761CNA-AT Foxboro Process Controller

Foxboro 761CNA-AT 760 Series Single Station Controller

Foxboro 761CNA-AT 760 Series Single Station Controller

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Foxboro 761CNA-AT Single Station Micro Plus Controller Configured for dynamic compensation and assignable process alarms in DCS and advanced single-loop...

رمز المنتج: 761 CNA-AT

Manufacturer: Foxboro
Product No.: 761 CNA-AT
Product Type: Single Station Controllers
Product Origin: USA
Payment:T/T, Western Union
Weight: 3600g
Shipping port: Xiamen
Warranty: 12 months

وصف التقييمات

Foxboro 761CNA-AT Single Station Micro Plus Controller

Configured for dynamic compensation and assignable process alarms in DCS and advanced single-loop applications, the Foxboro 761CNA-AT (761CNA Single Station Micro Plus Controller) provides direct physical/electrical execution across continuous process control networks. The controller processes standard field analog signals and executes full proportional, integral, and derivative (PID) algorithms via an integrated front panel keypad. Designed with a 32-position terminal block, nonvolatile memory backup, and modular retrofitting capability, the hardware maintains deterministic loop execution through sudden main supply interruptions.

Hardware Specifications

Parameter	Specification
Model	761CNA-AT
Brand	Foxboro
Origin	USA
Weight	3.6 kg (8.6 lbs)
Dimensions	17.8 cm x 7.6 cm x 50.8 cm (7.0 in x 3.0 in x 20.0 in)
Operating Temp	-40 deg C to +85 deg C
Power Supply	120 VAC, 50/60 Hz
Power Consumption	Standard internal power transformer load
Product Type	Single Station Micro Plus Controller
Input Signal	4-20 mA DC
Accuracy	+/-0.25% of span typical
Response Time	2 s or less
Control Modes	Proportional, Reset (Integral), Derivative, PID
Proportional Band	Adjustable 4% to 400%
Reset (Integral)	Adjustable 0.01 to 50 min/repeat
Derivative	Adjustable 0.05 to 50 min
Wiring Termination	32-position terminal block
Enclosure Rating	NEMA 3 / IP53
Mounting	Shelf-mount or retrofit into standard Foxboro shelves

Process Control & 4-20 mA Loop Architecture

The unit integrates standard 4-20 mA DC analog current loop processing with internal cold-junction compensation pathways and isolated signal conditioning stages. Channel-to-channel isolation hardware mitigates ground-loop noise across industrial sensor installations, maintaining signal accuracy within +/-0.25% of span. The internal firmware continuously samples incoming 4-20 mA process variables (PV), updates internal setpoint calculations, and drives physical control elements without latency degrade. Nonvolatile memory registers store custom control logic and user parameters without requiring battery backup, ensuring deterministic startup and state recovery following a total 120 VAC power interruption.

Frequently Asked Questions

Q: How does the controller retain configuration parameters during a sudden AC power loss?

A: The module relies on integrated nonvolatile memory to maintain logic control routines, tuning values, and alarm parameters. When 120 VAC main power restores, the hardware boots directly into operational state without parameter loss or recalibration requirements.

Q: What mounting configurations are supported for retrofitting older installations?

A: The chassis uses a standardized shelf-mount enclosure designed for direct insertion into existing Foxboro 760 Series panel shelves, connecting to field loops via the rear 32-position terminal block.

Field Installation Guidelines

Power Supply Integrity: Confirm main power source delivers steady 120 VAC, 50/60 Hz power prior to energizing the module terminal blocks.
Shielding and Grounding: Terminate 4-20 mA signal cable shielding at a single system earth point to prevent circulating ground currents from corrupting analog inputs.
Wiring Conductors: Strip field signal wires to recommended lengths and secure firm physical contact inside the 32-position terminal block, avoiding loose wire strands near adjacent terminals.
Thermal Management: Maintain adequate vertical and horizontal clearance inside the instrument enclosure to prevent thermal buildup past the upper operating limit of +85 deg C.
Enclosure Protection: Verify panel cutouts and rack seals meet NEMA 3 / IP53 standards when operating in environments exposed to ambient dust or condensation.

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