SEW-Eurodrive DR 315 Series, Operating Instructions Manual

Page: 228 / 268

9
Malfunctions
Motor malfunctions
Operating Instructions – AC Motors
228
Fault Possible cause Measure
Severe speed loss un-
der load Motor overload Measure power, check project planning and
use larger motor or reduce load if necessary
Voltage drops Check cross section of supply cable, replace
with cable of larger cross section if necessary
Motor heats up excess-
ively (measure temper-
ature) Overload Measure power, check project planning and
use larger motor or reduce load if necessary
Insufficient cooling Provide for cooling air supply or clear cooling
air passages, retrofit forced cooling fan if ne-
cessary. Check the air filter, clean or replace if
necessary
Ambient temperature too high Observe the permitted temperature range, re-
duce the load if necessary
Motor in delta connection instead
of star connection as intended Correct the wiring, observe the wiring diagram
Loose contact in supply cable (one
phase missing) Tighten loose contact, check connections, ob-
serve wiring diagram
Fuse defective Look for and rectify cause; replace fuse
Line voltage deviates from the
rated motor voltage by more than
5% (range A) / 10% (range B). Adjust motor to line voltage
Operating mode (S1 to S10,
DIN 57530) exceeded, e.g. caused
by excessive switching frequency Adjust the operating mode of the motor to the
required operating conditions; consult a pro-
fessional to determine the proper drive, if ne-
cessary
Loud noises Ball bearing compressed, dirty or
damaged Re-align motor and the driven machine, in-
spect rolling bearing and replace if necessary
Vibration of rotating parts Look for the case, possibly an imbalance; cor-
rect the cause, observe method for balancing
Foreign bodies in cooling air ducts Clean the cooling air ducts
For DR.. motors with rotor desig-
nation "J": Load too high Reduce the load
25851535/EN – 02/2019