Omron S82J-05024DD Switch Mode Power Supply

Discontinued model (Order acceptance terminated in March 2011). It is an older 50W industrial switch mode power supply of the S82J series, widely used for 24V power supply in control cabinets. Only second-hand or stock spare parts are available on the market.

1. Model Decoding S82J-05024DD

2. Core Electrical Specifications

Input Voltage: AC85～264V wide universal input, 50/60Hz, compatible with global power grids

Output Rating: DC24V, 2.1A, 50W

Output Adjustment: V.ADJ potentiometer, ±10% voltage trim

Protection Functions: Overcurrent protection (105~160% rated current, foldback type, auto-recovery), short-circuit protection; No overvoltage protection for 50W variant

Cooling: Natural convection cooling, fanless

Efficiency: Typical >75%

Withstand Voltage: Input to output AC3000V isolation

Safety Certifications: UL508, cUL, EN50178, CE; EMC EN61204-3 Class A

Mounting: Dual-purpose: DIN rail mounting and panel mounting

3. Terminal Definition (Front Terminals)

L: AC Line

N: AC Neutral

⎓: Protective Earth (PE)

+V: DC24V Positive

-V: DC24V Negative

V.ADJ: Output voltage adjustment potentiometer

4. Installation & Operation Notes
5. Natural convection cooling. Maintain ≥25mm clearance top and bottom for ventilation; do not seal inside enclosed housing. Clean dust periodically in dusty environments.
6. Terminal tightening torque: 0.5~0.8 N·m to prevent loose connections and overheating.
7. Do NOT feed power directly from VFD output side. Fuse is recommended on input side.
8. After overcurrent / short-circuit protection triggers, remove the load, power off and wait approximately 90 seconds for auto-reset.
9. Replacement Selection (Discontinued Substitute Options)
10. Omron OEM recommended: S8JX-N050CD (S8JX series, 50W 24V DIN rail). Dimensions differ; adapter bracket available to fit original mounting holes.
11. New generation upgrade: S8VK-C05024 (S8VK series, currently active product, 50W/24V DIN rail, improved protection, recommended for new projects).
12. Domestic compatible alternatives: Meanwell LRS-50-24, Delta PMC-050-24, same power rating, DIN rail mount. Note difference in mounting cutout dimensions.
13. Common Troubleshooting (Key Inspection Points for Second-hand Spares)
14. No DC output while AC input is normal

Check blown internal input fuse (do not replace without evaluating backend short circuit)

Aged electrolytic capacitors with bulging tops (common failure for old units; capacity degradation highly likely after over 10 years of service)

2. Low output voltage, voltage drop under load

Degraded electrolytic capacitors; latent short circuit in load; loose terminal screws

3. Protection trips immediately upon power-on

Short circuit on output side; internal power device breakdown; rectifier bridge damaged by input surge

Second-hand inspection procedure: Measure no-load output voltage → Ripple test under load → Long-duration temperature rise test at full load. Focus inspection for capacitor leakage and bulging.

7. Spare Parts & Foreign Trade Information

HS Code: 85044014 (Static converter, switch mode power supply)

Weight: approx. 0.8~1kg

Procurement Reminder: Brand new original factory stock is exhausted. When purchasing second-hand units, verify appearance, repair traces and capacitor condition; prioritize units with load test reports.

Omron S82J-05024DD (50W, metal housing + DIN rail bracket) Overall Dimensions

Unit: mm

Length (horizontal, terminal side): 161 mm

Height (vertical): 97 mm

Depth (cabinet front to rear): 46 mm

The covered model shares the same main body dimension as bare PCB version. The DD version is equipped with DIN rail clips, maximum outward protrusion 12mm (max 9mm in sliding state).

Panel Mounting Holes

Side mounting holes: 2×M3.5, hole diameter 3.5mm

Terminal region: Terminals protrude approx.7mm forward from main body, reserve this space during cabinet layout.

Weight

Main body approx. 400g (without DIN rail bracket); complete unit with DIN rail clip approx.450g

Dimension Comparison for Replacement Models

1. S8VK-C05024 (new Omron 50W 24V DIN rail PSU): 125 × 90 × 40 mm, narrower width, different mounting cutout. Modification or adapter bracket required for direct replacement.
2. Meanwell LRS-50-24: 129 × 97 × 30 mm, smaller depth.

Note: S82J-05024DD is older thick form factor. During cabinet layout, reserve minimum 55mm front-rear space (46mm depth +7mm terminal protrusion), ≥25mm ventilation gap top and bottom.

Omron S82J-05024DD English Wiring Instructions

Model: S82J series 50W 24V DIN rail SMPS, front terminal sequence (top to bottom): L, N, PE, +V, -V; V.ADJ trim potentiometer on side.

1. Terminal Definition

Indicator: Green DC ON LED illuminates when power is normal with output; OFF when no output or under protection.

2. Standard Wiring Procedure
3. Power-off operation: Confirm upstream circuit breaker is disconnected before wiring. Never work with live power.
4. AC Input Side Wiring

L: Connect to AC220V live line

N: Connect to AC220V neutral line

FG earth terminal reliably bonded to cabinet PE protective earth

Wide input range AC85~264V, no voltage selector switch, globally applicable.

3. DC Output Side Wiring

+V → Load DC24V positive

-V → Load DC0V negative

Strictly prohibit shorting +V and -V; short circuit will trigger foldback overcurrent protection.

4. Terminal Tightening: Screw torque 0.5～0.8 N·m to avoid hot loose contacts.
5. Pre-power Check: Verify no short circuit on input/output, no polarity reversal. Power on under no-load condition, measure +V/-V voltage and confirm green LED lights up.
6. Load Test: Connect load only after no-load test passes.
7. Recommended Cable Gauge

AC input cable: ≥0.75mm² stranded copper wire

DC output cable: ≥1.0mm² stranded copper wire; use larger gauge for long cable runs to reduce voltage drop.

4. Important Operational Precautions
5. Protection Characteristics: Overcurrent and short-circuit protection are auto-reset type. Remove fault load, power off and wait approx.90 seconds for recovery. This 50W model has NO built-in overvoltage protection.
6. Prohibited Operations

Do NOT connect VFD output to L/N terminals of power supply

Reverse polarity on output terminals will damage the unit

Multiple S82J-05024DD units cannot be directly paralleled for power expansion (this low-power S82J does not support parallel operation)

3. Heat Dissipation: Natural convection cooling, maintain ≥25mm ventilation clearance top and bottom. Do not seal.
4. Earthing Requirement: FG terminal must be earthed. Unearthed unit carries electric shock hazard and higher EMI noise.
5. Potentiometer Adjustment: Do not turn V.ADJ to extreme limit in one step; adjust slowly while measuring voltage.
6. Fault Diagnosis

Green LED off after power-on: Check AC input, blown internal fuse or damaged power supply.

Green LED ON, voltage drops under load: Overloaded load, cable voltage drop or aged power supply with degraded capacitors.

Output cuts off immediately after power-on: Short circuit on output or leakage fault on load.