The Yudian AI‑508 is an economical AI (Artificial Intelligence) PID temperature regulator designed for single‑loop control in industrial heating applications. It combines a universal input stage—accepting 6 thermocouple types and Pt100 RTD—with a modular output architecture that supports relay, SSR voltage, TRIAC, and thyristor trigger outputs. The integrated AI control algorithm provides one‑key auto‑tuning and automatic over‑shoot prevention, making it suitable for equipment manufacturers and plant maintenance teams who need reliable temperature control without manual PID tuning expertise. Seven standard DIN panel sizes allow the AI‑508 to fit virtually any control cabinet cut‑out within a single product series.

AI Self‑Tuning and Over‑Shoot Prevention

• One‑Key Auto‑Tuning (AT): The user simply presses the AT key on the front panel. The controller alternates heating and cooling cycles, measures the thermal response of the connected load, and automatically calculates the optimal PID constants. No manual entry of PID parameters is required. The AI algorithm continuously refines the control parameters during operation, allowing the same controller to work effectively across a wide range of thermal loads—from small laboratory ovens to large industrial furnaces.
• AI PID Control vs. Standard PID: Conventional PID controllers typically produce a 1–2 °C overshoot during startup and after large setpoint changes. The AI‑508's artificial intelligence algorithm predicts the trajectory of the temperature rise and begins reducing the output before the setpoint is reached, achieving controlled heat‑up with negligible or zero overshoot. This over‑shoot prevention function is built into the control algorithm and requires no additional user configuration—it is always active when AI PID control mode (CtrL=APID) is selected.
• Adjustable Control Cycle: The control output cycle can be configured between 0.5 s and 120 s. Short cycles (0.5–2 s) are suitable for SSR‑driven fast‑response heating, while longer cycles (20–120 s) are used for mechanical relay outputs or slow‑response thermal systems to extend contact life.

Modular Output Architecture

• Field‑Replaceable Output Modules: The AI‑508 uses a plug‑in modular design for its outputs. Users can select from relay (L1/L2/L4: 2 A/250 VAC), SSR voltage drive (G: 12 VDC/30 mA), TRIAC contactless switch (W1), single‑phase thyristor zero‑crossing trigger (K1), or three‑phase thyristor trigger (K3: 5 ~ 500 A) modules. The modules can be replaced or upgraded in the field without returning the entire controller to the manufacturer, reducing downtime and spare parts inventory.
• Three Independent Module Slots: The controller has three module positions: OUTP (main control output), ALM (alarm output), and AUX (auxiliary output). Each can be populated with the appropriate module for the application. The same base controller can be configured as a simple relay ON/OFF controller, a high‑speed SSR PID controller, or a three‑phase SCR power controller for loads up to 500 A.
• Alarm Functions: High limit, low limit, and deviation alarm modes are available. Up to two alarm outputs (AL1 and AL2) can be independently configured. When a sensor break is detected, the output automatically stops and the upper display flashes "orAL" alternately with the high or low limit, providing unambiguous fault indication.

Supply Voltage, Panel Sizes, and Environmental Specifications

• Wide‑Range Power Supply: The AI‑508 operates from any supply voltage between 100 V AC and 240 V AC at 50/60 Hz. An optional 24 V DC supply variant is available. Power consumption is 3 W or less—among the lowest in its class—which reduces heat accumulation inside densely packed control cabinets and saves energy in continuously operating installations.
• Seven Standard DIN Panel Sizes: Available in A (96×96 mm), B (160×80 mm), C (80×160 mm), D (72×72 mm), D2 (48×48 mm), E (48×96 mm), and F (96×48 mm). Panel depth is ≤100 mm, allowing installation in shallow control cabinets. Optional IP66 front protection is available with a rubber gasket for washdown environments.
• Operating Environment: Rated for continuous operation from −10 °C to +60 °C with ≤90% relative humidity (non‑condensing). The controller meets EMC immunity requirements of IEC61000‑4‑4 (±4 KV/5 KHz) and IEC61000‑4‑5 (4 KV). CE, UL, and RoHS certifications are standard.

Applications

• Plastics machinery: extruder barrel temperature control, injection molding hot runner control
• Food processing: baking ovens, fryers, pasteurization equipment
• Packaging machinery: heat sealing, shrink‑wrap tunnels, blister forming
• Environmental test equipment: temperature chambers, incubators, drying ovens
• Chemical reactors: heating jacket temperature control with SSR or thyristor output
• General industrial heating applications requiring precise, maintenance‑friendly temperature control across 7 panel sizes