1. Product Overview
Product Name: G5 Digital 240V AC Output Module
Model Number: 70G-OAC5A
Series: G5 Series Solid-State I/O Modules
Article Number: 70G-OAC5A
Manufacturer: Grayhill, Inc.

The Grayhill 70G-OAC5A is a G5 Series digital output module designed for industrial control and automation systems requiring reliable switching of AC loads. It is a solid-state output module that provides 240V AC output capability with zero-voltage turn-on functionality, ensuring smooth and efficient switching with minimal electrical noise. The module is part of Grayhill’s G5 family of digital I/O modules, known for their compact form factor, high reliability, and compatibility with a wide range of backplanes and interface boards used in programmable logic controllers (PLCs), distributed control systems (DCS), and custom automation equipment.

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2. Key Features
- Solid-State AC Output: Utilizes semiconductor switching technology instead of mechanical relays, offering long operational life, silent operation, and resistance to vibration and shock.
- Zero-Voltage Turn-On: The output switches on only when the AC load voltage crosses zero, minimizing electrical transients, reducing electromagnetic interference (EMI), and extending the life of connected loads.
- High Voltage Capability: Rated for 240V AC output, suitable for controlling industrial-grade AC devices such as solenoids, contactors, lamps, and small motors.
- Optical Isolation: Provides galvanic isolation between the control logic and the AC load circuit, protecting sensitive control electronics from voltage spikes and surges.
- Compact G5 Form Factor: Standardized G5 module footprint allows easy integration into existing Grayhill or compatible I/O racks and sockets.
- LED Status Indicator: Integrated LED provides visual feedback of output status, simplifying troubleshooting and system diagnostics.
- Low Power Control Input: Designed for TTL or logic-level control signals, typically 5V DC, ensuring compatibility with microcontrollers, PLC outputs, and digital control systems.
- High Reliability: No moving parts, low heat generation, and robust solid-state design ensure long-term reliability in demanding industrial environments.
- Plug-In Module Design: Facilitates quick replacement and maintenance without rewiring or system downtime.

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3. Technical Specifications
- Manufacturer: Grayhill, Inc.
- Series: G5 Digital I/O Modules
- Model Number: 70G-OAC5A
- Function: Digital AC Output Module
- Output Type: Solid-State (Triac-based)
- Output Voltage Range: 12–240V AC
- Maximum Load Current: Typically 3A at 240V AC (depending on ambient temperature and heat dissipation)
- Control (Input) Voltage: 5V DC nominal (TTL compatible)
- Control Current: Approximately 15–20 mA typical
- Turn-On Type: Zero-Voltage Switching
- Isolation Voltage: 4000 Vrms (input-to-output isolation)
- Leakage Current (Off-State): <2 mA typical at rated voltage
- On-State Voltage Drop: <1.6V AC RMS typical at full load
- Switching Frequency: Up to 10 Hz (AC zero-cross limited)
- Operating Temperature Range: -30°C to +80°C
- Storage Temperature Range: -40°C to +100°C
- Housing Material: Molded thermoplastic, flame-retardant (UL 94V-0 rated)
- Dimensions: Approx. 25.4 mm (1.0 in) wide × 38.1 mm (1.5 in) high × 76.2 mm (3.0 in) deep (standard G5 module size)
- Weight: Approximately 45–60 grams (depending on configuration)
- Mounting Type: Plug-in module for G5 sockets or backplanes
- Color: Gray housing with printed identification label
- Status Indicator: Red or green LED (output ON indication)

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4. Functionality
The Grayhill 70G-OAC5A operates as a digital AC output interface between low-voltage control logic and high-voltage AC loads. When a logic-level control signal (typically 5V DC) is applied to the input terminals, the internal optically isolated driver circuit activates a triac output stage. The triac conducts current to the connected AC load only when the AC waveform crosses zero volts, ensuring minimal electrical noise and reduced stress on both the module and the load.

Typical Use Cases and Applications:
- Industrial automation systems controlling AC actuators, solenoids, and contactors
- PLC output expansion modules for AC load control
- Building automation systems for lighting and HVAC control
- Machine control panels requiring silent, maintenance-free switching
- Test and measurement systems needing isolated AC switching
- Process control systems with mixed AC/DC load requirements

Compatibility:
The 70G-OAC5A is compatible with standard Grayhill G5 sockets, backplanes, and interface boards. It can also be used with third-party I/O racks designed for G5-style modules. The control input is TTL/logic compatible, allowing direct interfacing with microcontrollers, PLC digital outputs, or computer-based control systems.

