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4.5.2 Electric causes I
Breakdown
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Product documentation 1D 3.8.en
Possible cause
Too high number of speeds
Too low number of speeds
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Oscillation of number of speeds
Defect on rotating rectifier
Defective varistor or diodes
Break in circuit
Break in regulator feeding
Defect on fuse F1
Break in exciting circuit
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Defective voltage regulator
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Stability potentiometer reset
Frequency potentiometer reset
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Breakdown in circuit of planned
values, short-circuit in leads
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Breakdown in circuit of planned
values, interruption in leads
During operation of
potentiometer of planned
values bridge is missing
Tab. 10 Electric causes I
Rev. E, 10/13
Remedy precaution
Check speeds of drive
Check speeds of drive
Check speeds of drive
Check diodes, exchange diode
module
Exchange varistor or diodes
Check wires
Check wires from auxiliary
winding to regulator
Exchange fuse
Check wires from regulator to
exciter
Exchange regulator
New adjustment of
potentiometer, stability according
to operational instructions of
regulator
New adjustment of
potentiometer, frequency
according to operational
instructions of regulator
Eliminate short-circuit
Eliminate interruption
Input bridge or attach external
potentiometer with planned
value
page 34/42
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