B&R X20CM0985 X20 System 3-Phase Energy Measurement Module

Product Overview

The X20CM0985 (X20CM0985) is a sophisticated 3-channel analog input module designed for comprehensive power and energy measurement within the B&R X20 System. This module is engineered to monitor 3-phase electrical networks, supporting direct voltage inputs of up to 480 VAC and current inputs of 1 A or 5 A AC via external transformers. In energy-intensive industries such as plastics processing, metal fabrication, and large-scale manufacturing, the X20CM0985 provides the critical data required for load management, predictive maintenance, and energy efficiency auditing. By delivering high-precision measurements of active, reactive, and apparent power directly to the PLC, it enables engineers to optimize machine performance and reduce operational overhead through real-time grid analysis.

Technical Configuration

The X20CM0985 integrates complex signal processing within the standard X20 form factor. It features three independent channels for simultaneous current and voltage measurement, allowing for the calculation of phase angles and harmonic distortion. The internal hardware is robust, consuming 1.05 W from the X20 bus and 4 W for the internal I/O circuitry. It is designed for high-voltage environments with a rated input capacity of 120 VAC to 480 VAC, making it compatible with most global industrial power grids. The module utilizes specialized A/D converters to handle the AC waveforms, ensuring that peak values and RMS calculations are performed with minimal latency. With an IP 20 protection rating, it is intended for installation in controlled electrical cabinets where space-saving and modularity are prioritized.

Technical Specifications

Technical FAQs

Can the X20CM0985 measure power in both 3-phase and single-phase systems?

Yes, the module is designed for 3-phase systems but can be configured to monitor three individual single-phase circuits. This flexibility allows for the monitoring of multiple high-load single-phase actuators within a single machine using only one module.

Does this module require external current transformers (CTs)?

Yes, for current measurement, the X20CM0985 must be interfaced with external current transformers that provide a secondary output of either 1 A or 5 A AC. Direct connection of high-current power lines to the module will result in immediate hardware failure.

What specific electrical parameters can be calculated by the X20CM0985?

Beyond standard voltage and current, the module provides data for active power (W), reactive power (var), apparent power (VA), energy consumption (Wh), and power factor (cos phi). It also supports frequency measurement and basic harmonic analysis.

Engineering & Installation Guide

• Current Transformer Polarity: When wiring the 1 A or 5 A current inputs, strict adherence to the S1 (k) and S2 (l) polarity is essential. Reversing the polarity on a single phase will result in incorrect power factor readings and negative energy calculations for that specific phase.

• Voltage Path Protection: Always install 3-pole circuit breakers or fuses (typically rated at 1 A to 2 A) in the voltage measurement path between the power line and the X20CM0985. This protects the module and the X20 backplane from catastrophic failure in the event of a line-to-line short circuit within the measurement loop.

• Shielding and Grounding: Given the proximity to high-voltage lines, the X20CM0985 is susceptible to electromagnetic interference. Ensure the X20 bus module is properly snapped onto a grounded DIN rail. Use shielded cables for the current transformer secondaries and ground the shield at a single point to prevent circulating ground currents from skewing measurement accuracy.