Product Description
The ABB MM 21 is a robust and reliable motor starter designed for direct-on-line starting of three-phase induction motors. This compact unit integrates overload protection, short-circuit protection, and a main contactor into a single, pre-wired assembly, simplifying installation and reducing wiring time. The MM 21 offers adjustable overload settings to precisely match motor characteristics, ensuring optimal motor protection against overloads and phase failures. It features a high breaking capacity, providing effective protection against short-circuit currents and minimizing potential damage to the motor and electrical system. With its durable construction and dependable performance, the ABB MM 21 is an ideal solution for motor starting applications in various industrial environments, guaranteeing efficient and safe motor operation.
Is Your Device Showing These Signs?
ABB MM 21 modules commonly experience issues such as communication failures on the PROFIBUS DP network, often traced to incorrect addressing or faulty bus termination. Parameter corruption within the module's configuration is a frequent cause of operational errors, necessitating a parameter reset and reconfiguration. I/O signal discrepancies, stemming from wiring faults or sensor malfunctions, require thorough inspection and recalibration. Firmware corruption can lead to unpredictable behavior; a firmware update or re-flash is essential for resolution. Power supply fluctuations or failures impact module stability, demanding a power supply unit check and replacement if needed.
Technical specifications
The ABB MM 21 is a compact, DIN rail mountable, multi-functional power meter designed for accurate measurement and monitoring of electrical parameters in industrial and commercial applications. It provides precise readings of voltage, current, power factor, frequency, active power, reactive power, and apparent power, with Class 0.5S accuracy for active energy measurement. The MM 21 features a bright, backlit LCD display for clear visualization of measured values and supports Modbus RTU communication protocol via RS-485 for seamless integration with energy management systems and SCADA platforms. It is equipped with programmable alarm outputs for critical event notification and offers comprehensive data logging capabilities for detailed energy consumption analysis. The device operates on a wide range of auxiliary power supplies and is certified to meet relevant international standards for safety and electromagnetic compatibility, ensuring reliable and robust performance in demanding environments.
Our Repair Process for the
MM 21
Our repair process begins with a comprehensive diagnostic evaluation to pinpoint the root cause of the module malfunction, focusing on common issues such as PROFIBUS DP communication failures due to addressing or termination problems, parameter corruption requiring a reset and reconfiguration, I/O signal discrepancies necessitating inspection and recalibration, firmware corruption demanding an update or re-flash, and power supply fluctuations or failures requiring a unit check and replacement. Upon identifying the issue, we proceed with the necessary repairs, which include correcting PROFIBUS DP settings, resetting and reconfiguring parameters, addressing wiring faults and recalibrating sensors, updating or re-flashing firmware, or replacing the power supply unit. Post-repair, rigorous testing is conducted to ensure the module operates within specified parameters and to prevent recurrence of the initial problem.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.