the associated drive/control system
- Module Type: I/O / feedback interface module
- Replacement Requirement: Match the exact B/M-60031-2 part number, installed drive system, connector arrangement, and resolver wiring
- Condition Commonly Offered: Refurbished, tested surplus
- Warranty Commonly Offered: 12 months by independent repair/supply channels
- Lifecycle Status: Obsolete legacy hardware; stock depends on recovered inventory and repairable cores
The B/M-60031-2 is listed as an ABB resolver driver I/O module. Publicly available listings do not provide an OEM electrical datasheet, connector pinout, resolver excitation voltage, or supported drive-family document; verify these details from the installed equipment documentation before purchase or installation.
Product Introduction
The ASEA Brown Boveri B/M-60031-2 is a legacy ABB resolver driver module used in industrial motion-control systems. Its job is to interface with a resolver feedback device on a motor or machine axis, allowing the associated controller or drive to determine rotor position and speed.
This module is usually purchased as an exact spare for installed legacy ABB equipment rather than as a general replacement part. Resolver feedback is not interchangeable by appearance. Confirm the exact module label, connected drive model, resolver cable connector, excitation wiring, and feedback configuration before ordering. ABB was formed from the 1988 merger of Asea AB and BBC Brown Boveri Ltd.
B/M-60031-2
B/M-60031-2
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Drive immediately faults with resolver or feedback error | Open resolver cable, damaged connector, incorrect module, failed resolver, or failed driver module | ✅ High | Inspect resolver connector pins, cable shield, and strain relief; review the drive diagnostic history | Check cable and motor feedback device before replacing B/M-60031-2 |
| Axis will not enable | Active safety circuit, DC bus fault, motor power fault, feedback fault, controller inhibit, or resolver-driver issue | ✅ Possible | Read the exact drive fault code and verify safety chain, control supply, and motor power independently | Do not replace the resolver module until the exact fault identifies a feedback-related issue |
| Axis moves erratically or hunts at standstill | Feedback phase error, resolver wiring fault, incorrect resolver ratio, mechanical coupling issue, or failed interface | ✅ High | Compare resolver wiring terminal-by-terminal with drawings; inspect coupling and gearbox for backlash | Stop the machine and correct feedback wiring before attempting tuning changes |
| Motor rotates in the wrong direction after replacement | Resolver sine/cosine leads swapped, motor phase sequence changed, or direction parameter mismatch | ✅ High | Perform a low-speed, unloaded jog under controlled conditions; compare old and replacement wiring photos | Verify resolver wiring and motor phase order; do not reverse wires at random |
| Position drifts or encoder/resolver count is unstable | Shield grounding error, cable damage, electrical noise, loose connector, resolver wear, or faulty module | ✅ Possible | Observe position feedback while stationary; gently flex cable at connectors; inspect shield termination per drawing | Repair cable/grounding issues first; replace module only after confirming unstable resolver signal |
| Fault occurs only when motor is hot | Resolver insulation breakdown, cable damage, motor thermal issue, cabinet heat, or module component drift | ✅ Possible | Trend fault time, motor temperature, and cabinet temperature; test feedback resistance cold and after warm-up | Check motor and cable first; thermal faults are frequently external to the module |
| Module failure suspected after a motor change | Incompatible resolver type, wrong excitation requirements, incorrect wiring, or unsupported motor feedback | ✅ High | Verify resolver transformation ratio, excitation requirement, connector pinout, and motor documentation | Never assume a replacement motor resolver matches the previous one |
| No improvement after module replacement | Original module was functional; fault resides in drive, control card, cable, resolver, or mechanics | ❌ Usually external | Reinstall the known-good module if safe and compare fault behavior; inspect drive diagnostics and cables | Preserve the original module until the root cause is confirmed |
❗ Feedback warning: Do not wire resolver leads from memory. Resolver interfaces can use different excitation, sine, cosine, reference, shield, and polarity conventions. A connector that physically fits does not prove electrical compatibility.
❗ Replacement warning: Take high-resolution photos of every connector, terminal, cable label, jumper, and module position before removal. I have seen a machine remain down for days because a technician replaced the suspected feedback module but reinstalled the resolver shield on the wrong termination point.
❗ ESD warning: Handle this module in an ESD-controlled area. Use a grounded wrist strap, hold the PCB only by its edges, and store it in an antistatic bag. A feedback interface can be damaged by static discharge long before anyone sees a fault code.
If the issue remains unresolved, provide technical support with photos of the B/M-60031-2 label, associated ABB drive nameplate, resolver connector, cable markings, complete fault text, and the resolver wiring drawing.
Frequently Asked Questions (FAQ)
What is the ASEA Brown Boveri B/M-60031-2?
The B/M-60031-2 is listed as an ABB resolver driver I/O module. It interfaces motor resolver feedback with a legacy ABB motion-control or drive system.
Is B/M-60031-2 the same as BM-60031-2?
In supplier catalogs, the part is commonly indexed as either B/M-60031-2 or BM-60031-2. Use the exact format shown on the installed module label for procurement records, and provide a label photo to the supplier. The slash, revision suffix, and any additional identifier can matter for legacy spares.
Can I replace it with a generic resolver-to-digital converter?
No. The module must match the existing ABB drive/control platform, resolver type, electrical interface, physical connector arrangement, and system configuration. A generic resolver interface may produce a signal that looks plausible but remains incompatible with the installed drive.
Will I need to retune the axis after replacement?
Usually, an exact like-for-like feedback module replacement should not require complete axis retuning if the motor, resolver, drive parameters, and wiring remain unchanged. However, you must perform a controlled low-speed verification before returning the machine to production. If the system loses position, hunts, or faults, stop immediately and verify wiring and compatibility.
Can I swap this module while the cabinet is energized?
No. Isolate control and drive power, follow lockout/tagout, allow the DC bus to discharge, and verify a safe state according to the machine procedure. Pulling or inserting legacy drive modules under power can damage the module, backplane, drive control electronics, or resolver circuit.
Why is a refurbished B/M-60031-2 less expensive than a new factory spare?
This is obsolete legacy equipment, so supply generally comes from independent surplus and repair channels. A refurbished unit may have been previously installed, inspected, repaired where needed, and functionally tested. Ask the supplier for the exact test scope, actual unit photos, repair disclosure, warranty, return policy, and ESD packaging details.
What should a supplier test before shipment?
At minimum, the supplier should verify the exact model and revision, inspect connectors and PCB condition, test power-related circuitry where applicable, validate resolver excitation and feedback processing in a compatible ABB test system, and provide a dated test record. Because public listings do not provide a verified OEM pinout or electrical specification for this exact module, request confirmation that testing occurred on the same drive family—not merely a visual inspection.
