Product Core Brief

• Model: DPW01, full part number P37611-5-8018181
• Brand: ABB (Hartmann & Braun)
• Series: Freelance 2000 legacy DCS
• Core Function: Convert universal AC mains input to stabilized 24VDC power to feed Freelance CPU, DLM mixed I/O and communication interface racks
• Product Type: DIN rail mounted enclosed switch-mode power supply unit
• Key Specs: 100–240VAC universal input | 24VDC 5A 120W continuous output | OVP, OCP, auto-recovery short-circuit protectionNote: Discontinued legacy DCS power hardware, new original and new surplus units stocked with factory anti-static packaging.

Key Technical Specifications

• AC input range: 100–127VAC (3A max) / 220–240VAC (1.4A max), 50/60Hz
• DC output rating: 24VDC ±10%, 5A continuous, total 120W power
• Conversion efficiency: Minimum 85% under full rated load
• Integrated protection circuits: Overvoltage shutdown, constant-current overload limiting, auto-recovery short-circuit protection
• Status indicators: Two front-panel LEDs for mains present and regulated 24VDC output active
• Mechanical mounting: Standard TS35 DIN rail clip-on installation
• Physical dimensions: 100mm W × 120mm H × 128mm D
• Unit mass: 0.86kg
• Enclosure rating: IP20, ventilated metal chassis for passive heat dissipation
• Operating ambient temperature: -20°C to +60°C full load; performance degrades linearly above +60°C
• Storage temperature: -40°C to +85°C, 5–95% RH non-condensing
• Certifications: CE, UL, IEC 61010 industrial safety standard
• System compatibility: Exclusive to Freelance 2000 DCS racks; incompatible with S800 AC800M, S500 AC500, Mod300 S100 platforms

Product Introduction

This enclosed switch-mode supply delivers consistent 24VDC SELV power to all rack-mounted control and I/O hardware within a Freelance 2000 distributed control cabinet. Its universal AC input eliminates separate transformer setups for 120V and 230V global plant sites.

Auto-recovery short-circuit limiting prevents permanent damage during field wiring faults; the unit resumes normal output once the short condition clears without manual power cycling. Passive ventilation removes reliance on cooling fans that introduce maintenance points and dust ingress risks.

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference serial numbers against OEM Freelance 2000 component databases; inspect metal chassis for dents, terminal screw spring tension, LED functionality, and ventilation grille blockages; validate unbroken factory anti-static packaging seals for surplus inventory.
2. Live Testing: Mount the unit to a TS35 DIN rail test bench paired with a variable AC mains source and 120W resistive DC load bank; run continuous 24-hour full-load cycling at both 120VAC and 230VAC input ranges; log steady 24VDC output ripple with a Fluke 115 multimeter through the full test cycle.
3. Electrical Testing: Inject overvoltage AC input and DC output short-circuit faults to verify automatic shutdown and self-recovery operation; measure isolation resistance >10MΩ between AC mains terminals and DC output ground.
4. Firmware/Config Backup: No programmable firmware on this unit; photograph front screw terminal pin labeling for mains and DC load wiring for commissioning reference.
5. Final QC & Packaging: Torque all AC/DC terminal screws to OEM specified torque values; place unit in static-dissipative foam, attach a serialized QC test tag, then seal in original factory packaging for shipment.

Installation Pitfalls & Guide (Engineer to Engineer)

❗Underrated Mains Circuit Breaker Risk: Fitting a 10A breaker for dual installations creates nuisance tripping during cold-start inrush current. Result: Unplanned full DCS rack power loss mid-process run. Mitigation: Size each dedicated AC branch for a minimum 6A slow-blow breaker per unit.❗Overloaded DC Output Risk: Stacking more than eight DLM01/DLM02 I/O modules on a single unit exceeds the 5A continuous rating. Result: Chronic low 24VDC voltage, intermittent CPU comms timeouts, and fault LED flicker. Mitigation: Split dense I/O racks across two separate power supplies for load balancing.❗Unisolated Ground Loop Risk: Tying AC protective earth and DC 0V common to separate cabinet ground bars creates circulating ground noise. Result: Spontaneous DLM I/O channel flutter and false interlock alarms. Mitigation: Link DC negative return to the same chassis PE ground bar per Freelance wiring diagrams.❗ESD Dangers: Un-grounded technicians transfer static discharge to internal switching semiconductors; field records show static damage causes permanent output foldback with replacement costs exceeding $1,200 including downtime labor. Mitigation: Maintain continuous chassis ground contact for three full seconds before handling the unit and wear certified anti-static wrist straps during all cabinet work.

4-Step Replacement Guide

1. Pre-install: Set all Freelance rack controllers to manual hold mode to freeze discrete and analog control loops; photograph all AC mains L/N/PE wiring and DC 24V/0V load terminal connections on the unit.
2. Removal: Disconnect AC mains circuit breaker and wait 5 minutes for internal bulk capacitors to discharge; remove all DC load wiring one terminal at a time, then unclip the unit vertically from the DIN rail.
3. Install: Clip the new unit fully onto the TS35 DIN rail and secure chassis PE ground lug to the cabinet earth bar; replicate all photographed AC and DC terminal wiring connections with matching torque tension.
4. Power-on Test: Close the AC breaker and confirm both front-panel LEDs illuminate solid green; measure 23.5–24.8VDC no-load output voltage, connect full rack I/O load and verify no output voltage drop below 22.8VDC after 30 minutes of continuous operation before returning controllers to automatic control mode.

FAQ (Frequently Asked Questions)

Q: Can this unit operate alongside DPW02 in a redundant parallel power architecture?A: Parallel redundant operation is not factory-rated. The internal current-sharing circuitry is absent; mismatched output drift will force one unit to carry 100% of the rack load while the second sits idle, negating redundancy benefits. Deploy separate dedicated units for split rack loads instead.

Q: Does this unit support hot-swapping while the rack DC load remains energized?A: Hot-swap is not approved. Removing the unit while downstream I/O hardware stays powered creates reverse DC feed into the output stage, which can blow internal power FETs. Full upstream AC isolation and capacitor discharge is mandatory before removal.

Q: What warranty coverage applies to stocked surplus units?A: All surplus inventory carries a 12-month limited warranty covering factory manufacturing defects only. Damage from overloaded DC loads, ungrounded ESD exposure, undersized AC breakers, and parallel mismatched power stacking is excluded from warranty coverage.

Q: Can a single failed internal power component be repaired on-site instead of full unit swap?A: Field disassembly voids safety isolation certification and compromises passive thermal ventilation design. Standard site maintenance procedure requires full unit replacement for any permanent output foldback or LED fault condition.

Q: Is the unit certified for Class 1 Div 2 hazardous area direct cabinet mounting?A: No intrinsic safety certification exists for the unit assembly. Hazardous zone installations require full Freelance rack mounting inside a certified flameproof enclosure to meet area classification standards.

Q: What long-term upgrade path exists as this unit reaches OEM end-of-support?A: Freelance 2000 platform migration to System 800xA replaces this unit with standard S800 DIN rail 24VDC supplies. Full cabinet rework, load splitting, and complete control logic conversion is required to match new power distribution register mapping for AC800M controllers.

Q: What is the maximum allowable DC cable run length from the unit to remote I/O stations?A: Maximum 30m shielded 14AWG twisted pair DC cable without measurable voltage drop under full 5A load. Longer runs require thicker 12AWG conductors to avoid voltage sag at remote DLM I/O modules.