Danfoss Turbocor TT Series, Service Manual, Page: 253 / 294

Table 5-3 Compressor Status 2 Faults
Compressor Status 2 Fault Description
Suction Pressure Sensor Fault
Sensor errors occur when the sensor is providing a reading that is outside the normal readable range
and indicates an error in the reading, or a functional problem with the sensor. - only available in 4.X
Suction Temperature Sensor
Fault
Discharge Pressure Sensor Fault
Discharge Temperature Sensor
Fault
Inverter Temperature Sensor
Fault
Cavity Temperature Sensor Fault
Soft Start Temperature Sensor
Fault
Invalid Bearing Calibration Fault A valid bearing calibration is not stored in the EEPROM.
Inverter Cooling Control Fault The measured Inverter Temperature has exceeded the Cooling Control Fault limit after the Fault Delay timer has
expired. If the temperature rises above the fault limit, the fault delay timer will begin, if the temperature falls
below the fault limit, the timer will be reset, the compressor will stop if the timer expires.
Motor Cooling Control Fault The measured Cavity Temperature has exceeded the Cooling Control Fault limit after the Fault Delay timer has
expired. If the temperature rises above the fault limit, the fault delay timer will begin, if the temperature falls
below the fault limit, the timer will be reset, the compressor will stop if the timer expires.
Table 5-4 Motor Fault Types
Motor/System Status Description
Motor Single Phase Overcurrent
Fault Measured peak current value of any single phase to motor (from Inverter) exceeds the fault limit.
DC Bus Overvoltage Fault The measured DC bus voltage has exceeded the Maximum DC Bus Voltage limit, while RPM is >0
Motor High Current Fault The motor current has exceeded Maximum Motor Current limit.
Inverter Error Inverter reports a generic error, or communication to BMCC is lost.
Bearing Fault Active If a Bearing Status Fault type is present, then the Bearing Fault Active is triggered. This is not an actual fault, only
an indication that a fault has occurred in the Bearing Status section.
Rotor Starting Torque Fault Motor Current maximum has been exceeded during compressor start-up.
Low Inverter Current Fault Measured current to motor (from Inverter) has not reached the Minimum Power limit.
DC Bus Under/Over Voltage
Fault At 0 RPM: The measured DC Bus voltage is measured lower or higher than the DC Bus Under or Over Voltage Fault
limits.
24VDC Under/Over Voltage
Fault The measured 24VDC supply is outside the range of the low or high limit.
Low Motor Back EMF Fault The calculated motor back EMF has fallen below the minimum Back EMF limit.
EEPROM Checksum Fault An error (checksum error) occurs reading the data table from the EEPROM.
Generator Mode Active At greater than 0 RPM and DC bus voltage low, Generator mode is enabled, switching the Inverter to rectifier
function to maintain the DC bus voltage until the shaft comes to a stop and delevitates.
SCR Ripple Voltage Fault The DC bus voltage ripple exceeds the SCR Voltage Ripple Fault limit.
System in Startup mode The compressor initialization has not finished. Please wait. Compressor is resetting after a power cycle. This is a
status message.
M-SV-001-EN Rev. H-1/23/2023 Page 253 of 294