Product Core Brief
- Model: SA811F
- Brand: ABB
- Series: AC 800F / Freelance DCS
- Core Function: Delivers higher-output regulated DC power to the AC 800F CPU motherboard and local I/O slots, especially for PM803F-based configurations.
- Product Type: AC 800F High-Output Power Supply Module
- Key Specs: 115–230 VAC input | 3.3 VDC 6.5 A + 5.0 VDC 5.5 A | 35 W max output | P-slot only
- Condition: New Original / New Surplus (verify by part number)
Key Technical Specifications
- Input Voltage: 115–230 VAC (90–260 VAC operating range)
- Input Frequency: 50/60 Hz (47–63 Hz)
- Output 1: 3.3 VDC ±3%, 0.5–6.5 A
- Output 2: 5.0 VDC ±3%, 0.5–5.5 A
- Total Output Power: 35 W max
- Current Limit: Approx. 7.5 A
- Installation Slot: P-slot (leftmost slot of AC 800F base unit)
- Ride-Through: Output hold ≥20 ms during AC loss
- Protection: Short-circuit, overcurrent, input/output voltage monitoring; auto-recovery after fault clearance
- Diagnostics: Front LEDs (Power, Failure, Run/Stop, Prim/Sec), 9-pin diagnostic port with EMC filter, 512-byte serial EEPROM for fault logging
- Fuse: 2.5 AT glass fuse on input side
- Weight: 460 g
Product Introduction (No Fluff)
The SA811F is the higher-capacity AC power supply for ABB AC 800F controllers. It converts 115–230 VAC mains into regulated 3.3 VDC and 5.0 VDC rails that feed the CPU, communication modules, and local I/O slots.
Its advantage over the SA801F is straightforward: 35 W versus 26.5 W, with higher current on both rails (6.5 A / 5.5 A vs. 5 A / 5 A). That extra headroom matters when running PM803F CPUs with multiple communication or fieldbus modules loaded. Like its sibling, it must sit in the P-slot and provides ≥20 ms ride-through to prevent nuisance resets during brief mains dips.
QA & Testing SOP (Dynamic & Transparent)
For surplus AC 800F power modules, we verify electrical health before shipping.
- Inbound verification — Confirm SA811F marking, hardware revision, connector condition, and absence of burn marks or swollen capacitors.
- Insulation and continuity check — Verify input terminals, PE bonding, and no short between AC input and DC output rails before energizing.
- Bench power-up — Apply 115 VAC and 230 VAC separately. Confirm Power LED, stable 3.3 VDC and 5.0 VDC, and no abnormal heating.
- Load verification — Check output voltage under load, ripple, and load regulation using an electronic load or compatible test rack. Verify current capacity meets the 6.5 A / 5.5 A spec.
- Ride-through and diagnostics — Verify fault LED behavior, diagnostic port response, and EEPROM logging; pack in anti-static shielding with terminal protection.
Installation Pitfalls & Guide (Engineer to Engineer)
❗ P-slot only. The SA811F must be installed in the leftmost P-slot. Placing it in a CPU or I/O slot can damage the module and the backplane.
❗ Do not mix SA811F and SD812F blindly. SA811F is 115–230 VAC; SD812F is 24 VDC. They are not drop-in substitutes without verifying the cabinet power architecture.
❗ SA801F → SA811F upgrade requires firmware verification. Replacing an SA801F with an SA811F may require Control Builder F version upgrade (typically V7.1 or later). Check your project’s CBF version before swapping.
❗ Never hot-swap the power module. System documentation explicitly prohibits inserting or removing the power supply while the system is energized.
Replacement steps:
- Back up the AC 800F project and confirm redundancy state if applicable.
- Remove AC power, verify zero voltage, and disconnect the SA811F input connector.
- Release the P-slot module and remove it without forcing adjacent cards.
- Install the replacement, reconnect AC, verify LEDs, and confirm CPU Run/Stop status.
Technical FAQ
What’s the difference between SA811F and SA801F?
The SA811F delivers 35 W (3.3 VDC 6.5 A + 5.0 VDC 5.5 A), while the SA801F delivers 26.5 W (5 A on both rails). The SA811F is recommended for PM803F applications with heavier module loads.
Can I replace SA801F with SA811F directly?
Physically yes, but your Control Builder F software version must support the SA811F. Older CBF versions (pre-V7.1) may not recognize it. Verify your project’s CBF version before upgrading.
Does it support hot-swap?
No. ABB documentation explicitly prohibits inserting or removing the power supply while the system is energized.
What is the typical warranty?
Warranty depends on condition and supplier terms. For surplus stock, expect a limited functional warranty rather than a full OEM new-product warranty.
Is the SA811F still available?
It is a legacy AC 800F component. New surplus and verified replacements are still obtainable, but long-term projects should plan a migration path to a supported platform.
