Thermo Scientific 7400 Series, Руководство по эксплуатации и техническому обслуживанию

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3-10 7007400 Cryoplus Thermo Scientific
Section 3
Troubleshooting the Alarms
Level
Sensor
Fill
V
alve
Bypass
V
alve
Open V
alve
Bypass Sensor
LN
Source
2
Silence
B
ypass
Sensor
warning
lamp
and
the
alarm
bars
light.
The
audible
alarm
sounds.
The
R
emote
alarm
contacts
set
to
activ
ate
in
30
minutes.
The
Alarm
system
resets
if
the
condition
corr
ects.
When
the
system
recogniz
es
a
b
ypass
cir
cuit
failur
e,
it
will
not
open
the
B
ypass
V
alv
e
and
The
system
does
not
detect
that
the
sensor
is
connected
or
operating.
W
ir
es
may
be
cut
or
br
oken.
The
electrical
connector
may
be
unplugged
fr
om
the
cir
cuit
boar
d
(F
igur
e
3-2).
Check
all
wiring
for
cuts
or
br
eaks.
V
erify
that
the
sensor
connector
is
secur
e
on
the
cir
cuit
boar
d
(F
igur
e
3-2).
The
alarm
is
clear
ed
b
y
turning
the
key
switch
to
F
ull
A
ccess
and
back
to
Lock.
The
system
will
go
into
the
alarm
state
the
next
time
an
LN2
fill
command
is
issued
if
the
b
ypass
fault
is
not
corr
ected.
If
the
alarm
state
cannot
be
corr
ected,
call
the
T
echnical
Ser
vices
D
epar
tment.
13
alarm2a.cdr
Front
Panel
Alarm
Alarm
Description
and
Probable
Cause
System
Response
Printer
Error Code
Corrective
Action
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.
Level
Sensor
Fill
V
alve
Bypass
V
alve
Open V
alve
Bypass
Sensor
LN
Source
2
Silence
All
warning
lamps
light.
System
will
not
operate.
P
rinter
prints
E
rr
or
Code
14.
The
micr
opr
ocessor
sees
a
cir
cuit
boar
d
fault
on
initial
po
w
er
up
and
the
sum
check
is
wr
ong.
T
urn
the
system
off
for
fiv
e
to
ten
minutes,
then
turn
it
back
on.
The
system
should
reset
b
y
restoring
default
limits.
If
system
does
not
self-corr
ect,
call
the
T
echnical
Ser
vices
D
epar
tment.
14