MTM POWER PCMDS150 110S24WK-VT DC/DC Converter

Description

Key Technical Specifications

Product Introduction & Supply Chain Strategy

The MTM POWER PCMDS150 110S24WK-VT is a 150W DC/DC converter designed for decentralized power distribution in rolling stock (railway vehicles), industrial vehicles, and telecommunications systems. It accepts a wide 110V DC nominal input (50.4–154V range) compliant with EN 50155 railway standards and outputs regulated 24V DC at 6.25A. Common applications include supplying closed sub-systems in trains, trams, and battery-powered industrial equipment where galvanic isolation and transient protection are mandatory.

Buying this converter as New Surplus delivers critical supply chain security for rolling stock operators. MTM POWER lead times for PCMDS150 series typically run 12-16 weeks – unacceptable for emergency replacement scenarios. Refurbished units from decommissioned trains carry hidden risks: degraded primary capacitors, stressed switching transistors from thermal cycling, and unknown surge exposure. A failed DC/DC converter on a railway vehicle triggers service disruption, towing costs, and regulatory reporting. Downtime for a single passenger train exceeds $10,000 per hour. Our new surplus stock provides full 10-15 year expected service life, verifiable serial numbers, thermo-selective vacuum encapsulation intact (never cracked or re-potted), and a 2-year warranty. For fleet operators, we recommend strategic hoarding of 2-3 units per vehicle class before MTM POWER announces end-of-life (EOL) on this form factor.

PCMDS150 110S24WK-VT

Installation & Configuration Guide

Stage 1: Pre-Installation (Prep & Safety)

• Lock-out/tag-out (LOTO): Disconnect the 110V DC battery supply at the main disconnect. Verify zero voltage with a CAT III-rated multimeter.
• Tools: Insulated screwdrivers (flathead and Phillips), torque wrench (Nm spec), ESD strap, camera.
• Document wiring: Take photos of the terminal assignments. Label each wire: input (+), input (-), output (+V), output (-V), and RC (Remote Control) if used.
• Check physical fit: Dimensions are 160.5 × 115 × 65 mm Verify mounting plate has clearance for heat sink fins. The heat sink version requires 65mm depth.
• Verify contact cooling surface: The base plate must mount to a clean, flat metal surface for heat dissipation. Apply thermal paste if specified in OEM manual.

Stage 2: Removal

• Disconnect wiring: Remove wires from screw terminals. Note ferrule vs. bare copper.
• Remove mounting hardware: Typically four M4 or M5 screws securing the chassis to the mounting plate.
• Extract unit: Slide the converter off DIN rail (if used) or lift from chassis mounts.
• Inspect mounting surface: Clean old thermal compound residue. Surface must be flat within 0.1mm for proper contact cooling.

Stage 3: Installation (Clone & Seat)

• Apply thermal interface: Spread a thin, even layer of thermal compound on the mounting surface (if required).
• Secure the converter: Mount using original screws. Torque to manufacturer specification (typically 2-3 Nm for M4). Do NOT overtighten – cracks in the aluminum base plate compromise cooling.
• Reconnect wiring exactly as photographed:
  • Input (+) – 110V DC positive (typically brown or red)
  • Input (-) – 110V DC negative/return (typically blue or black)
  • Output (+V) – 24V DC positive to load (typically red)
  • Output (-V) – 24V DC return (typically black or blue)
  • RC – Remote Control (if used). Applying voltage to RC enables output.
• Verify polarity reversal: Reverse polarity on input destroys the converter instantly. Double-check.

Stage 4: Power-On & Testing

• Re-engage the battery disconnect.
• Measure input voltage at converter terminals: 50.4–154V DC present.
• Check Remote Control status: If RC is not wired, verify the converter has internal pull-up enabled. Some models require RC tied to input (+) for enable.
• Measure output voltage: 24V DC ±1% (23.76–24.24V) at no load.
• Load test: Apply 50% load (3.1A) using a resistive or electronic load. Voltage should remain within tolerance.
• Monitor for overheating: After 30 minutes at full load (6.25A), the heat sink should be warm but not too hot to touch (<80°C surface temp).
• Check for ripple: Use oscilloscope across output terminals. Ripple should not exceed specified value (refer to OEM datasheet, typically <100mV p-p).

