Fault repair
31.10.2002 \\Docuserver\ba\Master\Ba_eng\UM\044_60\UM_A+S\Trouble.fm 22
VCM 44
8. Fault repair
8.1 Faults in the drive motors
All repair work is only to be carried out by the appropriately trained specialists, who
should observe both the general and specific accident prevention regulations.
This particularly applies to all electrical work referred to in the following fault repair
tables.
(See “5. Maintenance and repair, colored safety instructions iii)
Faults Possible reasons Repair
Motor will not start Supply is not connected or wrongly connect-
ed, e.g., a loose contact
Check voltage across supply and cor-
rect. Remedy loose contact.
Fuse has blown install new fuse (of correct rating).
Motor protector has operated Allow motor to cool,
switch on motor protector
check motor protector settings.
Motor protector will not switch. Control is
faulty
call in specialists to test and repair.
Motor starts with difficul-
ty
Motor is designed for delta connection but is
star connected
Check and correct the control of motor
protector.
Voltage or frequency vary greatly from nom-
inal values, at least on starting.
(See ” Machine Data” on page 9.)
Correct switching.
Fuses blow or the motor
protector cuts out imme-
diately
Winding is faulty Motor must be sent for repair
Short circuit in motor or wiring Remove short circuit
Motor has short to frame or interturn short
circuit
call in specialists to test and repair.
Motor runs in wrong di-
rection
Motor is wrongly connected.
(See ” Rotational direction check” on page
11.)
Exchange phases.
Motor is wrongly switched. call in specialists to test and repair.
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