Danfoss EM-PMI300-T310, User Manual

Page: 59 / 69

Troubleshooting chart (continued)
Symptom Possible cause Action
Connection box and / or motor
cables overheating
Cable lug bolts loose. Check torque of cable lug bolts. See also Chapter Power connections on page
33.
Cable diameter too small. Replace power cables with appropriate cable type.
Cable lug crimps insufficient or
incorrect.
Replace cable lugs. Use recommended cable lugs and crimping tools.
Contamination or insulating
substance between cable lug and
bus bar.
Check that the contact surfaces of the bus bars and cable lugs are clean and
undamaged. Ensure there is no grease, thread locking compound, dirt or
other foreign substances between the bus bar and cable lug.
Significant lubricant leak Worn radial lip seal. Contact local Danfoss representative.
Block at the grease outlet channel. Clean the grease escape channel from solidified grease using brush if
necessary.
Electric machine does not work
properly or the performance is
poor Wrong electric machine parameters
in the inverter. Check and correct the electric machine parameters from the inverter. See
inverter user manual and other relevant documentation.
Demagnetization of magnets due to
overheating. Check that the back-EMF of the motor is within specifications. Contact local
Danfoss representative. Replace the electric machine if necessary.
Bearing fault. Check the bearing temperature, lubrication and conditions. Contact local
Danfoss representative for further information.
Insulation or winding fault. Measure the insulation resistance, refer to the manufacturer limits. See
Chapter
Insulation resistance test . Measure the winding resistance with a
high-precision DC resistance meter and compare to manufacturer
specifications. Replace the electric machine if necessary.
Moisture and / or corrosion inside
the connection box or motor
Cable glands installed incorrectly. Check tightening torque and sealing of the cable glands.
Power cables installed incorrectly. Check cable installation and sealing with cable glands.
Connection box cover bolts are too
loose, too tight, or cover seal is
damaged.
Check the integrity of the seal on the connection box cover. Tighten the
cover bolts to the specified torque.
Low voltage connector damaged or
not connected.
Contact local Danfoss representative.
Breather cap blocked. Check that the breather cap of the electric machine is not submerged in
liquid, painted, or covered by any object
Anti-condensation heater failure The heater element is faulty. Measure the resistance of the heater element. See Chapter Anti-condensation
heater connections on page 46. If the heater is faulty, contact local Danfoss
representative.
Temperature measurement
failure The PT100 sensor is faulty. Measure the resistance of the PT100 sensor, see Chapter Low
voltage connections . If the sensor is faulty, read out the signal from another
sensor. Contact local Danfoss representative. See also Chapter Emergency
operation .
Resolver sensor failure Resolver wiring is faulty. Check the wiring of the resolver and make sure that a shielded and twisted
pair cable is used with the correct pairing of the signals.
Resolver sensor is damaged. Contact local Danfoss representative.
User Guide
EM-PMI300-T310
Troubleshooting
© Danfoss | April 2023 BC265858156812en-000202 | 59