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5. Components & Accessories
Included Items:
- One (1) Grayhill 70G-OAC5A G5 Digital 240V AC Output Module
- Integrated LED status indicator
- Factory-applied identification label with model and electrical ratings

Optional Accessories:
- G5 Series Mounting Socket: For panel or DIN-rail installation (e.g., Grayhill 70G-SKT or equivalent)
- Backplane Assemblies: Multi-channel I/O racks for modular system integration
- Protective Covers: Transparent covers for dust and debris protection
- Heat Sinks: Optional external heat sinks for high-current or high-temperature applications
- Interface Cables: For connection between control logic and module sockets

Connectors:
- Input Side: Two control pins (logic input and common)
- Output Side: Two load terminals (AC load connection)
- Socket Interface: Standard 4-pin G5 module pin configuration

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6. Installation & Setup
Requirements:
- Compatible G5 socket or backplane
- Proper ventilation to dissipate heat generated during operation
- Load current and voltage within rated specifications
- Control signal within specified input voltage range

Mounting Options:
- Plug directly into a G5 socket mounted on a DIN rail or panel
- Secure with retaining clips or socket latches to prevent vibration-induced disconnection

Configuration Steps:
1. Ensure power is disconnected before installation.
2. Insert the module into the corresponding G5 socket, aligning pins correctly.
3. Connect the AC load to the output terminals of the socket.
4. Connect the control signal (5V DC logic) to the input terminals.
5. Verify wiring and ensure proper grounding.
6. Apply control voltage and observe LED indicator for output status.

Safety Considerations:
- Always observe proper isolation between control and load circuits.
- Do not exceed rated voltage or current limits.
- Use appropriate fusing or circuit protection on the load side.
- Ensure compliance with local electrical codes and safety standards.

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7. Performance & Capabilities
The 70G-OAC5A delivers consistent and reliable AC switching performance for industrial and commercial applications. Its zero-voltage turn-on feature ensures minimal inrush current and reduced electrical noise, making it ideal for sensitive environments. The solid-state design eliminates mechanical wear, providing millions of switching cycles without degradation.

Performance Highlights:
- Switching Speed: Fast response suitable for most AC control applications (limited by AC zero-cross timing).
- Load Capacity: Up to 3A continuous at 240V AC, depending on ambient temperature and cooling.
- Efficiency: Low on-state voltage drop minimizes power dissipation.
- Thermal Management: Designed for natural convection cooling; optional heat sinks can extend current capacity.
- Reliability: MTBF (Mean Time Between Failures) typically exceeds 1 million hours under nominal conditions.
- Limitations: Not suitable for DC loads (triac-based output requires AC zero-crossing). For DC switching, use Grayhill DC output modules (e.g., 70G-ODC5A).

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8. Standards & Compliance
The Grayhill 70G-OAC5A meets or exceeds industry standards for safety, performance, and electromagnetic compatibility.

Certifications and Compliance:
- UL Recognized Component (UL File E52744 or equivalent)
- CSA Certified for use in Canada and the United States
- CE Marked for compliance with European Union directives
- RoHS Compliant (Restriction of Hazardous Substances)
- EN/IEC 60950-1 and EN/IEC 61010-1 safety standards for control equipment
- EMC Compliance: Meets applicable EN 55022/55024 standards for electromagnetic emissions and immunity

Industry Standards:
- Compatible with ISA and IEC modular I/O interface standards
- Designed for use in industrial control panels per UL 508A guidelines

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9. Additional Information
Warranty:
Grayhill provides a limited manufacturer’s warranty (typically one year from date of purchase) covering defects in materials and workmanship under normal operating conditions.

Support:
Technical documentation, datasheets, and application notes are available from Grayhill’s official website. Engineering support and product selection assistance are provided through authorized distributors and Grayhill’s technical support team.

Maintenance:
The 70G-OAC5A requires no routine maintenance due to its solid-state design. Periodic inspection of socket connections and load wiring is recommended to ensure reliable operation.

Firmware/Software Updates:
As a hardware-only module, the 70G-OAC5A does not require firmware updates. However, Grayhill periodically updates datasheets and application guidelines to reflect new standards or performance improvements.

Service Life and Replacement:
With proper installation and operation within rated limits, the module can operate for many years without failure. Replacement is straightforward—simply unplug the old module and insert a new one into the same socket.

Environmental Considerations:
- Designed for industrial environments with moderate humidity and temperature variations.
- Avoid exposure to corrosive gases, excessive dust, or direct moisture.
- Dispose of in accordance with local electronic waste regulations (RoHS compliant materials).

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Summary
The Grayhill 70G-OAC5A G5 Digital 240V AC Output Module is a robust, high-performance solid-state output device engineered for industrial automation and control systems. Featuring zero-voltage turn-on, optical isolation, and solid-state reliability, it provides safe, efficient, and noise-free switching of AC loads up to 240V. Its standardized G5 form factor ensures compatibility with a wide range of sockets and backplanes, while its LED status indicator simplifies diagnostics. Designed to meet stringent industrial standards and backed by Grayhill’s reputation for quality, the 70G-OAC5A is an ideal choice for engineers and system integrators seeking dependable AC output control in compact modular form.