Ulvac EMP-20W, Instruction Manual

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34 ULVAC CRYOGENICS INCORPORATED
Problem Possible Cause Corrective Action
(5) COMP.AL lights on, and
the liquefaction does not
start.
(RUN/STOP button
starts to blink.)
Power supply is connected
with reverse phase. Turn OFF the main power
source, and alternate two
cables out of three.
The voltage is lowered and
power supply fell short as
multiple devices run
simultaneously with one power
source. Engage one power source per
one device. Fix the power
supply to meet the specified
value when it is not sufficient.
Cooling water supply is being
suspended. Check the pressure and flow
rate of cooling water and
adjust them to the normal
range. After adjusting, press
RESET button of EMP-20W to
restart.
The ambient temperature is too
high. Ventilate well around
EMP-20W.
Keep the ambient temperature
below 35
°C by installing
fans or air conditioners.
(5) COMP.AL lights on, and
the liquefaction does not
start.
(RUN/STOP button
starts to blink.)
Electric parts of UW404 break
down. Please contact us.
Helium charge pressure of
UW404 is lower than
specified.
Charge helium gas to the
specified pressure of UW404.
Contact us for more
information on charging.
(6)RUN/STOP blinks and
EMP does not start
liquefying operation
(Alarm light is not lit).
Less than 6 minutes have
passed since RUN/STOP
switch is pressed.
Wait for 6 minutes until GN2
is filled from GN-15i.
Condensation occurs in the
level sensor of EMP-20W.
Check the connection between
EMP-20W and nitrogen
generator, and also check flow
rate or nitrogen gas.
The level sensor needs to be
dried. Please contact us.
Level sensor of EMP-20W is
damaged.
Please contact us.
(7)Liquid Nitrogen cannot
be dispensed.
No liquid nitrogen such as at
the time of initial start-up.
(LN2 amount is displayed as
0 %)
Please wait until liquid
nitrogen is accumulated.
Level sensor malfunctions due
to ice or frost in the dewar.
Please contact us..