Product Description
The Mitsubishi QS90SR2SN-Q, a Melsec-Q series safety relay extension, improves system safety with a 24 V DC power input. It consumes 35 mA (basic) to 110 mA (with three extensions). Its dual-channel safety input and start-up input operate at 24 V DC, consuming 4.6 mA normally and up to 300 mA during relay activation. Output activation/deactivation times are 50 ms/20 ms (max). The three safety outputs support 3.6 A (Category 4) or 5.0 A (Category 3) loads, requiring a minimum 5 V DC/5 mA load. It handles up to 250 V AC or 30 V DC output contacts and operates reliably between 0C and 55C.
Is Your Device Showing These Signs?
The Mitsubishi QS90SR2SN-Q commonly experiences failures related to IGBT module degradation, resulting in overcurrent faults and drive errors. Capacitor bank failures within the power supply section cause voltage instability and operational disruptions. Communication errors arise from faulty encoder feedback, hindering precise motor control. Cooling fan malfunctions lead to overheating and premature component wear. Parameter corruption in the drive's memory necessitates reprogramming for proper functionality.
Technical specifications
The Mitsubishi QS90SR2SN-Q safety relay extension enhances system safety with a 24 V DC power input, consuming 35-110 mA. It features dual-channel safety and start-up inputs (24 V DC, 4.6-300 mA) and output activation/deactivation times of 50 ms/20 ms (max). Its three safety outputs support 3.6 A (Category 4) or 5.0 A (Category 3) loads, requiring a minimum 5 V DC/5 mA load, and handles up to 250 V AC or 30 V DC output contacts within a 0-55C operating temperature.
Our Repair Process for the
QS90SR2SN-Q
Our repair process for the Mitsubishi QS90SR2SN-Q begins with a comprehensive diagnostic evaluation to pinpoint the root cause of the failure, focusing on IGBT module integrity, capacitor bank functionality, encoder feedback accuracy, cooling system performance, and parameter settings. Upon identifying the faulty component(s), we proceed with replacement using only verified, high-quality parts that meet or exceed original manufacturer specifications. Following component replacement, the drive undergoes rigorous testing under simulated operational conditions to ensure stability, performance, and adherence to factory parameters. Finally, the drive is reprogrammed with the correct parameters and subjected to a final quality assurance check before being returned, guaranteeing a fully functional and reliable unit.
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.
Buying Options
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Ships from Rochester, NY