Siemens 5-GMI-250 - Page 41

Maintenance
&
Overhaul
Page
38
Troubleshooting
Possible
Causes
&
Remedies
Symptoms
Problem
Closing
springs
will
not
automatically
charge
.
1
.
Secondary
control
circuit
is
de
-
ener
-
gized
or
control
circuit
fuses
are
blown
.
Check
and
energize
or
replace
if
necessary
.
2
.
Secondary
disconnect
contacts
15
or
16
are
not
engaging
.
Check
and
replace
if
required
.
3
.
Damage
to
wiring
,
terminals
or
con
-
nectors
.
Check
and
repair
as
neces
-
sary
.
4
.
Failure
of
charging
motor
(
88
)
.
Check
brushes
and
replace
if
re
-
quired
.
5
.
Motor
cut
-
off
switch
(
LSt
)
fails
to
operate
.
Replace
if
necessary
.
6
.
Mechanical
failure
of
closing
springs
or
tie
-
bar
assembly
Check
and
replace
as
required
.
7
.
Mechanical
failure
of
operating
mechanism
.
Refer
to
factory
or
authorized
service
shop
Breaker
fails
to
close
«
Closing
springs
charge
,
but
breaker
does
not
close
.
•
Closing
coil
,
or
solenoid
(
52
SRC
)
fails
to
energize
.
No
sound
of
breaker
closing
.
1
.
Secondary
control
circuit
de
-
ener
-
gized
,
or
control
circuit
fuses
blown
.
Correct
as
indicated
.
2
.
No
closing
signal
to
secondary
dis
-
connect
pin
13
.
Check
for
con
-
tinuity
and
correct
relay
logic
.
3
.
Secondary
disconnect
contacts
13
or
15
are
not
engaging
.
Check
and
correct
as
required
.
4
.
Failure
of
anti
-
pump
relay
(
52
Y
)
con
-
tacts
21
-
22
or
31
-
32
or
13
-
14
.
Check
and
replace
as
required
.
5
.
Failure
of
dose
coil
(
solenoid
)
(
52
SRC
)
.
Check
and
replace
as
re
-
quired
.
«
Courtesy of NationalSwitchgear.com