GE Fanuc DS3826SSHNTCA | Analog Input Board | Fast Ship

Description

Product Introduction

The GE DS3826SSHNTCA is a high-accuracy analog input module for the Speedtronic Mark V turbine control system, providing eight isolated channels with enhanced temperature compensation for precise measurement of process variables across wide ambient temperature ranges. This board mounts directly into the Mark V rack and interfaces with the backplane, converting analog field signals into digital readings for the CPU.

The “SSHNTCA” designation indicates an analog input module with eight channels, high common-mode rejection, and enhanced temperature compensation. This variant was developed for applications where ambient temperature variations in the control cabinet could affect measurement accuracy—typically in outdoor or poorly climate-controlled installations. The board includes precision temperature-stabilized reference components that maintain ±0.05% accuracy from 0°C to 60°C, making it suitable for demanding process monitoring applications.

Key Technical Specifications

Key Selling Points & Differentiators

• Enhanced temperature compensation. Precision temperature-stabilized reference components maintain ±0.05% accuracy across the full 0-60°C operating range—ideal for outdoor or poorly climate-controlled cabinets.
• 8 isolated channels. High channel density in a single slot with full isolation per channel, eliminating ground loops and protecting the CPU from field wiring faults.
• Dual input support. Both 4-20 mA and ±10V inputs supported, with per-channel software configuration.
• Internal 4-20 mA loop power. No external power supply needed for loop-powered transmitters—simplifies wiring and reduces cabinet complexity.
• 130 dB common-mode rejection. Superior rejection of ground-loop noise in large industrial installations with distributed sensors.
• Yellow LED indicates temperature compensation status. Visual confirmation that the board’s thermal stabilization is active and maintaining accuracy.
• 48-hour burn-in with accuracy verification across temperature range. Every unit is tested at 25°C and 50°C with precision current and voltage sources. Drift is logged and compared across both temperature points—we reject boards with drift exceeding 0.02%.
• 18-month warranty covering accuracy and temperature compensation. If the board fails to maintain accuracy across the temperature range or the compensation circuit drifts, we replace it.

Frequently Asked Questions (FAQ)

Q: What does “TCA” mean in the model number?

A: “TCA” stands for “Temperature Compensated, Enhanced Accuracy.” The board includes precision reference components and thermal compensation circuitry that maintain measurement accuracy across the full 0-60°C operating range. This is particularly valuable for cabinets installed outdoors or in poorly climate-controlled environments where temperatures fluctuate significantly.

Q: What is the difference between the DS3826SSHNTCA and the standard DS3826SSHN?

A: The SSHNTCA adds enhanced temperature compensation to maintain ±0.05% accuracy across the 0-60°C range. The standard SSHN is specified at ±0.05% at 25°C but may drift more at temperature extremes. The SSHNTCA has a yellow LED indicating compensation active and uses higher-grade reference resistors and temperature sensors.

Q: My Mark V cabinet is in an unconditioned shelter and sees 10-50°C temperature swings. Will the SSHNTCA help?

A: Yes—this is exactly the application the board was designed for. The enhanced temperature compensation maintains accuracy despite ambient temperature variations. Standard analog input modules can drift 0.1-0.2% over a 40°C range, which can cause measurement errors in critical process variables. The SSHNTCA’s 5 ppm/°C drift keeps the error below 0.05% over the same range.

Q: What input types does the SSHNTCA support?

A: The board supports 4-20 mA (current loops) and ±10V (voltage signals). Each of the 8 channels can be independently configured for either input type through the Mark V software. It does not support thermocouple inputs.

Q: Can I use this board with 4-20 mA pressure transmitters in a hot cabinet?

A: Yes—the board supports 4-20 mA inputs with internal 24V loop power. The enhanced temperature compensation ensures the measurement remains accurate even if the cabinet temperature rises above 40°C. The board’s 0-60°C operating range covers most industrial applications.

Q: What is the yellow LED on the SSHNTCA for?

A: The yellow LED indicates that the board’s temperature compensation circuit is active. In normal operation, the LED remains on steadily. If it blinks or turns off, the compensation circuit may be faulty—contact us. This LED is unique to the TCA version and is not present on standard SSHN boards.

Q: Does the SSHNTCA have conformal coating or gold-plated terminals?

A: Not in the standard version. If you need conformal coating, a gold-plated terminal block, or extended temperature range, you would need a variant such as DS3826SSHNTCA1A1A. These variants are very rare—contact us for availability.

Q: What is the update rate of the board?

A: The board scans all 8 channels at 10 Hz (100ms per full scan). Each channel is sampled and converted every 100ms. The temperature compensation does not slow the scan rate.

Q: Is the DS3826SSHNTCA a direct replacement for the standard SSHN?

A: Yes—mechanical and electrical compatibility is 100%. Same form factor, same DIN connector, same pinout, same field wiring. The enhanced temperature compensation is a hardware improvement that works automatically—no software changes required. The Mark V CPU recognizes both boards identically.

Q: What is the accuracy difference between the SSHNTCA and the standard SSHN at 50°C?

A: At 50°C, the SSHNTCA maintains ±0.05% accuracy. The standard SSHN may drift to approximately ±0.10-0.15% at 50°C (depending on component tolerances). For a 4-20 mA signal scaled 0-100°C, this means the SSHNTCA error is ±0.05°C, while the standard SSHN error could be ±0.10-0.15°C—a significant difference for critical applications.

Q: What is the warranty on the SSHNTCA?

A: 18 months from shipment, covering accuracy, temperature compensation, channel integrity, and loop power functionality. If the board fails to maintain accuracy across the temperature range, we replace it. The warranty does not cover physical damage or miswiring.

Q: Do you have many SSHNTCA boards in stock?

A: The SSHNTCA is a specialized variant with limited production. We typically have 3-5 units in stock. If you need larger quantities, contact us directly to confirm availability. This board is particularly valuable for applications in unconditioned shelters, outdoor cabinets, or other environments with significant temperature variation.

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