Some difficulties may occur while operating the electric machine. Possible causes and actions are given in
the Table below. If the situation occurs, it should be corrected as soon as possible. These instructions do
not cover all details or variations in the equipment nor provide information for every possible condition
to be met in connection with installation, operation or maintenance.
For more information, contact Danfoss service at
https://danfosseditron.zendesk.com/hc/en-gb
email to [email protected].
Troubleshooting chart
Symptom
Possible cause
Action
Excessive vibration, noise
Imbalance at the connected electric
machine or the powertrain
components.
Check the balance and installation of the drivetrain components.
Misalignment between the electric
machine and the used device.
Check the shaft connections and couplings. Ensure that the alignment is
within the specifications listed in Chapter
on page
22.
Attachment bolts are loose.
Replace and tighten the bolts.
Clearance at the spline connection.
Check the spline connection.
Imbalance at the electric machine.
Contact local Danfoss representative.
Particles inside the electric machine.
Bearing damage.
Inadequate lubrication (grease
lubricated bearings).
Apply bearing lubricant/grease. See Chapter
Contact local Danfoss representative for further information.
Bearing temperature rise
Inadequate lubrication (grease
lubricated bearings).
Apply bearing lubricant/grease. See Chapter
Too much grease in the bearing
housing (grease lubricated bearings).
Open grease escape valve and let the electric machine run for 10 min. Clean
the grease escape channel from solidified grease using brush if necessary.
Incorrect bearing grease.
Check that the used grease is of correct type.
Overloaded bearing.
Check that the system is not causing excess force or vibration to the machine
bearings. Check the alignment of the machine shaft, see Chapter
on page 22.
Bearing damage.
Contact local Danfoss representative for further information.
Incorrect mounting option
Check motor mounting orientation and confirm that the motor has the
correct option (vertical or horizontal mounting).
Electric machine overheating
Overload.
Reduce load. Check the machine rating plate and ensure that inverter limits
are set accordingly.
Cooling system failure.
Check the cooling system integrity, flow and fluid temperature.
Change the cooling flow direction to flush the cooling system from sediment
that has possibly accumulated. See also Chapter
.
Leakage in the cooling system.
Check the cooling system circuit and tighten the leaking connections.
Rigid particle inside the
machine cooling channel.
Try pulsating coolant to open the channels. Contact local Danfoss
representative.
Wrong machine parameters in the
inverter.
Check and correct the machine parameters in the inverter.
Damaged winding.
Measure the insulation resistance. Measure the winding resistance with a
high-precision DC resistance meter and compare to manufacturer
specifications. Replace the electric machine if necessary.
Inverter switching frequency too low. If other than a Danfoss Editron inverter is used, ensure that the switching
frequency is at least equal to the required minimum switching frequency of
the motor. See corresponding product data sheet.
User Guide
EM-PMI300-T310
Troubleshooting
58 |
©
Danfoss | April 2023
BC265858156812en-000202
