CBS S1500 - Troubleshooting

■ **HIGH ALARM** text
is flashing and audible
alarm is present
(screen #90 on page 17)
*Liquid level in the vessel
has risen above the HIGH
level setpoint
■ **LOW ALARM** text
is flashing and audible
alarm is present
(screen #90 on page 17)
*Liquid level in the vessel
has fallen below the
LOW level setpoint
35
** **
LIQUID LEVEL XX.XCM LID TEMP.-XXX C
SYSTEM STATUS HIGH ALARM
FILL/START FILL/STOP MUTE REPORT
o
** **
HIGH ALARM
** **
LIQUID LEVEL XX.XCM LID TEMP.-XXX C
SYSTEM STATUS LOW ALARM
FILL/START FILL/STOP MUTE REPORT
o
** **
LOW ALARM
- Troubleshooting Guide: Alarms -
• Check to see if unit is filling:
- If unit is filling:
- If unit is not filling:
• Supply tank is empty
• Supply tank is shut off
• Supply tank pressure is too
low
• 3 or more storage units
are filling at one time from
a single supply line
• Push the STOP switch, if fill
continues the solenoid valve
may be frozen open; push
the FILL and STOP switches
15 to 20 times to unstick the
valve. If the fill continues turn
off manual valve on the liquid
nitrogen supply tank and let
the solenoid valve warm to
room temperature, then
reopen manual valve to see
if proper operation returns.
If not, solenoid valve may
need to be disassembled for
service (see page 40 -
Cleaning and Maintenance)
• There may be an obstruction
in the solenoid valve. Remove
solenoid valve and disassemble
for service (see page 40 -
Cleaning and Maintenance)
• Replace supply tank
• Open manual valve on
supply tank
• Check pressure in supply
tank - 22 p.s.i. maximum,
18 p.s.i. minimum
• Storage vessels will fill very
slowly and alarm will correct
itself.
Continued on next page
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CONDITIONS
CAUSES
SOLUTIONS