Carrier SUPRA 950Mt - Page 43

2-31
a.
Regist
ered
fault
R
e
g
i
s
t
e
r
e
d
f
a
u
l
t
I
n
i
t
i
a
l
c
a
u
s
e
o
f
f
a
u
l
t
A
c
t
i
o
n
t
o
b
e
t
a
k
e
n
Fault finding parts to
be checked
-
-
Without load
Loss of residual magnetism.
Apply
a
battery
4.5V
to
capac
itor
termina
ls.
Lo
ad
the
al
te
rna
to
r
an
d
ru
n
en
gi
ne
ab
ov
e
nominal speed for a few seconds.
No
vo
lta
ge
wi
th
no
D
e
f
e
c
t
i
v
e
c
a
p
a
c
i
t
o
r
.
C
h
a
n
g
e
t
h
e
c
a
p
a
c
i
t
o
r
.
load when
starting
.
Rotor diode out of order or short circuit.
Chang
e the
2 di
odes
on the
rotor o
r cha
nge
the generator.
Winding short circuit or loose
connections.
Check the resistance of coils. (see b.
Generato
r
chapte
r
2.5)
Voltage with no load
Speed of engine
too low
.
Check
the
speed
range
of
the
engin
e
and
the
motor AC.
l
e
s
s
th
a
n
8
0
%
o
f
nominal voltage.
1
rotor
diode
out
of
order
or
short
circui
t.
Partiel short circuit
in winding.
Change the 2 diodes on the rotor short circuit.
Check the resistance of the coils.
Too high voltage
without load.
Speed
of
engin
e
too
high.
Check
the
speed
range
of
the
engin
e
and
the
motor AC.
Fault finding parts to
be checked
-
-
With load
No
vo
lt
ag
e
1
ro
to
r
di
od
e
sh
or
t
ci
rc
ui
t
or
ou
t
of
or
de
r
.
Ch
an
ge
th
e
2
di
od
es
on
th
e
ro
to
r
.
Correct voltage
without load, low
voltag
e
with load.
The speeds engine falls off.
Eit
he
r
,
ch
ec
k
va
lu
e
of
lo
ad
,
or
co
nta
ct
the
engine specialist.
Excessive heat
(over heating)
V
en
til
ato
r
ho
le
s
pa
rti
al
ly
bl
oc
ke
d.
Di
sm
an
tle
an
d
cl
ea
n
the
sta
tor
.
b.
Disas
sembly
phase
-
Unscrew the fixing bolts of the stator frame to
the flange.
-
Unscrew the 3 screws of the rear cover and
dismantle it.
-
 T
ake
out
with
han
dli
ng
pre
cau
tion
the
roto
r
assem
bly of
the housing.
c.
Control of the capa
citors (i
n the control box)
-
Measu
re the
value with a capacitance meter
.
-
Capacitors values for the tests:
2 capacitors 8
µ
F
(
¦
5%) for 950Mt
_
versions
2 capacitors 6
µ
F
(
¦
5%) for
750/85
0Mt
_
versions
CAPACITANCE METER
CAPACITORS
-
If you do not use capacitance meter, use
multimeter and see as opposite:
MULTIMETER
CAPACITORS
220V/50HZ
240V/60HZ
SWITCH
Ver
sions
750Mt
950Mt
2
2
0
V
/
5
0
H
Z
0
.
4
1
A
0
.
5
5
A
2
4
0
V
/
6
0
H
Z
0
.
5
4
A
0
.
7
2
A
d.
Ve
rific
ation of diodes (Qty: 2)
OHMETER
DIODES
/850Mt