Danfoss FC302 AC Drives Programming Guide

An earth (ground) fault has been detected, indicating an unintended current path from a phase conductor to the ground. This usually points to damaged insulation in the motor windings or associated cabling, posing a significant safety hazard and a risk of severe damage to the drive or compressor components.

This fault indicates that the W phase supply to the motor is not being detected by the drive. This condition prevents the motor from starting or running properly, and continued operation could lead to motor damage due to unbalanced phases or a complete system shutdown.

A power shortage or interruption occurred in the main power supply while the compressor was running, leading to an unexpected loss of power to the unit. This can result in system disruption, unexpected shutdowns, and potential data loss if not properly addressed. It prevents consistent operation of the unit.

An internal fault has been detected within the drive itself, indicating a potential hardware or software malfunction that prevents the drive from operating correctly. This type of fault requires internal diagnosis and, if left unresolved, risks further damage to the drive or complete system failure.

This alarm indicates a potential issue related to the compressor. The manual suggests it might not be a direct compressor or drive failure itself but a symptom of another problem, requiring further investigation to determine the root cause. This fault prevents the system from operating correctly.

The system has initiated a safe stop due to the High Pressure (HP) switch tripping. This indicates that the system's internal pressure has exceeded its safe operating limits, triggering a protective shutdown to prevent damage to the compressor or other components within the refrigeration circuit. The system will not operate until this condition is cleared.