Thermo Scientific 7400 Series, Руководство по эксплуатации и техническому обслуживанию

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7007400 Cryoplus 3-7 Thermo Scientific
Section 3
Troubleshooting the Alarms
Front
Panel
Alarm
Alarm
Description
and
Probable
Cause
System
Response
Printer
Error
Code
Corrective
Action
LN
Sour
ce
warning
lamp
and
the
alarm
bars
light,
indicating
that
no
liquid
nitr
ogen
is
flo
wing
to
the
unit.
F
ill
and
B
ypass
valv
es
close.
The
audible
alarm
sounds.
The
remote
alarm
contacts
set
to
activ
ate
in
30
minutes.
This
alarm
will
ring
back
in
30
minutes
if
the
alarm
condition
is
not
corr
ected.
2
LN
lev
el
does
not
reach
the
setpoint
in
60
minutes.
P
rinter
prints
E
rr
or
Code
6.
2
The
B
ypass
Sensor
does
not
see
the
supply
line
temp
dr
op
belo
w
-130°C
in
60
minutes.
P
rinter
prints
E
rr
or
Code
8.
Listen
for
flo
w
of
gas
or
liquid.
Check
the
supply
tank
for
LN
.
R
evie
w
any
changes
or
conditions
which
may
hav
e
impact
on
the
system,
such
as:
Longer
hoses
or
pipes
installed.
F
lo
w
obstr
ucting
or
restricting
fittings
installed.
H
eat
emitting
sour
ce
mo
ved
to
pr
oximity
of
system.
2
N
ote:
An
LN
Sour
ce
Alarm
is
normally
a
LN
supply
pr
oblem
and
not
a
fault
of
the
C
ry
o
P
lus
Storage
System.
R
efer
to
Section
1.2
of
this
manual
and
make
sur
e
that
the
unit
is
receiving
nitr
ogen
and
not
just
nitr
ogen
.
22
liquid
gas
6 8
alarm1a.cdr
Level
Sensor
Fill
V
alve
Bypass
V
alve
Open
V
alve
Bypass Sensor
LN
Source
2
SilenceSilenceSilenceSilence
Setpoint
Red
LED's
and
The
audible
alarm
can
only
be
silenced
with
the
key
switch
in
the
Programming
Access
Position.
Return
the
key
switch
to
the
Lock
position
after
silence.
Alarms
do
not
ring
back
except
where
noted.
B
ypass
V
alv
e
warning
lamp
and
the
alarm
bars
light.
The
audible
alarm
sounds.
The
R
emote
alarm
contacts
set
to
activ
ate
in
30
minutes.
B
ypass
valv
e
closes.
P
rinter
prints
E
rr
or
Code
7.
The
system
does
not
detect
that
the
valv
e
is
connected
or
operating.
V
alv
e
coil
may
be
open.
W
ir
es
may
be
cut
or
br
oken.
.
The
electrical
connector
may
be
unplugged
fr
om
the
valv
e
or
fr
om
the
cir
cuit
boar
d.
(F
igur
es
Check
the
connectors
on
the
valv
e
and
on
the
cir
cuit
boar
d.
(F
igur
es
3-2
and
3-4)
Check
all
wiring
for
cuts
or
br
eaks.
Check
the
electrical
continuity
of
the
valv
e
coil.
If
the
alarm
state
cannot
be
corr
ected,
call
the
T
echnical
Ser
vices
D
epar
tment.
7
Level
Sensor
Fill
V
alve
Bypass
V
alve
Open V
alve
Bypass
Sensor
LN
Source
2
SilenceSilenceSilenceSilence