Description
Product Introduction & Engineering Value
When an RX7i rack expands with power-hungry CPUs, motion controllers, and multiple Ethernet cards, standard supply units drop voltage under load, causing silent backplane resets. The IC698PSA350 eliminates system brownouts by delivering up to 350 Watts of regulated DC power straight across the VME64 backplane rails.
Designed for heavy industrial environments, this module accepts a wide AC input range while delivering isolated +5V, +12V, and -12V power channels. It features front panel test points for quick multimeter verification, front-accessible diagnostic LEDs, and integrated overvoltage and overcurrent protection to safeguard expensive downstream processing hardware.
Technical Specifications
| Parameter | Specification Details |
| Input Voltage Range | 85 to 264 VAC (Nominal: 100–240 VAC) |
| Input Frequency | 47 to 63 Hz |
| Max Output Power | 350 Watts continuous total output |
| +5 VDC Output | Up to 60.0 A max capacity |
| +12 VDC Output | Up to 7.0 A max capacity |
| -12 VDC Output | Up to 1.0 A max capacity |
| Backplane Slot | Dedicated left-most power supply slot in RX7i rack |
| Hold-up Time | 20 ms minimum at full rated load |
| Status LEDs | AC Power, DC Power, Over-temperature, System Failure |
Field Application & The “Trench” Experience
A glass manufacturing line in Texas began experiencing intermittent, unexplained RX7i CPU halts during peak production hours. Initial troubleshooting targeted the PLC program, but an oscilloscope trace on the backplane reveal revealed the +5V bus dropping to 4.65V whenever the high-density analog modules pulled peak current. The existing supply was degraded after years in a hot enclosure. Our field team racked in a fresh IC698PSA350, verified stable 5.05V delivery across all backplane slots, and brought the furnace temperature control loop back online in under 30 minutes.
Niche Application Scenarios:
- Automotive Stamping Line Racks: Supplying high peak currents to multi-axis co-processor modules during rapid cycle changes.
- Milling Plant Elevator Systems: Operating reliably through line voltage dips in noisy 240VAC municipal grid environments.
- Offshore Rig Ballast Control: Delivering filtered DC power to sensitive communication and safety shutdown racks.
- IC698PSA350
- IC698PSA350
Transparency SOP: QA & Testing
- Step 1: Thermal & Capacitance Analysis — Capacitors are inspected for ESR degradation; thermal imaging checks transformer coils for heat stress under ambient conditions.
- Step 2: Full-Load Bank Testing — The module is tied to an electronic load bank drawing maximum 60A on the +5V rail and 7A on the +12V rail simultaneously for 12 continuous hours.
- Step 3: Line Sag & Hold-Up Verification — Input AC voltage is intentionally dropped to 85 VAC to ensure the hold-up circuit maintains backplane voltage within tolerances without tripping CPU resets.
- Step 4: Output Ripple Inspection — High-frequency ripple and noise are measured via oscilloscope to guarantee clean DC power delivery below OEM ripple limits.
The Veteran’s Tech Trap Guide
- ⚠️ The +5V Current Overshoot: Do not calculate your power needs by counting rack slots alone. Sum the exact +5V current requirements of every card (especially high-draw CPUs and Ethernet modules like the IC698ETM001). Exceeding 60A on the 5V rail will trip the internal thermal protection, dropping the entire rack without warning.
- PRO TIP (Airflow Clearances): The IC698PSA350 generates substantial heat at full load. Always maintain a minimum of 3 inches of unblocked vertical clearance above and below the RX7i rack. Installing ducting or cable trays directly against the bottom ventilation grilles will cook the internal primary capacitors within 18 months.
- ⚠️ Grounding Bond Pitfall: Never rely solely on the backplane chassis screws for protective grounding. Always attach a dedicated 12 AWG earth ground wire to the protective earth terminal on the front face of the power supply before applying mains voltage.
Dynamic FAQ
Q: Can I install two IC698PSA350 modules in a single RX7i rack for load sharing or N+1 redundancy?
A: No, the RX7i backplane architecture does not support active load sharing or redundant power supply configurations using standard PSA series modules.
Q: What does the red OVERTEMP light on the front panel indicate?
A: The OVERTEMP light indicates that internal heat sinks have exceeded safe operating limits. The supply will automatically shut down output power to prevent component destruction; check fan tray operation and filter cleanlines immediately.
Q: How can I quickly test the voltage outputs without removing the module from the rack?
A: The front panel features physical test points for +5V, +12V, -12V, and Logic Ground, allowing direct multimeter probe measurements while the rack is live.
Q: Are replacement fuses user-serviceable inside the ?
A: The internal AC input fuse is soldered directly to the main PCB board to meet safety standards. If the fuse blows, it indicates a primary-side short circuit requiring bench-level repair rather than a simple fuse swap.
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