MTL 7756ac Fieldbus Power Conditioner | 20-35V DC, 24V DC, 500mA, IS Power, IP20 Specs

MTL 7756ac Fieldbus Power Conditioner | 20-35V DC, 24V DC, 500mA, IS Power, IP20 Specs

MTL 7756ac fieldbus power conditioner specifications. 20-35V DC input, 24V DC output, 500mA, intrinsic safety, IP20. For FOUNDATION Fieldbus and PROFIBUS PA networks.

Product Overview

The MTL 7756ac​ is a fieldbus power conditioner​ from MTL Instruments, designed to provide power and signal conditioning for FOUNDATION Fieldbus H1 and PROFIBUS PA networks. This unit accepts 20-35V DC input, delivers a stabilized 24V DC output​ with 500mA capacity, and provides intrinsic safety (IS) power​ for field instruments. The "7756ac" designation identifies this specific model in MTL's 7700 series of fieldbus products. This device enables reliable communication and power delivery to field instruments in hazardous and industrial areas, featuring advanced diagnostics and network protection.

Technical Specifications

Note: Specifications are based on MTL 7756 series technical documentation. The "7756ac" model includes specific approvals and features for fieldbus applications. Actual performance may vary with network configuration and field conditions.

Model Number Decoding (7756ac)

• 7756:​ Base model (fieldbus power conditioner)

• a:​ Approval variant (specific hazardous area certifications)

• c:​ Configuration/feature set (typically indicates specific diagnostic capabilities)

Note:​ The "7756" indicates the core product - a fieldbus power conditioner. The suffixes "ac" denote specific approval markings and feature sets for hazardous area installation. Different suffix combinations indicate different agency approvals and optional features.

Key Features

• Active Power Conditioning:​ Maintains signal integrity and provides impedance matching

• 500mA Segment Power:​ Supports multiple field instruments on a single segment

• Built-in Termination:​ Switchable 100Ω termination resistor

• Advanced Diagnostics:​ LED indicators for power, segment health, and fault conditions

• Galvanic Isolation:​ 500V isolation between host and field sides

• Short Circuit Protection:​ Current limiting with automatic recovery

• Wide Input Range:​ 20-35V DC input for flexible power supply compatibility

• DIN Rail Mounting:​ Easy installation in control panels

• Global Certifications:​ Approved for use in hazardous areas worldwide

• Signal Enhancement:​ Improves signal quality for longer network segments

Fieldbus Network Specifications

Typical Applications

• Process Industries:​ Oil & gas, chemical, petrochemical plants

• Power Generation:​ Boiler control, turbine monitoring

• Pharmaceutical:​ Process control in hazardous areas

• Water Treatment:​ Monitoring and control in classified areas

• Mining:​ Instrument networks in underground applications

• Marine:​ Offshore platform instrumentation

• Any FOUNDATION Fieldbus H1 or PROFIBUS PA network​ requiring power conditioning and hazardous area protection

Important Technical Notes

1. Hazardous Area Approvals:​ The 7756ac carries specific ATEX/IECEx/FM/CSA approvals. Verify that the unit's certifications match the hazardous area classification of your installation site.

2. Power Supply:​ Requires a separate 20-35V DC power source. The power supply must be rated for the total current consumption of all devices on the fieldbus segment.

3. Network Design:​ Proper fieldbus network design is essential. Calculate the voltage drop and power requirements for all field devices. Maximum segment length depends on cable type, number of devices, and power consumption.

4. Termination:​ Ensure proper termination at both ends of the fieldbus segment. The 7756ac provides one termination - the other end should be terminated at the last device or with a separate terminator.

5. Grounding:​ Follow manufacturer's grounding recommendations. Typically, the fieldbus shield should be grounded at one point only (usually at the power conditioner).

6. Diagnostic LEDs:​ Monitor LED status for troubleshooting:

   • Power (Green):​ Input power present

   • Segment OK (Green):​ Fieldbus communication active

   • Segment Fault (Red):​ Short circuit, overload, or communication fault

7. Installation:​ Install in appropriate enclosure. IP20 provides limited protection against dust and moisture.

Note: For complete installation guidelines, wiring diagrams, network design procedures, and detailed certification information, consult the official MTL 7756 Series Technical Manual. Always verify the specific model's approvals match your hazardous area requirements.