ULVAC CRYOGENICS INCORPORATED
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8.2.2
Start liquid nitrogen production
(1) As nitrogen gas supply starts normally, the RUN/STOP switch lights green and
SA115-C starts up, which means the start of liquid nitrogen production.
If the production does not start and the COMP.AL. illuminates, the power supply
may be connected with reverse phase. In such a case, turn OFF the breakers of
main power source and the electric circuit of EMP-14A, replace 2 cables out of 3
on the main power source, and turn on the power again.
(2) At the time of initial startup, inside of the dewar is at room temperature and the
time to cooldown is required. (It normally takes about half a day.) When the
dewar is sufficiently cooled down, liquid nitrogen begins to be accumulated.
The production continues until liquid nitrogen reaches 40 litters (100%). After
that, production starts when the amount of liquid nitrogen in the dewar is below
30litters (75%), and stops when it reaches to 100%.
8.3 Shutdown
When EMP-14A is turned OFF with the RUN/STOP button, the RUN/STOP light
flashes with shorter illumination and longer off for 10 seconds, and all the
operations stop including LN
2
production, nitrogen gas supply. The RUN/STOP
button lights off.
8.4 When resuming EMP-14A after suspending for 1 or 2 weeks
(For the system with GN-10i)
(1) Remove the remote cable from GN-10i before pressing the RUN/STOP switch
of EMP-14A, and remove the panel on the right side of GN-10i.
(2) Unplug the jumper connector located on the terminal block (1 and 2 of TB2)
inside GN-10i.
(3) Press the button on the front of GN-10i to startup and keep supplying nitrogen
gas to EMP-14A for at least one hour.
(4) Stop GN-10i, connect the jumper connector located on the terminal block (1
and 2 of TB2), and attach the remote cable for nitrogen gas generator and
CAUTION
When the system is suspended operation for a long time, liquid nitrogen in the dewar will
be replaced by the air. If the equipment is resumed with such condition, the LN
2
production efficiency deteriorates due to the moisture in the air. Follow the procedure
below to resume.