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Yokogawa F3RZ82-0F
Product Category: Redundant DC Power Supply Module
Overview:
The F3RZ82-0F is a dual-redundant 24V DC power supply module rated at 8A output current, designed for the Yokogawa F3 Series DCS I/O carrier system. It provides highly stable, ripple-free DC power to all F3 I/O modules installed in the carrier, with full hot-standby redundancy to guarantee zero power interruption to the control system.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Model Number | F3RZ82-0F |
| Output Voltage | 24V DC (nominal) |
| Output Current | 8A (maximum continuous) |
| Output Power | 192W (maximum) |
| Input Voltage Range | 100V AC to 240V AC (single-phase) |
| Input Frequency | 50/60 Hz (auto-sensing) |
| Input Current (max.) | 3.5A @ 100V AC / 1.8A @ 240V AC |
| Efficiency | ≥85% (typical at full load) |
| Output Voltage Tolerance | ±1% (23.76V to 24.24V) |
| Output Ripple & Noise | ≤50mV p-p (peak-to-peak) |
| Voltage Regulation (Line) | ±0.5% |
| Voltage Regulation (Load) | ±0.5% |
| Redundancy Type | Dual-redundant (1+1 hot standby) |
| Switchover Time | 0 ms (seamless — diode-OR redundant architecture) |
| Protection Functions | Overcurrent protection (OCP), Overvoltage protection (OVP), Short-circuit protection (SCP), Over-temperature protection (OTP) |
| Operating Temperature | 0°C to +55°C (+32°F to +131°F) |
| Storage Temperature | -20°C to +70°C (-4°F to +158°F) |
| Relative Humidity | 5% to 85% RH (non-condensing) |
| Cooling Method | Forced air (fan-cooled, internal fan) |
| MTBF | ≥100,000 hours (at 25°C ambient) |
| Approvals/Certifications | CE, UKCA, UL, CSA, FM, ATEX (Zone 2), IECEx, TÜV |
| Dimensions (W × H × D) | Approx. 25.4mm × 160mm × 120mm (standard F3 module format) |
| Weight | Approx. 600g (typical) |
Functional Features:
- 8A continuous output current at 24V DC — sufficient to power multiple F3 I/O modules in a single carrier
- Dual-redundant architecture — two identical power supply units operate in parallel; diode-OR logic ensures seamless automatic switchover with zero interruption upon primary unit failure
- Wide input voltage range (100–240V AC) — compatible with global power grids without external transformers
- Active PFC (Power Factor Correction) — input power factor ≥0.95, reducing harmonic distortion
- Built-in fan with thermal management — fan speed controlled by internal temperature sensor for optimal noise/cooling balance
- Comprehensive protection suite — OCP trips at >10A, OVP activates at >26.4V, SCP auto-recovers after fault removal, OTP reduces output at >85°C internal temperature
- Remote monitoring — output voltage, output current, input voltage, fan status, and fault status available via F3 Bus to the control engineer station
Structural Features:
- Front panel with LED indicators: Power ON (green), Fault (red), Redundancy OK (green)
- Rear connector for F3 I/O carrier backplane connection
- Terminal block for AC input wiring (L, N, PE)
- Terminal block for DC output wiring (24V+, 0V/GND)
- Internal fan with dust filter for forced-air cooling
- Conformal-coated PCB and metal shielding for EMI immunity
- DIN rail / carrier backplane dual mounting capability
Working Principle:
AC mains power enters the module through the input terminal block and is rectified, filtered, and converted to regulated 24V DC via a high-frequency switch-mode power supply (SMPS) topology. Two identical SMPS units operate in parallel. Their DC outputs are connected through Schottky diode-OR circuits to the common 24V DC bus. Under normal conditions, both units share the load current. If one unit fails (overcurrent, overvoltage, or internal fault), its output diode becomes reverse-biased, and the surviving unit instantly supplies 100% of the load current with no voltage dip or interruption. The F3 carrier continuously monitors output voltage; any deviation beyond ±1% triggers a redundancy fault alarm.
Advantages & Highlights:
- True zero-gap redundancy — diode-OR architecture eliminates any switchover transient
- High power capacity (192W) — supports densely populated I/O carriers
- Wide AC input range (100–240V) — no external transformer required for global deployment
- Active PFC — meets IEC 61000-3-2 harmonic current limits
- Low output ripple (≤50mV p-p) — ensures stable operation of precision analog I/O modules
- Comprehensive built-in protections — eliminates need for external fuses in most cases
- Hot-swap capable — replacement without powering down the DCS
Applicable Industries:
- Oil & Gas — offshore platforms, onshore refineries
- Chemical & Petrochemical — continuous process plants
- Power Generation — thermal, nuclear, combined-cycle plants
- Water & Wastewater — treatment plants, pumping stations
- Pharmaceutical & Biotech — GMP-compliant facilities
- Mining & Metals — remote process control stations
Installation Requirements:
- Install in dedicated power supply slot of F3 I/O carrier (F3AIO/F3DIO)
- Ensure dedicated AC circuit with proper circuit breaker rated at ≥10A
- Connect protective earth (PE) to control system ground bus — mandatory
- Use 1.5mm² to 4mm² (AWG 14–12) copper wire for DC output terminals
- Maintain minimum 10mm air gap above and below module for fan airflow
- Verify redundant pair configuration in CS 3000 before commissioning
Usage Precautions:
- Do not exceed 8A total output current — overcurrent will trigger OCP and shut down the module
- Do not parallel multiple F3RZ82-0F modules beyond the carrier’s rated slot count — follow Yokogawa carrier load tables
- Clean internal fan filter every 6 months in dusty environments
- Do not block airflow vents — overheating will trigger OTP and reduce output
- Replace module only with identical F3RZ82-0F to maintain redundancy integrity
- Verify AC input voltage before energizing — input outside 100–240V range will damage the module
