Key Technical Specifications
| Parameter | Specification | Field Note |
|---|---|---|
| Output Voltage | 24 V DC (Adjustable 24-28V) | Set via front potentiometer |
| Output Current | 10 A (Continuous) | 15A peak for 5s (PowerBoost) |
| Output Power | 240 W | Derate above 50°C ambient |
| Input Voltage | AC 100-240V (Wide Range) | Auto-sensing, no jumper needed |
| Efficiency | > 90% | Runs cooler, less cabinet AC needed |
| Ripple/Noise | < 20 mVpp | Clean power for analog I/O |
| MTBF | > 100,000 hrs | At 40°C, 230V AC input |
| Dimensions | 40 x 124 x 127 mm | Compact footprint saves rail space |
| Protection | OCP, OVP, SCP, OTP | Auto-recovery after fault clears |
| Certifications | UL, CSA, CE, ATEX | Safe for hazardous locations (verify class) |
Product Introduction
I’ve seen too many control cabinets fry because someone cheap’d out on the power supply. The PRSTECH DMP10.24-20 is the 240W workhorse that keeps your PLCs alive when the grid sags or a motor starter kicks in. It’s not just a box that makes 24V; it’s got active PFC and enough bulk capacitance to ride through 20ms brownouts without your HMI rebooting. If this thing dies, your entire line stops, and you’re explaining to the plant manager why you didn’t buy the redundant pair.We stock these because they actually survive the heat. Most PSUs derate like a rock above 40°C, but the DMP10.24-20 uses convection cooling and high-temp caps that hold up in unventilated panels. The PowerBoost feature gives you 15A for 5 seconds to handle inrush on capacitive loads or valve coils without tripping. Just don’t get lazy with the wiring; I’ve seen terminals melt because someone didn’t torque the screws to 1.2 Nm. This unit is bulletproof, but it demands respect.
Quality SOP & Tech Pitfalls
The Lab Report:
I don’t trust “tested” stickers. Here is what actually happens on my bench:
- Visual/Counterfeit Check: Inspect the transformer windings and capacitor brands. If the caps are generic or the solder joints are dull, it’s a fake.
- Load Bank Test: Hook up a 240W resistive load. Run it for 1 hour. Measure output ripple with an oscilloscope. If it’s >50mVpp, the output caps are dried out.
- Short Circuit Test: Short the output terminals. Verify OCP trips in <100ms and recovers when cleared. If it stays latched, the protection circuit is fried.
- Hi-Pot Test: Apply 3kV between input/output and chassis. Any leakage >1mA fails. Safety first.
- Burn-In & Seal: Run at full load for 4 hours in a 45°C chamber. Bag with desiccant immediately after. Moisture kills SMPS.
The Engineer’s Warning:
⚠️ The Torque Trap: These terminals are small. I’ve seen guys hand-tighten them, and six months later, the vibration loosens the screw, arcing melts the terminal block, and the PSU catches fire. Use a calibrated torque screwdriver: 1.2 Nm. No exceptions.⚠️ The Grounding Sin: Do not float the DC negative. Tie it to PE at the PSU terminal. Floating 24V DC picks up noise from VFDs and causes random PLC faults. I spent 3 days chasing a “ghost” I/O failure that was just a floating ground and a nearby 50HP drive. Ground it.
Installation & Configuration Guide
- Pre-Installation Safety: ⚠️ LOCKOUT/TAGOUT. Verify 0V AC at the input terminals. Take a photo of the old PSU wiring and the DIP switch/jumper settings. Do not trust your memory.
- Removal: Label input/output wires. Release the DIN clip. Cap the AC wires immediately. A stray wire touching the rail will arc and burn your panel.
- Installation: VERIFY THE JUMPERS. Does the new DMP10.24-20 have the same parallel/redundancy jumper settings as the old one? If you’re running redundant, ensure the decoupling module is installed. Mount on clean DIN rail. Torque terminals to 1.2 Nm.
- Power-On & Testing: Apply AC. Verify green LED. Measure output voltage. Adjust pot if needed (24.0V ±0.5V). Check for heat. If the case is too hot to touch (>60°C), you’re overloaded or the fan is dead.
Compatible Replacement Models
| Model | Status | Notes |
|---|---|---|
| PRSTECH DMP10.24-20 | ✅ Current Standard | Direct replacement. Best availability. |
| PULS CP10.241 | ✅ Modern Equivalent | Same specs, newer design. Drop-in. |
| PHOENIX QUINT-PS/1AC/24DC/10 | ⚠️ Software Compatible | Same form factor, but check redundancy module compatibility. |
| MEAN WELL NDR-240-24 | ❌ Hardware Mod | Different width (50mm vs 40mm). Requires DIN rail spacer or rewiring. Not recommended for tight panels. |
Frequently Asked Questions (FAQ)
Can I parallel two DMP10.24-20 units for more current?
No. Not without a redundancy module or active current sharing kit. If you just wire them together, one will hog the load and fail. Use the PRS redundancy module or buy a single 20A unit.My PSU keeps tripping OCP on startup. Is it bad?
Probably not. You’ve got too much capacitance downstream. The inrush is hitting the PowerBoost limit. Add a soft-start module or reduce the number of I/O modules you power up simultaneously. I’ve seen this on panels with 20+ analog cards.Does this support 120V AC input?
Yes. It’s auto-sensing 100-240V AC. Do not use the input voltage jumper. It’s automatic. If you’re on 120V, derate the output current by 20% (max 8A continuous).How do I know if it’s in PowerBoost mode?
You won’t see a light. PowerBoost is automatic for 5 seconds when current exceeds 10A but stays below 15A. If it stays in boost >5s, it will shut down. Check your load.Can I use this in a hazardous area?
Only if the specific suffix is ATEX/IECEx certified. Standard DMP10.24-20 is not for Class I Div 1. Check the data tag for “Ex” marking. If it’s not there, keep it out of the hazardous zone.Why is the output voltage drifting up to 28V?
The feedback optocoupler is likely failing. Replace the unit immediately. Do not try to adjust it down. Drifting voltage kills PLCs. I’ve seen 28V fry a $5,000 CPU module because someone tried to “trim” a dying PSU.Is the fan replaceable?
No. The DMP10.24-20 is convection-cooled. No fan. If it’s hot, your panel ventilation is the problem, not the PSU. Add a filter fan to the cabinet door.
