s
Product documentation 1D
3.8.
en
Rev. E, 10/13
page 34/42
4.5.2
Electric causes I
Breakdown
Possible cause
Remedy precaution
Ge
n
er
at
o
r vo
lt
ag
e < U
N
U
N
ca
nno
t b
e s
et
b
y me
ans
o
f p
o
te
nci
o
me
te
r V
O
LT
Ge
n
er
ato
r v
ol
tag
e app.
0
,1
U
N
(
re
ma
ne
nt
v
o
lt
ag
e)
G
en
er
at
or
v
ol
ta
g
e
>
1,
1 U
N
ca
nno
t b
e s
et
b
y me
ans
o
f
co
nt
ro
l d
ev
ice
Out
sid
e c
o
n
tr
o
l d
ev
ic
e
w
it
h no
f
u
nct
io
n
Cur
re
n
t a
n
d v
o
lt
age
dr
if
tin
g
•
Too high number of speeds
Check speeds of drive
•
Too low number of speeds
Check speeds of drive
•
Oscillation of number of speeds
Check speeds of drive
•
•
Defect on rotating rectifier
Check diodes, exchange diode
module
•
Defective varistor or diodes
Exchange varistor or diodes
•
Break in circuit
Check wires
•
Break in regulator feeding
Check wires from auxiliary
winding to regulator
•
Defect on fuse F1
Exchange fuse
•
Break in exciting circuit
Check wires from regulator to
exciter
•
•
•
Defective voltage regulator
Exchange regulator
•
Stability potentiometer reset
New adjustment of
potentiometer, stability according
to operational instructions of
regulator
•
Frequency potentiometer reset
New adjustment of
potentiometer, frequency
according to operational
instructions of regulator
•
Breakdown in circuit of planned
values, short-circuit in leads
Eliminate short-circuit
•
•
Breakdown in circuit of planned
values, interruption in leads
Eliminate interruption
•
During operation of
potentiometer of planned
values bridge is missing
Input bridge or attach external
potentiometer with planned
value
Tab. 10 Electric causes I