Firmware/Software Versions & Upgrade Notes

The PCMDS150 110S24WK-VT is an analog DC/DC converter. It contains no firmware, no programmable parameters, and no software configuration.

• No firmware updates required: This is a hardware-only power conversion device.
• No compatibility issues: Any replacement unit of the same model number functions identically, regardless of manufacturing date.
• Key considerations:
  • If replacing an older MTM POWER converter with different output voltage (e.g., 12V or 48V version), verify the load is rated for 24V before installing.
  • The Remote Control (RC) pinout is consistent across all PCMDS150 variants. No configuration needed.

Frequently Asked Questions (FAQ)

Q: Why is this cheaper than OEM direct but more expensive than surplus/used units?
A: OEM sells at full list price with 12-16 week lead times. We sell new surplus from authorized overstock channels – same factory-sealed product, immediate shipment. Used units from decommissioned trains have unknown operating hours, degraded capacitors from thermal cycling, and may have been exposed to voltage surges or improper removal. A failed converter on a revenue train costs 10,000+ per hour in disruption plus towing fees. The 200 you save on a used unit disappears in the first 20 minutes of a service outage.

Q: Are these really new, or are they pulls from scrapped trains?
A: New original. Factory-sealed anti-static packaging. Zero operating hours. The thermo-selective vacuum encapsulation is intact – never cracked or re-potted. OEM packing slips and traceable serial numbers available upon request. We never sell pulls, refurbished, or repaired inventory.

Q: Is the PCMDS150 110S24WK-VT obsolete or end-of-life?
A: Not officially announced, but MTM Power continues to produce the PCMDS150 series as an active product line However, lead times for certain voltage/output combinations can extend to 16 weeks. For mission-critical rolling stock applications, we recommend maintaining 2-3 spare units per vehicle type as buffer stock against supply chain variability.

Q: What is the difference between base plate version and heat sink version (WK-VT)?
A: The heat sink version (WK-VT, WärmeKörper – Vented/Type) includes external cooling fins for convection cooling in free air. Dimensions: 160.5 × 115 × 65 mm . The base plate version (without heat sink) is 170 × 115 × 38 mm and requires direct contact cooling to a metal chassis The WK-VT variant is preferred for cabinet mounting where the chassis is not a sufficient heat sink.

Q: Can I hot-swap this converter while the 110V DC battery is connected?
A: No. Never disconnect or reconnect input power under load. The input capacitors charge rapidly, causing arcing at the terminals and potential damage to the converter or injury to personnel. Always disconnect the upstream battery breaker. Total downtime for safe replacement: 30-45 minutes including load testing.

Q: Does this converter require a minimum load?
A: No. The PCMDS150 series needs no ground load and is stable at zero output current .

Q: What is your warranty?
A: 2 years from invoice date. Covers manufacturing defects – failed switching transistors, capacitor degradation beyond spec, open/short circuits on input or output. Does not cover damage from reverse polarity, overvoltage on input (above 154V), physical damage, incorrect mounting (insufficient heat sinking), or water ingress if IP67 seal is breached.

Q: Do you provide test reports?
A: Yes. Every PCMDS150 110S24WK-VT ships with a QC Test Report including: input voltage range verification, output voltage at 0%, 50%, and 100% load, efficiency measurement, ripple measurement, and Remote Control function test. Signed by the testing technician.

Q: Can I use this converter in non-railway applications?
A: Yes. The wide input range (50.4-154V DC) makes it suitable for industrial battery systems, telecommunications (nominal 110V DC telco plants), solar battery banks, and electric vehicle auxiliary power. The rugged IP67-rated construction and -40°C to +70°C operating range also suit marine and off-highway equipment .