Operating Instructions – Explosion-Proof AC Motors – DRS/DRE/DRP 315
39
10
Customer service
Malfunctions
10.2 Customer service
Motor heats up excessively
(measure temperature)
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 pas-
sages, retrofit forced cooling fan if necessary. Check the
air filter, clean or replace if necessary
Ambient temperature is too high
Observe the permitted temperature range, reduce the
load if necessary
Motor in delta connection instead of star
connection as provided for
Correct the wiring, observe the wiring diagram
Loose contact in supply cable (one phase
missing)
Tighten loose contact, check connections, observe wiring
diagram
Fuse has blown
Look for and rectify cause (see above); replace fuse
Supply voltage deviates from the rated
motor voltage by more than 5% (range A)/
10% (range B).
Adjust motor to supply voltage.
Rated operation type (S1 to S10, DIN
57530) exceeded, e.g. through excessive
starting frequency
Adjust the rated operating mode of the motor to the
required operating conditions; consult a professional to
determine the correct drive if necessary
Excessively loud
Ball bearing compressed, dirty or damaged Re-align motor and the driven machine, inspect ball bear-
ing (see sec. "Permitted ball bearing types") and replace if
necessary
Vibration of rotating parts
Look for the case, possibly an imbalance; correct the
cause, observe method for balancing
Foreign bodies in cooling air passages
Clean the cooling air passages
Malfunctions
possible cause
Remedy
Please have the following information available if you require customer service assis-
tance:
•
Nameplate data (complete)
•
Type and extent of the problem
•
Time the problem occurred and any accompanying circumstances
•
Assumed cause
