Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE Fanuc |
| Model | IC697PWR748 |
| Product Type | PLC Power Supply Module |
| PLC Family | Series 90-70 |
| Input Voltage | 48 VDC nominal |
| Input Range | 35–60 VDC |
| Input Power | 160 W maximum at full load |
| Output Power | 90 W maximum |
| Output Voltage Rails | +5 VDC / +12 VDC / -12 VDC |
| +5 VDC Output | 18 A maximum |
| +12 VDC Output | 1.5 A maximum |
| -12 VDC Output | 1 A maximum |
| Rack Position | Leftmost slot |
| Backplane Connection | 48-pin connector |
| Rack Expansion | Supports second rack with IC697CBL700 |
| Protection | Overvoltage and overcurrent protection |
| Ride Through Time | 10 ms minimum |
| Construction | Slide-in rack mount |
| VME Compatibility | Supports VME standard C.1 |
The IC697PWR748 provides three regulated outputs: +5 VDC, +12 VDC, and -12 VDC, with a total output rating of 90 watts. GE Fanuc documentation also notes that one power supply can support two racks when the total system load remains within the supply rating.
Product Introduction
GE Fanuc IC697PWR748 Series 90-70 Power Supply Module
The GE Fanuc IC697PWR748 is the 48 VDC power supply module used in Series 90-70 PLC installations. It converts the incoming DC supply into the regulated backplane voltages required by CPU, communication, and I/O modules.
For maintenance teams supporting older Series 90-70 systems, the power supply is a critical spare because unstable DC rails can create symptoms that look like CPU, memory, or I/O failures. Before replacing the module, check the incoming 48 VDC source, rack loading, and backplane condition.
IC697PWR748
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
A PLC rack suddenly dropping offline during plant operation is often blamed on the CPU first. In many Series 90-70 systems, the actual cause is a degraded power supply, loose DC wiring, or an overloaded rack.
The IC697PWR748 sits at the foundation of the rack. If the +5 VDC rail drifts outside tolerance, multiple modules can fail together and create misleading diagnostics.
Typical Applications
- Manufacturing production lines — powering Series 90-70 CPUs, communication modules, and distributed I/O racks.
- Water and wastewater facilities — maintaining legacy PLC control panels for pumps, valves, and process equipment.
- Power utilities — supporting older control cabinets where Series 90-70 hardware remains in service.
- Process automation skids — providing rack power for dedicated machine or package controllers.
Technical Pitfalls to Avoid
- Do not replace a 48 VDC supply with a 24 VDC version.
The IC697PWR748 and IC697PWR724 have similar output ratings but different input voltage requirements. Confirm the incoming DC system before installation. - Check total rack loading before startup.
A replacement power supply may appear healthy while the rack exceeds the available current capacity. Calculate the load of CPU, communication, and I/O modules. - Inspect the second-rack connection.
When one power supply feeds two racks, the expansion cable and remote rack wiring become part of the power system. A damaged connection can create intermittent PLC faults. - Verify backplane voltage after replacement.
Do not rely only on the module LED status. Measure the +5 VDC rail during normal operating load conditions. - Check DC source quality.
Battery-backed 48 VDC systems can introduce ripple or transient issues that stress older power supply components.
Related Products
- GE Fanuc IC697PWR724
24 VDC version of the Series 90-70 90 W power supply. Similar output capability but different input voltage requirements. - GE Fanuc IC697PWR711
120/240 VAC or 125 VDC, 100 W power supply for larger Series 90-70 configurations. - GE Fanuc IC697PWR710
Lower-capacity 55 W AC/DC power supply option for Series 90-70 racks. - GE Fanuc IC697CHS790
Nine-slot Series 90-70 rack designed for standard PLC configurations using IC697 power supplies. - GE Fanuc IC697CHS770
Redundant Series 90-70 rack supporting dual-controller architectures. - GE Fanuc IC697CPU780
Series 90-70 CPU module commonly installed in systems powered by . - GE Fanuc IC697BEM731
Genius Bus Controller module requiring stable rack power for distributed I/O communication. - GE Fanuc IC697CBL700
Power supply extension cable used when one supplies a second rack.
Procurement Note
For purchasing records, specify:
GE Fanuc — Series 90-70 PLC Power Supply Module — 48 VDC Input — 90 W Output
Before approving a replacement, confirm:
- Incoming DC voltage is 48 VDC
- Rack module load calculation
- Single-rack or dual-rack configuration
- Expansion cable requirement
- Output voltage stability under operating load
This module is a straightforward hardware replacement when the electrical configuration matches. The main risks are usually incorrect input voltage selection, excessive rack loading, or hidden backplane issues rather than the power supply installation itself.
