DONATI SOLLEVAMENTI S.r.l. - Via Quasimodo,17 - 20025 Legnano (MI) - Tel. 0331 14811 - E: [email protected]
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6.7.2 Malfunctions on components and possible solutions
•
Primary causes of malfunctions on individual parts, and possible solutions.
PROBLEM
POSSIBLE CAUSES
POSSIBLE SOLUTIONS
Brake skidding
* brake lining wear
* presence of oil/grease
* set the play or replace the lining
* clean the lining
Brake overheating
* incorrect operation
* unsuitable environmental conditions
* incorrect setting
* reset normal operating conditions
* adjust the brake
Brake not releasing
* incorrect power supply
* incorrect setting
* reset voltage values
* adjust the brake
Brake tends to jam up
* unsuitable environmental conditions
* inappropriate operation
* reset normal operating conditions
Limit switch is blocked
on opening, does not
reset
* activation head clogged
* incorrect confirmation
* interrupted connections
* clean and reset correct operating
conditions
Motor too hot
* variation in voltage > 10%
* poor cooling
* ambient temperature > foreseen
* use does not conform to service
operation foreseen
* ensure correct line voltage
* reset correct air circulation
* adapt motor specifications
* adapt service conditions to normal
Motor won’t start
* burnt fuse
* power malfunction
* overload, burnt out due to high start-
up frequencies, insufficient
protection
* replace the fuse
* check contactor/power cable
* rewind the motor and ensure better
protection
* check the control device
Motor doesn’t start up
easily
* on start-up the tension or frequency
decrease with respect to the nominal
value
* improve line or power supply conditions
Motor buzzes and
absorbs too much
current
* defective winding
* one power phase missing
* reducer blocked
* brake blocked
* short circuit on power supply
* short circuit on motor
* proceed with repairs
* check power cable and/or contactor
* request a specialized technician
* check and if necessary set the brake
* eliminate the short circuit
* request a specialized technician
Motor short circuiting
* malfunction in winding
* re-wind up the motor
6.7.3 Personnel authorized to intervene in case of malfunctions
•
Personnel authorized to intervene in cases of malfunctions, where not notified otherwise, are expert
maintenance staff with specific training on mechanical and electrical parts.
•
Where specifically indicated otherwise, on the other hand, the intervention of specialized servicing personnel for
DONATI SOLLEVAMENTI S.r.l.
or its authorized personnel is required.
6.7.4 Disabling the units
•
Should the
“DGT”
drive units
or
endcarriages
no longer be repairable, proceed with disabling them,
requesting the intervention of specialized servicing personnel for
DONATI SOLLEVAMENTI S.r.l.
, notifying the
type of malfunction.
