Configured for multi-channel analog signal routing and slave termination module interconnectivity in Bailey Infi 90 DCS racks, the ABB NKAS11-12 (NKAS11 Analog Slave Termination Unit Cable) provides direct physical/electrical execution. This multi-conductor cable assembly transfers low-level voltage and current loop signals between analog slave processing cards and field termination units, supporting continuous 300 V AC insulation integrity across 16-32 conductor pathways.

Cable Part Number & Assembly Breakdown

• NKAS11: Base part designation for Bailey Infi 90 analog slave termination interconnect cables.
• -12: Extended assembly length designator (12 ft nominal length specification / 12 in physical harness span).
• Conductor Harness: Multi-conductor bundle incorporating 16-32 discrete 20-22 AWG copper lines rated for 300 V AC service.

Technical & Electrical Specifications

Deterministic IO Bus Routing & Signal Integrity

The NKAS11-12 assembly supports structured backplane bus communication velocity and I/O density scaling across Infi 90 analog expansion racks. Low-resistance 20-22 AWG copper conductors limit loop impedance and prevent channel crosstalk during multi-channel signal multiplexing. The assembly preserves precise analog-to-digital measurement accuracy and maintains firmware flash compatibility across connected slave modules during continuous online operations.

Package & Ordering Components

• 1 x ABB NKAS11-12 Analog Slave Termination Unit Cable
• Factory ESD protective polybag packaging

Cabinet Cable Installation Guidelines

• Connector Engagement: Insert terminal connectors fully into mating module headers and tighten retaining screws to establish low-resistance electrical contacts.
• Bend Radius Limits: Maintain a minimum static cable bend radius of 75 mm inside wireways to prevent conductor stress and insulation degradation.
• Signal Cable Separation: Route the analog slave cable bundle at least 200 mm clear of AC power wiring and high-current relay circuits to mitigate noise coupling.
• Strain Relief: Secure the cable harness to cabinet tie-down points within 100 mm of the connection header to eliminate mechanical pull on terminal pins.

Technical Support FAQ

• What is the primary application of the NKAS11-12 cable assembly?

  It provides multi-channel analog signal connections between slave processing modules and field termination blocks in Infi 90 racks.

• What voltage isolation rating applies to the individual conductors?

  Each conductor in the assembly features high-dielectric insulation rated for continuous operation at 300 V AC.

• Can the cable assembly be disconnected while the host module is powered?

  Disconnecting live cables breaks analog loops, triggering open-circuit diagnostic alarms on active controller channels.

• How does conductor resistance affect measurement accuracy across this cable?

  The 20-22 AWG wire gauge minimizes series loop resistance, preserving voltage drops and 4-20 mA calibration limits.

• Does the NKAS11-12 require separate external shield grounding wires?

  Internal cable shields connect automatically to system chassis earth through dedicated ground pins on the header connector.

• What is the ambient temperature threshold for installed cable runs?

  The physical cable assembly operates continuously in ambient field temperatures from -20 deg C up to +80 deg C.

• How does the cable construction prevent internal signal crosstalk?

  Conductors are arranged in twisted pairs with overall shielding to isolate adjacent analog channels from mutual induction.

• How should spare cable harness length be stored within marshalling racks?

  Coil excess cable in loose loops with a minimum diameter of 200 mm to preserve conductor insulation and shielding integrity.