ABB SNAT 633 PAC – Relay Output Module | ACS 600 / ACS 800 Drive Platform
Engineering Background
The ABB SNAT 633 PAC is a dedicated relay output expansion module engineered for ABB’s ACS 600 and ACS 800 series variable-speed AC drives. Designed to extend the digital output capability of the drive control board, this module provides hardwired relay contacts for fault signaling, run/stop status, and auxiliary control functions in demanding industrial environments. It is a factory-original ABB component, manufactured to IEC 61800 series standards for power drive systems.
Product Positioning
The SNAT 633 PAC is the preferred relay interface solution for system integrators and OEM machine builders who require deterministic, galvanically isolated output signals from ACS 600/800 drives without external relay panels. Its plug-in form factor and direct backplane connection eliminate field wiring complexity and reduce panel footprint — a critical advantage in retrofit and capacity-expansion projects.
Complete Technical Specifications
- Part Number: SNAT 633 PAC
- Manufacturer: ABB Ltd. (Drive Products Division)
- Compatible Platforms: ACS 600 series, ACS 800 series AC drives
- Module Type: Relay Output Expansion Module
- Output Type: Electromechanical relay contacts (NO/NC)
- Isolation: Galvanic isolation between relay contacts and drive logic
- Rated Contact Voltage: 250 V AC / 30 V DC
- Rated Contact Current: 2 A (resistive load)
- Operating Temperature: 0 °C to +55 °C (storage: −40 °C to +70 °C)
- Humidity: 5–95 % RH, non-condensing
- Mounting: Direct plug-in to ACS 600/800 control board slot
- Weight: approx. 6.8 kg (packaged)
- Compliance: CE, IEC 61800-3, RoHS
- Country of Origin: Finland / EU
Proven Application Environments
- Pulp & paper mill drive systems — fault relay signaling to DCS/SCADA
- Water & wastewater pump drive panels — run/fault status to PLC digital inputs
- Steel rolling mill auxiliary drives — hardwired interlock outputs
- HVAC central plant AHU/chiller drives — BMS integration relay outputs
- Marine & offshore variable-speed drive cabinets — IEC-compliant relay isolation
- Mining conveyor and hoist drives — safety relay chain integration
Engineering Advantages
- Galvanic Isolation: Relay contacts are fully isolated from drive logic, protecting PLC/DCS inputs from drive-side transients.
- Plug-In Architecture: Zero-tool installation into the ACS 600/800 option slot — no additional wiring harness required.
- Deterministic Response: Hardware relay output ensures signal integrity independent of drive firmware state.
- Wide Contact Rating: 250 V AC / 2 A contacts accommodate both 24 V DC control circuits and 230 V AC auxiliary loads.
- Long Service Life: ABB-rated mechanical endurance suitable for continuous industrial duty cycles.
- Direct OEM Replacement: Factory part number ensures 100 % form-fit-function compatibility — no parameter reconfiguration required.
System Architecture & Signal Flow
The SNAT 633 PAC connects directly to the option module slot on the ACS 600/800 main control board (NAMC / RMIO board). The drive firmware maps configurable relay output parameters (e.g., Group 14: Relay Outputs in ACS 800 parameter set) to the physical relay contacts on the module. Signal flow: Drive control logic → SNAT 633 PAC relay coil → isolated NO/NC contacts → field wiring terminal → PLC/DCS digital input or auxiliary load. No external power supply is required for the relay coil; the module draws logic power from the drive backplane.
Sourcing & Quality Verification
- Stock Condition: Verified surplus / refurbished — each unit inspected prior to dispatch.
- Traceability: Original ABB part markings, label, and revision code intact.
- Testing: Functional relay contact continuity and isolation resistance verified.
- Packaging: Anti-static bag + foam-lined carton for safe international transit.
- Lead Time: In-stock units ship within 1–3 business days; contact us for volume availability.
- Warranty: 90-day Konmask operational warranty against DOA/latent defects.
Procurement Process
- Confirm your ACS drive model and control board revision with your ABB drive documentation.
- Verify SNAT 633 PAC is listed as a compatible option module in your drive’s hardware manual.
- Submit your purchase order or RFQ to support@konmask.com with quantity and delivery address.
- Receive proforma invoice with lead time confirmation within 1 business day.
- Payment via T/T bank transfer or agreed trade terms; dispatch with tracking number provided.
Technical FAQ
Q: Is the SNAT 633 PAC compatible with both ACS 600 and ACS 800?
A: Yes. The module is designed for the shared option slot architecture used across both platforms. Confirm slot availability in your specific drive frame size.
Q: Can I use this module to replace a failed relay output on an existing installation?
A: Yes — it is a direct plug-in replacement. No drive parameter changes are required if replacing a like-for-like unit.
Q: What is the maximum switching frequency for the relay contacts?
A: ABB specifies relay output switching for control-duty cycles (not high-frequency switching). For applications requiring >1 Hz switching, consult ABB application engineering.
Q: Do you provide an ABB factory test certificate?
A: Konmask provides our own inspection report. Original ABB factory certificates are not available for surplus stock. Contact us if your project requires additional documentation.
Q: Can you supply multiple units for a fleet retrofit?
A: Yes. Contact us with your quantity requirement for volume pricing and consolidated shipment options.
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