Description
Key Technical Specifications
- Input Voltage: 90–264VAC
- Input Current: 18.2A
- Output Voltage: 56VDC
- Output Current: 17.9A
- Output Power: 1000W
- Efficiency: 90%
- Operating Temperature: -20°C to +70°C
- Storage Temperature: -40°C to +85°C
- Humidity: 5% to 95% RH (non-condensing)
- Isolation Voltage: 2kVrms
- Hold-up Time: 20ms
- Cooling Method: Natural convection (fanless)
- Protection Functions: Overvoltage protection, short-circuit protection
- Dimensions: 270 × 260 × 40mm
- Weight: 3.87 kg
- Place of Origin: USA
Product Introduction
A 1kW single-phase power module sitting inside an industrial control cabinet, converting raw AC mains to a clean 56VDC rail — that is the PM3326B-6-1-2-E in a nutshell. Built by Pioneer Magnetics out of the USA, this unit handles the full 90–264VAC universal input range, meaning it works on any single-phase supply worldwide without rewiring. The 56VDC / 17.9A output feeds directly into drive systems, servo amplifiers, or any 56V bus architecture common in industrial automation and semiconductor test equipment.
Here is what makes this module worth tracking down: 90% efficiency in a convection-cooled, fanless package. No fan means no dust ingestion, no bearing failure, no airflow blockage killing your power supply at the worst possible moment. The 2kVrms isolation rating keeps your control-side circuits separated from the AC mains — critical when sensitive PLC I/O or communication modules share the same enclosure. At 270 × 260 × 40mm and 3.87 kg, it is not small, but it packs a kilowatt into a flat form factor that fits panel-mount configurations where DIN-rail PSUs cannot go.
Troubleshooting Quick Reference
| Fault | Likely Cause | Probability | Quick Check | Fix |
|---|---|---|---|---|
| No output voltage | Input power absent or wiring fault | 80% | Measure AC voltage at input terminals; verify 90–264VAC present | Check upstream breaker, fuses, and input cable connections |
| Output voltage present but unstable | Overloaded output or input voltage sag | 65% | Measure output current draw; compare against 17.9A rated max | Reduce load; verify input supply is within spec |
| Module shuts down intermittently | Thermal shutdown (overtemp) | 55% | Check ambient temperature near module; feel for excessive heat | Improve cabinet ventilation; ensure convection airflow path is unobstructed |
| Overvoltage protection trips | Output fault or load transient | 50% | Disconnect load; measure output with no load connected | If output is clean with no load, fault is downstream — check load wiring and components |
| Short-circuit protection latches | Shorted output wiring or load | 70% | Measure resistance across output terminals with power off | Isolate short in load or wiring; reset module after clearing fault |
| Module runs hot but does not trip | Degraded thermal interface or high ambient | 40% | Measure case temperature; compare against 70°C max operating spec | Relocate module to cooler area; add forced air if ambient exceeds design intent |
PIONEER MAGNETICS PM3326B-6-1-2-E 80026-529-01
Application Scenarios & Pain Points
Industrial automation control cabinets:
The 56VDC rail powers servo drives, solenoid valves, and actuator circuits. When this module fails, the entire cabinet goes dark — every axis, every valve, every I/O card downstream loses power simultaneously. The fanless design helps, but the 270 × 260mm footprint means you need real panel space reserved for it.
Semiconductor test equipment:
Test chambers and probe stations often require isolated, clean DC power at specific voltages. The 2kVrms isolation and 90% efficiency make this module a fit — but sourcing is the pain. Pioneer Magnetics modules are not stocked at mainstream distributors. You are dealing with surplus channels, mostly out of China, with lead times ranging from days to weeks.
Communication base stations and medical equipment:
The wide input range (90–264VAC) and tight regulation suit environments where power quality varies. Medical diagnostic equipment values the low EMI signature. The catch — if your application needs 24VDC instead of 56VDC, this module is the wrong tool entirely.
