User manual

Service Monitor User Manual
Danfoss Turbocor Compressors Inc. 31
ECD-00007M Rev. 1
NOTE:
A motor alarm will slow down the motor, whereas a motor
fault will trip the motor.
6.5 Magnetic Bearing Monitoring
6.5.1 Bearing Monitoring Overview
The “Magnetic Bearing Monitoring” window allows the
user to:
• Change the shaft levitation state
• View the shaft unbalance percentage
• View the current required to counteract the shaft
unbalance
• View bearing faults and alarms
To view the “Magnetic Bearing Monitoring” window, select
“Window”→ “Bearing” from the menu bar, or click on the
“Magnetic Bearings” icon located below the menu bar.
Table 10 provides a description of the bearing monitoring
parameters.
IMPORTANT:
To change a parameter setting, double-click the variable
field, scroll or type in the new setting, and press Enter. It is
important to press Enter as this causes the user input to be
validated.
Table 9 Motor Faults and Alarms
Fault / Alarm Possible Cause
Motor Single Phase Over-Current
Detected
Excess liquid at the suction valve, thus causing the motor to
overwork and generate too much current.
DC Bus Over-Voltage Detected DC bus voltage exceeds acceptable voltage range.
Motor High Current Warning The AC input voltage is too low, or the compressor is overloaded
(due to wet gas or exceeded compressor capacity).
Motor High Current Fault The AC input voltage is too low, or the compressor is overloaded
(due to wet gas or exceeded compressor capacity).
Inverter Error Signal Faulty IGBT Inverter
Over-Current During Startup - Rotor
May Be Locked
Too much current output to the shaft (rotor) during compressor
start-up.
Bearing Warning Active The shaft is out of orbit, the compressor communication is affected
by noise, or there is excessive compressor load.
Bearing Error Active Shaft is blocked or the bearings are faulty.
Output voltage on the motor Faulty IGBT Inverter.
Soft Start Error Detected Faulty Soft Start Controller.
24Vdc Fault Faulty 24VDC supply.
Motor back EMF is low. Motor magnet strength is weak, possibly caused by insufficient
motor cooling.
EEPROM checksum error. Faulty BMCC.
Generator mode active Compressor is coasting down due to loss of power supply.
SCR phase loss Excessive imbalance may exist between the phases.