Nilfisk-ALTO SR1800C B-D - Manual (Page 64)

USER MANUAL
14 33014817(2)2006-06 A
Motor overheating (SR 1800C B)
PROBLEM CAUSE REMEDY
Overload Current to the motor Subject the motor to less strain
Insufficient air flow Check suction/delivery openings Clean or change shields or caps
Fan rotation Replace fan
Wrong voltage Low battery voltage Recharge batteries
Low voltage to motor terminals Check connections for proper tightening
Bearings Faulty or badly installed bearing Change bearings or change at every repair
operation
Radial overload Check stress and strain
Dirt infiltration Clean the motor inside
Winding heating Armature with shorted blackened winding Replace. Use only original spares. Do not
rewind.
High humidity Clean and dry at 110°C
Shorted coil or winding, blackened insulating
material Replace. Use only original spares.
Loose inner connection Check and tighten correctly
Commutator heating Short-circuit between segments Clean commutator and contact the
manufacturer
Poor contact or worn carbon brushes Check or replace
Improper carbon brush quality Only original carbon brush and for 48 V
voltages
Excessive spring pressure Recalibrate or change
Dirty or damaged surface Clean or rectify the commutator