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The Danfoss troubleshooting guide for supermarket electronics provides comprehensive support for maintaining and optimizing various Danfoss control systems commonly found in supermarket environments. This guide is designed for users who need to diagnose and resolve issues with refrigeration, climate control, and other electronic systems, ensuring efficient operation and minimizing downtime.
The Danfoss troubleshooting guide covers a range of controllers and modules, including the AK-SM 800A, AK-SM 800, AK-CC 550A, AK-CC 750, AK-XM Modules, Storeview, AK-SC 255, AKC 55, AKC 164, and AKA 65. Each section is dedicated to specific issues that may arise with these devices, offering step-by-step instructions for diagnosis and resolution.
For the AK-SM 800A and AK-SM 800, the guide addresses common problems such as compressors not engaging due to high suction, I/O modules going offline, "Mismatch" issues with case controllers, and the system getting stuck on "Verifying Nodes." It also covers issues like unresponsive keypads, database loading failures via USB, missing licenses, host communication errors, system slowness, and DNS failure alarms. The troubleshooting steps often involve checking power supply, verifying network configurations (e.g., Channel Lonworks/Modbus settings, term resistor positions, EOL resistors), inspecting wiring for shorts, and ensuring correct addressing and firmware versions. For compressor issues, users are guided to check rack status screens for warnings (phase loss, high discharge pressure, oil fail), verify staging patterns, and confirm relay addresses.
The AK-CC 550A section focuses on problems like AKV valves not opening, incorrect superheat readings, and specific error codes such as Pe Error (E20) and S3 Error (E25). It provides detailed checks for voltage at terminals, sensor accuracy (coil outlet sensor, pressure transducer), and transducer wiring. For offline AK-CC 550A case controllers, the guide suggests rescanning, verifying Modbus/Lon loop configurations, checking EOL resistors, and ensuring unique addresses. It also addresses mismatch errors during firmware installation and configuration for dual temp setups.
For the AK-CC 750, the guide outlines the replacement process, including setting the address, performing a rescan, and configuring evaporators.
AK-XM Modules troubleshooting covers issues with AKS temp sensors not reading, modules not coming online, relays not responding to program overrides, fluctuating sensor readings, and intermittent I/O offline issues. Solutions involve verifying sensor wiring, checking board/point status, ohm testing sensors, and ensuring proper power and grounding for the modules.
The Storeview section addresses connectivity problems, specifically when unable to connect to a site that works in a web browser, suggesting deleting and re-adding the site.
For the AK-SC 255, common issues include battery replacement/low battery alarms, alarm dialout problems, "Press 9 to Clear Database" messages, and persistent "Alarm" flashing with a red LED despite no active alarms. The guide provides instructions for battery replacement, modem checks, verifying alarm routing, and clearing databases or alarm logs. I/O offline issues for the AK-SC 255 are similar to other modules, involving power verification, network node settings, EOL resistor checks, and loop isolation. Missing license issues for the AK-SC 255 are also covered, with advice to contact Danfoss Tech Support or load a backup database. Display screen problems (black or white) are addressed by checking ribbon cable connections.
The AKC 55 section deals with relay chattering, program loss on power cycle, and communication issues with AK2 modules. Solutions include changing comm timing and replacing batteries.
For the AKC 164, sensor failure status is discussed, often pointing to KVQ valve issues.
Finally, the AKA 65 section covers "Invalid License" and "Unable to locate compatible Win55" errors, providing steps for administrative permissions, software reinstallation, and file placement. Connectivity issues, such as being unable to fully connect remotely or direct connect locally, are also detailed, with instructions for verifying site setup, controller addresses, and PC/255 IP settings.
The guide is structured to facilitate quick and efficient troubleshooting. Each problem is clearly identified with a heading, followed by a numbered list of diagnostic steps and potential solutions. This format allows users to systematically work through issues, from basic checks to more complex system configurations.
For instance, when a compressor issue arises, the user is directed to check the rack status screen first, then settings for staging patterns, and finally address configurations. This logical flow helps narrow down the problem efficiently. The guide also highlights common mistakes, such as incorrect parameter settings for AK-CC 550A, providing specific values (e.g., 061=2) to verify.
The inclusion of recommendations, such as using "Show only scanned devices" to limit choices or updating firmware, helps users optimize their troubleshooting process and ensure they are working with the most current system configurations. For network issues, the guide emphasizes point-to-point daisy chain wiring and correct cable types, which are crucial for stable communication.
While primarily a troubleshooting guide, several sections touch upon maintenance-related activities. Battery replacement for the AK-SC 255 and AKC 55 is detailed, providing instructions to ensure continuous operation and prevent program loss. The guide also implicitly supports preventive maintenance by encouraging regular checks of firmware versions and network configurations, which can prevent future issues.
The emphasis on verifying wiring, addressing, and sensor accuracy serves as a maintenance checklist, ensuring that all components are correctly installed and functioning. For example, checking for hairline shorts on comm loop terminals or ensuring EOL resistors are in place are critical maintenance checks that prevent communication failures. The guide also advises on isolating loops in sections to identify where communication problems are introduced, a valuable technique for systematic maintenance and repair.
The instructions for updating system managers to the latest firmware versions are also a key maintenance activity, ensuring that controllers benefit from the most recent bug fixes and performance enhancements. By following the steps for replacing controllers like the AK-CC 750, users can perform necessary hardware maintenance to keep the system operational.
Overall, the Danfoss troubleshooting guide is an indispensable resource for anyone managing Danfoss supermarket electronics, offering clear, actionable steps for diagnosing and resolving a wide array of technical issues, thereby contributing to the longevity and reliability of the equipment.
General| Protection Class | IP20 |
|---|---|
| Housing Material | Plastic |
| Supply voltage | 24 V DC |
| Communication | RS-485 |
| Input Voltage | 24 V DC |
| Output Voltage | 24 V DC |
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