Some difficulties may occur while operating the electric machine. Possible causes and actions are
given in 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.
Contact Danfoss for more information.
Table 10. Troubleshooting chart
Symptom
Possible cause
Action
Excessive vibration, noise
Unbalance at the connected
machine or the powertrain
components.
Check the balance and installation of the actuator and drivetrain components.
Misalignment between the
electric machine and the used
device.
Check the connections and couplings.
Attachment bolts are loose.
Replace and tighten the bolts.
Clearance at the spline
connection.
Check the spline connection.
Imbalance at the electric
machine.
Contact Danfoss.
Particles inside the electric
machine.
Bearing damage.
Inadequate lubrication
(electric machine with BHS
option).
Apply bearing lubricant/grease. See Chapter
Bearings and lubrication
. Contact
Danfoss for further information.
Bearing temperature rise
Inadequate lubrication
(electric machine with BHS
option).
Apply bearing lubricant/grease. See Chapter
Bearings and lubrication
.
Too much grease at the
bearing housing (electric
machine with BHS option).
Open grease escape valve and let the electric machine run for 10 min. Clean the
grease escape channel from solidi ed grease using brush if necessary.
Incorrect bearing grease.
Check that the used grease is of correct type.
Incorrect radial lip seal.
Check that the correct type of radial lip seal is used.
Overloaded bearing.
Check that the system is not causing excess force or vibration to the machine
bearings.
Bearing damage.
Contact Danfoss for further information.
Electric machine
overheating
Overload.
Reduce load. Check the electric machine model description and rating plate,
check the inverter limits.
Cooling system failure.
Check the cooling system integrity, ow and uid temperature.
Change the cooling ow direction to ush the cooling system from sediment
possibly accumulated. See Chapter
Emergency operation
.
Leakage in the cooling system. Check the cooling system circuit and connections.
Rigid particle inside the
machine cooling channel.
Try pulsating coolant to open the channels. Contact Danfoss.
Wrong machine parameters in
the inverter.
Check and correct the machine parameters from the inverter.
Winding short circuit.
Replace the electric machine.
EM-PMI540-T1500
10. Troubleshooting
| BC265856800806en-000106
©
Danfoss | Produced By: Danfoss Power Solutions | January 2019 | 55
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