Description
Product Introduction
The IC695PSD140A is a multi-purpose 40-Watt power supply in the PACSystems RX3i series. It takes 18-30 VDC input and works in both standalone and redundant configurations on universal backplanes. Emerson designed this version specifically for load-sharing applications.
The big difference from standard supplies is the redundancy support. In our experience, this gives plants better uptime options without jumping straight to bigger 120W units. It still delivers the usual +5.1V, +3.3V, and isolated +24V relay outputs.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Voltage | 18 to 30 VDC |
| Output Power | 40 Watts |
| Outputs | +5.1 VDC, +3.3 VDC, +24 VDC relay |
| Redundancy Capability | Yes, load sharing |
| Input Power Consumption | 60 Watts max |
| Protection | Overcurrent, overtemperature |
| LED Indicators | Power, Fault, Overtemp, Overload |
| Operating Temperature | 0°C to 60°C |
Application Scenarios & The “Trench” Experience
A pharmaceutical plant had a single power supply fault take down a critical clean room rack. Hours of lost validation data. We installed a pair of IC695PSD140A units in redundant mode. Now if one drops, the other carries the load seamlessly. No more single points of failure.
- Pharma Manufacturing – Critical process control – Redundant pair keeps validation systems running during supply faults.
- Oil & Gas – Remote instrument racks – Load sharing on 24VDC battery systems improves reliability.
- Automotive – High availability test stands – Quick failover without rebooting the CPU.
- Wastewater – Pump control panels – Handles environmental temperature swings while sharing load.
One food packaging OEM standardized on these for redundant power in their machines. During FAT, one supply was intentionally failed. The system stayed up. Customer signed off immediately.
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual RX3i racks.
- Inbound Inspection – Check terminals, revision, and physical condition.
- Live Rig Testing – Single and dual redundant load tests with RX3i modules.
- Electrical Parameter Checks – Measure output voltages, current sharing balance.
- Firmware/Indicator Verification – Test all diagnostics and fault signaling.
- Final QC & Anti-static Packaging – Extended burn-in under load, proper ESD protection.
Real redundant configuration testing included.
- IC695PSD140A
- IC695PSD140A
The Veteran’s Tech Trap Guide
⚠️ Redundancy setup is not automatic. You must configure and wire both supplies correctly. Wrong diode OR-ing or cabling will cause issues.
❗ Current sharing only works when both units are healthy. Monitor the load balance. One weak supply can drag the pair down.
⚠️ Input source matters for true redundancy. Feed each supply from separate breakers or battery banks. Common input defeats the purpose.
One thing to watch out for is output voltage matching. Slight differences between units can cause uneven loading. Check specs before pairing older and newer revisions.
Frequently Asked Questions
Does the IC695PSD140A support hot-swapping? In redundant setups, yes — you can replace one while the other carries the load. Single supply still requires shutdown.
What makes the “A” version different? It includes specific hardware for load sharing and redundancy applications.
Can I use it alone or must it be in pairs? It works fine as a standalone 40W supply. Redundancy is optional.
How much power can two units share? Combined they can support higher loads, but stay within individual 40W ratings and rack limits.
Why buy this surplus model? Fully tested units with redundancy capability at better pricing and immediate availability.
Will it work with my existing RX3i rack? Yes, on universal backplanes. Verify total power consumption for your module configuration.
What happens if one supply fails in redundant mode? The second unit takes the full load with minimal interruption, usually within one logic scan.
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