Schneider Electric (Barber Colman) AM-703 Span Adjustment Module

The Schneider Electric (Barber Colman) AM-703 Span Adjustment Module is a precision input rescaling module designed for field technicians and system integrators who need to bridge the gap between non-standard control signals and standard 2 to 10 Vdc HVAC actuators. This SmartX damper actuator accessory is essential for legacy retrofits or custom control sequences where a secondary signal source or non-linear sensor requires normalization. It allows for a zero offset adjustment from 0 to 18 Vdc and features a comprehensive span range adjustment of 2.6 to 17 Vdc, making it highly versatile for managing 4 to 20 mA loops (when used with a 500-ohm resistor) or other varied voltage inputs.

Built for the rigors of commercial mechanical rooms, the AM-703 operates on a 24 Vac/Vdc power supply and utilizes a standard snap track mounting system for rapid installation within control cabinets. The module is particularly effective for actuator sequencing, where multiple modules can be adjusted to trigger different mechanical responses from a single master control signal. With its 14-gauge max wire terminals and compact footprint, this proportional control module ensures reliable standardized signal output without the need for complex controller reprogramming.

• Universal Signal Conditioning: Expertly converts varied analog inputs into a clean 2 to 10 Vdc signal to maintain linear actuator response.
• Precision Calibration: Features independent offset and span potentiometers for fine-tuning signal thresholds in the field.
• Sequential Control Capability: Allows for actuator staging by setting multiple modules to operate at specific, non-overlapping input ranges.
• Broad Compatibility: Seamlessly integrates with Schneider Electric SmartX series and legacy Barber Colman proportional systems.
• Rugged Design: Rated for operation in environments from -20 to 150°F, ensuring stability in demanding plenum or equipment room conditions.

How do I calibrate the AM-703 for a 4 to 20 mA input?

To process a 4 to 20 mA signal, you must install a 500-ohm resistor (such as the AM-708) across the input terminals to convert the current to a 2 to 10 Vdc base signal, then use the onboard potentiometers to trim the zero and span for your specific actuator travel.

Can this module be used to sequence multiple dampers?

Yes. By wiring multiple AM-703 modules to a single controller output, you can calibrate each module’s zero and span so that Dampers A, B, and C open at different voltage intervals (e.g., 2-5V, 5-8V, and 8-11V).

What is the maximum current load for the 2-10 Vdc output?

The AM-703 provides a maximum output current of 15 mA, which is sufficient to drive the high-impedance inputs of multiple modern electronic proportional actuators.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.